66 lines
2.4 KiB
LLVM
66 lines
2.4 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; Test that the memcpy library call simplifier works correctly.
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;
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; RUN: opt < %s -passes=instcombine -S | FileCheck %s
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target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128"
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declare ptr @memcpy(ptr, ptr, i32)
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; Check memcpy(mem1, mem2, size) -> llvm.memcpy(mem1, mem2, size, 1).
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define ptr @test_simplify1(ptr %mem1, ptr %mem2, i32 %size) {
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; CHECK-LABEL: @test_simplify1(
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; CHECK-NEXT: call void @llvm.memcpy.p0.p0.i32(ptr align 1 [[MEM1:%.*]], ptr align 1 [[MEM2:%.*]], i32 [[SIZE:%.*]], i1 false)
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; CHECK-NEXT: ret ptr [[MEM1]]
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;
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%ret = call ptr @memcpy(ptr %mem1, ptr %mem2, i32 %size)
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ret ptr %ret
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}
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; Verify that the strictfp attr doesn't block this optimization.
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define ptr @test_simplify2(ptr %mem1, ptr %mem2, i32 %size) strictfp {
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; CHECK-LABEL: @test_simplify2(
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; CHECK-NEXT: call void @llvm.memcpy.p0.p0.i32(ptr align 1 [[MEM1:%.*]], ptr align 1 [[MEM2:%.*]], i32 [[SIZE:%.*]], i1 false) #[[ATTR0:[0-9]+]]
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; CHECK-NEXT: ret ptr [[MEM1]]
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;
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%ret = call ptr @memcpy(ptr %mem1, ptr %mem2, i32 %size) strictfp
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ret ptr %ret
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}
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; Verify that the first parameter to memcpy could itself be a call that's not
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; tail, while the call to @memcpy could be tail.
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declare ptr @get_dest()
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define ptr @test_simplify3(ptr %mem2, i32 %size) {
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; CHECK-LABEL: @test_simplify3(
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; CHECK-NEXT: [[DEST:%.*]] = call ptr @get_dest()
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; CHECK-NEXT: tail call void @llvm.memcpy.p0.p0.i32(ptr align 1 [[DEST]], ptr align 1 [[MEM2:%.*]], i32 [[SIZE:%.*]], i1 false)
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; CHECK-NEXT: ret ptr [[DEST]]
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;
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%dest = call ptr @get_dest()
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%ret = tail call ptr @memcpy(ptr %dest, ptr %mem2, i32 %size)
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ret ptr %ret
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}
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define ptr @test_no_incompatible_attr(ptr %mem1, ptr %mem2, i32 %size) {
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; CHECK-LABEL: @test_no_incompatible_attr(
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; CHECK-NEXT: call void @llvm.memcpy.p0.p0.i32(ptr align 1 [[MEM1:%.*]], ptr align 1 [[MEM2:%.*]], i32 [[SIZE:%.*]], i1 false)
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; CHECK-NEXT: ret ptr [[MEM1]]
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;
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%ret = call dereferenceable(1) ptr @memcpy(ptr %mem1, ptr %mem2, i32 %size)
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ret ptr %ret
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}
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define ptr @test_no_simplify1(ptr %mem1, ptr %mem2, i32 %size) {
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; CHECK-LABEL: @test_no_simplify1(
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; CHECK-NEXT: [[RET:%.*]] = musttail call ptr @memcpy(ptr [[MEM1:%.*]], ptr [[MEM2:%.*]], i32 [[SIZE:%.*]])
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; CHECK-NEXT: ret ptr [[RET]]
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;
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%ret = musttail call ptr @memcpy(ptr %mem1, ptr %mem2, i32 %size)
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ret ptr %ret
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}
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