456 lines
13 KiB
LLVM
456 lines
13 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -S < %s -passes=instcombine | FileCheck %s
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target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64"
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target triple = "x86_64-apple-macosx10.7.0"
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; Check transforms involving atomic operations
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define i32 @test1(ptr %p) {
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; CHECK-LABEL: @test1(
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; CHECK-NEXT: [[X:%.*]] = load atomic i32, ptr [[P:%.*]] seq_cst, align 4
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; CHECK-NEXT: [[Z:%.*]] = shl i32 [[X]], 1
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; CHECK-NEXT: ret i32 [[Z]]
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;
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%x = load atomic i32, ptr %p seq_cst, align 4
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%y = load i32, ptr %p, align 4
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%z = add i32 %x, %y
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ret i32 %z
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}
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define i32 @test2(ptr %p) {
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; CHECK-LABEL: @test2(
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; CHECK-NEXT: [[X:%.*]] = load volatile i32, ptr [[P:%.*]], align 4
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; CHECK-NEXT: [[Y:%.*]] = load volatile i32, ptr [[P]], align 4
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; CHECK-NEXT: [[Z:%.*]] = add i32 [[X]], [[Y]]
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; CHECK-NEXT: ret i32 [[Z]]
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;
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%x = load volatile i32, ptr %p, align 4
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%y = load volatile i32, ptr %p, align 4
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%z = add i32 %x, %y
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ret i32 %z
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}
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; The exact semantics of mixing volatile and non-volatile on the same
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; memory location are a bit unclear, but conservatively, we know we don't
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; want to remove the volatile.
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define i32 @test3(ptr %p) {
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; CHECK-LABEL: @test3(
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; CHECK-NEXT: [[X:%.*]] = load volatile i32, ptr [[P:%.*]], align 4
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; CHECK-NEXT: [[Z:%.*]] = shl i32 [[X]], 1
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; CHECK-NEXT: ret i32 [[Z]]
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;
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%x = load volatile i32, ptr %p, align 4
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%y = load i32, ptr %p, align 4
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%z = add i32 %x, %y
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ret i32 %z
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}
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; Forwarding from a stronger ordered atomic is fine
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define i32 @test4(ptr %p) {
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; CHECK-LABEL: @test4(
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; CHECK-NEXT: [[X:%.*]] = load atomic i32, ptr [[P:%.*]] seq_cst, align 4
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; CHECK-NEXT: [[Z:%.*]] = shl i32 [[X]], 1
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; CHECK-NEXT: ret i32 [[Z]]
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;
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%x = load atomic i32, ptr %p seq_cst, align 4
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%y = load atomic i32, ptr %p unordered, align 4
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%z = add i32 %x, %y
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ret i32 %z
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}
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; Forwarding from a non-atomic is not. (The earlier load
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; could in priciple be promoted to atomic and then forwarded,
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; but we can't just drop the atomic from the load.)
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define i32 @test5(ptr %p) {
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; CHECK-LABEL: @test5(
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; CHECK-NEXT: [[X:%.*]] = load atomic i32, ptr [[P:%.*]] unordered, align 4
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; CHECK-NEXT: [[Z:%.*]] = shl i32 [[X]], 1
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; CHECK-NEXT: ret i32 [[Z]]
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;
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%x = load atomic i32, ptr %p unordered, align 4
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%y = load i32, ptr %p, align 4
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%z = add i32 %x, %y
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ret i32 %z
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}
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; Forwarding atomic to atomic is fine
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define i32 @test6(ptr %p) {
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; CHECK-LABEL: @test6(
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; CHECK-NEXT: [[X:%.*]] = load atomic i32, ptr [[P:%.*]] unordered, align 4
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; CHECK-NEXT: [[Z:%.*]] = shl i32 [[X]], 1
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; CHECK-NEXT: ret i32 [[Z]]
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;
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%x = load atomic i32, ptr %p unordered, align 4
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%y = load atomic i32, ptr %p unordered, align 4
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%z = add i32 %x, %y
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ret i32 %z
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}
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; FIXME: we currently don't do anything for monotonic
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define i32 @test7(ptr %p) {
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; CHECK-LABEL: @test7(
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; CHECK-NEXT: [[X:%.*]] = load atomic i32, ptr [[P:%.*]] seq_cst, align 4
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; CHECK-NEXT: [[Y:%.*]] = load atomic i32, ptr [[P]] monotonic, align 4
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; CHECK-NEXT: [[Z:%.*]] = add i32 [[X]], [[Y]]
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; CHECK-NEXT: ret i32 [[Z]]
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;
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%x = load atomic i32, ptr %p seq_cst, align 4
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%y = load atomic i32, ptr %p monotonic, align 4
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%z = add i32 %x, %y
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ret i32 %z
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}
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; FIXME: We could forward in racy code
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define i32 @test8(ptr %p) {
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; CHECK-LABEL: @test8(
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; CHECK-NEXT: [[X:%.*]] = load atomic i32, ptr [[P:%.*]] seq_cst, align 4
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; CHECK-NEXT: [[Y:%.*]] = load atomic i32, ptr [[P]] acquire, align 4
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; CHECK-NEXT: [[Z:%.*]] = add i32 [[X]], [[Y]]
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; CHECK-NEXT: ret i32 [[Z]]
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;
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%x = load atomic i32, ptr %p seq_cst, align 4
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%y = load atomic i32, ptr %p acquire, align 4
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%z = add i32 %x, %y
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ret i32 %z
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}
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; An unordered access to null is still unreachable. There's no
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; ordering imposed.
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define i32 @test9() {
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; CHECK-LABEL: @test9(
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; CHECK-NEXT: store i32 poison, ptr null, align 4294967296
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; CHECK-NEXT: ret i32 poison
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;
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%x = load atomic i32, ptr null unordered, align 4
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ret i32 %x
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}
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define i32 @test9_no_null_opt() #0 {
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; CHECK-LABEL: @test9_no_null_opt(
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; CHECK-NEXT: [[X:%.*]] = load atomic i32, ptr null unordered, align 4294967296
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; CHECK-NEXT: ret i32 [[X]]
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;
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%x = load atomic i32, ptr null unordered, align 4
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ret i32 %x
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}
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; FIXME: Could also fold
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define i32 @test10() {
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; CHECK-LABEL: @test10(
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; CHECK-NEXT: [[X:%.*]] = load atomic i32, ptr null monotonic, align 4294967296
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; CHECK-NEXT: ret i32 [[X]]
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;
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%x = load atomic i32, ptr null monotonic, align 4
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ret i32 %x
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}
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define i32 @test10_no_null_opt() #0 {
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; CHECK-LABEL: @test10_no_null_opt(
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; CHECK-NEXT: [[X:%.*]] = load atomic i32, ptr null monotonic, align 4294967296
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; CHECK-NEXT: ret i32 [[X]]
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;
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%x = load atomic i32, ptr null monotonic, align 4
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ret i32 %x
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}
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; Would this be legal to fold? Probably?
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define i32 @test11() {
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; CHECK-LABEL: @test11(
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; CHECK-NEXT: [[X:%.*]] = load atomic i32, ptr null seq_cst, align 4294967296
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; CHECK-NEXT: ret i32 [[X]]
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;
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%x = load atomic i32, ptr null seq_cst, align 4
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ret i32 %x
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}
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define i32 @test11_no_null_opt() #0 {
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; CHECK-LABEL: @test11_no_null_opt(
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; CHECK-NEXT: [[X:%.*]] = load atomic i32, ptr null seq_cst, align 4294967296
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; CHECK-NEXT: ret i32 [[X]]
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;
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%x = load atomic i32, ptr null seq_cst, align 4
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ret i32 %x
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}
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; An unordered access to null is still unreachable. There's no
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; ordering imposed.
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define i32 @test12() {
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; CHECK-LABEL: @test12(
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; CHECK-NEXT: store atomic i32 poison, ptr null unordered, align 4294967296
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; CHECK-NEXT: ret i32 0
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;
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store atomic i32 0, ptr null unordered, align 4
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ret i32 0
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}
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define i32 @test12_no_null_opt() #0 {
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; CHECK-LABEL: @test12_no_null_opt(
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; CHECK-NEXT: store atomic i32 0, ptr null unordered, align 4294967296
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; CHECK-NEXT: ret i32 0
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;
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store atomic i32 0, ptr null unordered, align 4
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ret i32 0
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}
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; FIXME: Could also fold
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define i32 @test13() {
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; CHECK-LABEL: @test13(
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; CHECK-NEXT: store atomic i32 0, ptr null monotonic, align 4294967296
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; CHECK-NEXT: ret i32 0
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;
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store atomic i32 0, ptr null monotonic, align 4
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ret i32 0
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}
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define i32 @test13_no_null_opt() #0 {
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; CHECK-LABEL: @test13_no_null_opt(
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; CHECK-NEXT: store atomic i32 0, ptr null monotonic, align 4294967296
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; CHECK-NEXT: ret i32 0
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;
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store atomic i32 0, ptr null monotonic, align 4
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ret i32 0
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}
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; Would this be legal to fold? Probably?
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define i32 @test14() {
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; CHECK-LABEL: @test14(
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; CHECK-NEXT: store atomic i32 0, ptr null seq_cst, align 4294967296
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; CHECK-NEXT: ret i32 0
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;
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store atomic i32 0, ptr null seq_cst, align 4
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ret i32 0
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}
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define i32 @test14_no_null_opt() #0 {
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; CHECK-LABEL: @test14_no_null_opt(
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; CHECK-NEXT: store atomic i32 0, ptr null seq_cst, align 4294967296
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; CHECK-NEXT: ret i32 0
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;
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store atomic i32 0, ptr null seq_cst, align 4
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ret i32 0
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}
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@a = external global i32
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@b = external global i32
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define i32 @test15(i1 %cnd) {
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; CHECK-LABEL: @test15(
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; CHECK-NEXT: [[A_VAL:%.*]] = load atomic i32, ptr @a unordered, align 4
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; CHECK-NEXT: [[B_VAL:%.*]] = load atomic i32, ptr @b unordered, align 4
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; CHECK-NEXT: [[X:%.*]] = select i1 [[CND:%.*]], i32 [[A_VAL]], i32 [[B_VAL]]
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; CHECK-NEXT: ret i32 [[X]]
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;
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%addr = select i1 %cnd, ptr @a, ptr @b
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%x = load atomic i32, ptr %addr unordered, align 4
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ret i32 %x
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}
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; FIXME: This would be legal to transform
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define i32 @test16(i1 %cnd) {
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; CHECK-LABEL: @test16(
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; CHECK-NEXT: [[ADDR:%.*]] = select i1 [[CND:%.*]], ptr @a, ptr @b
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; CHECK-NEXT: [[X:%.*]] = load atomic i32, ptr [[ADDR]] monotonic, align 4
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; CHECK-NEXT: ret i32 [[X]]
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;
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%addr = select i1 %cnd, ptr @a, ptr @b
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%x = load atomic i32, ptr %addr monotonic, align 4
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ret i32 %x
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}
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; FIXME: This would be legal to transform
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define i32 @test17(i1 %cnd) {
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; CHECK-LABEL: @test17(
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; CHECK-NEXT: [[ADDR:%.*]] = select i1 [[CND:%.*]], ptr @a, ptr @b
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; CHECK-NEXT: [[X:%.*]] = load atomic i32, ptr [[ADDR]] seq_cst, align 4
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; CHECK-NEXT: ret i32 [[X]]
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;
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%addr = select i1 %cnd, ptr @a, ptr @b
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%x = load atomic i32, ptr %addr seq_cst, align 4
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ret i32 %x
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}
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define i32 @test22(i1 %cnd) {
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; CHECK-LABEL: @test22(
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; CHECK-NEXT: br i1 [[CND:%.*]], label [[BLOCK1:%.*]], label [[BLOCK2:%.*]]
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; CHECK: block1:
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; CHECK-NEXT: br label [[MERGE:%.*]]
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; CHECK: block2:
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; CHECK-NEXT: br label [[MERGE]]
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; CHECK: merge:
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; CHECK-NEXT: [[STOREMERGE:%.*]] = phi i32 [ 2, [[BLOCK2]] ], [ 1, [[BLOCK1]] ]
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; CHECK-NEXT: store atomic i32 [[STOREMERGE]], ptr @a unordered, align 4
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; CHECK-NEXT: ret i32 0
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;
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br i1 %cnd, label %block1, label %block2
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block1:
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store atomic i32 1, ptr @a unordered, align 4
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br label %merge
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block2:
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store atomic i32 2, ptr @a unordered, align 4
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br label %merge
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merge:
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ret i32 0
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}
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; TODO: probably also legal here
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define i32 @test23(i1 %cnd) {
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; CHECK-LABEL: @test23(
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; CHECK-NEXT: br i1 [[CND:%.*]], label [[BLOCK1:%.*]], label [[BLOCK2:%.*]]
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; CHECK: block1:
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; CHECK-NEXT: store atomic i32 1, ptr @a monotonic, align 4
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; CHECK-NEXT: br label [[MERGE:%.*]]
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; CHECK: block2:
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; CHECK-NEXT: store atomic i32 2, ptr @a monotonic, align 4
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; CHECK-NEXT: br label [[MERGE]]
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; CHECK: merge:
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; CHECK-NEXT: ret i32 0
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;
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br i1 %cnd, label %block1, label %block2
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block1:
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store atomic i32 1, ptr @a monotonic, align 4
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br label %merge
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block2:
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store atomic i32 2, ptr @a monotonic, align 4
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br label %merge
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merge:
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ret i32 0
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}
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declare void @clobber()
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define i32 @test18(ptr %p) {
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; CHECK-LABEL: @test18(
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; CHECK-NEXT: [[X:%.*]] = load atomic float, ptr [[P:%.*]] unordered, align 4
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; CHECK-NEXT: call void @clobber()
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; CHECK-NEXT: store atomic float [[X]], ptr [[P]] unordered, align 4
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; CHECK-NEXT: ret i32 0
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;
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%x = load atomic float, ptr %p unordered, align 4
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call void @clobber() ;; keep the load around
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store atomic float %x, ptr %p unordered, align 4
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ret i32 0
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}
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; TODO: probably also legal in this case
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define i32 @test19(ptr %p) {
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; CHECK-LABEL: @test19(
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; CHECK-NEXT: [[X:%.*]] = load atomic float, ptr [[P:%.*]] seq_cst, align 4
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; CHECK-NEXT: call void @clobber()
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; CHECK-NEXT: store atomic float [[X]], ptr [[P]] seq_cst, align 4
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; CHECK-NEXT: ret i32 0
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;
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%x = load atomic float, ptr %p seq_cst, align 4
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call void @clobber() ;; keep the load around
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store atomic float %x, ptr %p seq_cst, align 4
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ret i32 0
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}
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define i32 @test20(ptr %p, ptr %v) {
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; CHECK-LABEL: @test20(
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; CHECK-NEXT: store atomic ptr [[V:%.*]], ptr [[P:%.*]] unordered, align 4
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; CHECK-NEXT: ret i32 0
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;
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store atomic ptr %v, ptr %p unordered, align 4
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ret i32 0
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}
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define i32 @test21(ptr %p, ptr %v) {
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; CHECK-LABEL: @test21(
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; CHECK-NEXT: store atomic ptr [[V:%.*]], ptr [[P:%.*]] monotonic, align 4
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; CHECK-NEXT: ret i32 0
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;
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store atomic ptr %v, ptr %p monotonic, align 4
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ret i32 0
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}
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define void @pr27490a(ptr %p1, ptr %p2) {
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; CHECK-LABEL: @pr27490a(
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; CHECK-NEXT: [[L:%.*]] = load ptr, ptr [[P1:%.*]], align 8
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; CHECK-NEXT: store volatile ptr [[L]], ptr [[P2:%.*]], align 8
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; CHECK-NEXT: ret void
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;
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%l = load ptr, ptr %p1
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store volatile ptr %l, ptr %p2
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ret void
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}
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define void @pr27490b(ptr %p1, ptr %p2) {
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; CHECK-LABEL: @pr27490b(
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; CHECK-NEXT: [[L:%.*]] = load ptr, ptr [[P1:%.*]], align 8
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; CHECK-NEXT: store atomic ptr [[L]], ptr [[P2:%.*]] seq_cst, align 8
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; CHECK-NEXT: ret void
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;
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%l = load ptr, ptr %p1
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store atomic ptr %l, ptr %p2 seq_cst, align 8
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ret void
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}
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;; At the moment, we can't form atomic vectors by folding since these are
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;; not representable in the IR. This was pr29121. The right long term
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;; solution is to extend the IR to handle this case.
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define <2 x float> @no_atomic_vector_load(ptr %p) {
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; CHECK-LABEL: @no_atomic_vector_load(
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; CHECK-NEXT: [[LOAD:%.*]] = load atomic i64, ptr [[P:%.*]] unordered, align 8
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; CHECK-NEXT: [[DOTCAST:%.*]] = bitcast i64 [[LOAD]] to <2 x float>
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; CHECK-NEXT: ret <2 x float> [[DOTCAST]]
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;
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%load = load atomic i64, ptr %p unordered, align 8
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%.cast = bitcast i64 %load to <2 x float>
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ret <2 x float> %.cast
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}
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define void @no_atomic_vector_store(<2 x float> %p, ptr %p2) {
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; CHECK-LABEL: @no_atomic_vector_store(
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; CHECK-NEXT: [[TMP1:%.*]] = bitcast <2 x float> [[P:%.*]] to i64
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; CHECK-NEXT: store atomic i64 [[TMP1]], ptr [[P2:%.*]] unordered, align 8
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; CHECK-NEXT: ret void
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;
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%1 = bitcast <2 x float> %p to i64
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store atomic i64 %1, ptr %p2 unordered, align 8
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ret void
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}
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@c = constant i32 42
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@g = global i32 42
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define i32 @atomic_load_from_constant_global() {
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; CHECK-LABEL: @atomic_load_from_constant_global(
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; CHECK-NEXT: ret i32 42
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;
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%v = load atomic i32, ptr @c seq_cst, align 4
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ret i32 %v
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}
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define i8 @atomic_load_from_constant_global_bitcast() {
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; CHECK-LABEL: @atomic_load_from_constant_global_bitcast(
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; CHECK-NEXT: ret i8 42
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;
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%v = load atomic i8, ptr @c seq_cst, align 1
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ret i8 %v
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}
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define void @atomic_load_from_non_constant_global() {
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; CHECK-LABEL: @atomic_load_from_non_constant_global(
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; CHECK-NEXT: [[TMP1:%.*]] = load atomic i32, ptr @g seq_cst, align 4
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; CHECK-NEXT: ret void
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;
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load atomic i32, ptr @g seq_cst, align 4
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ret void
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}
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define void @volatile_load_from_constant_global() {
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; CHECK-LABEL: @volatile_load_from_constant_global(
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; CHECK-NEXT: [[TMP1:%.*]] = load volatile i32, ptr @c, align 4
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; CHECK-NEXT: ret void
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;
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load volatile i32, ptr @c, align 4
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ret void
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}
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attributes #0 = { null_pointer_is_valid }
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