75 lines
2.3 KiB
LLVM
75 lines
2.3 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
|
|
; RUN: opt < %s -passes=instcombine -S | FileCheck %s
|
|
|
|
; Memcpy is copying known-undef, and is thus removable
|
|
define void @test(ptr %dest) {
|
|
; CHECK-LABEL: @test(
|
|
; CHECK-NEXT: ret void
|
|
;
|
|
%a = alloca [7 x i8]
|
|
call void @llvm.memcpy.p0.p0.i64(ptr %dest, ptr %a, i64 7, i1 false)
|
|
ret void
|
|
}
|
|
|
|
; Some non-undef elements
|
|
define void @test2(ptr %dest) {
|
|
; CHECK-LABEL: @test2(
|
|
; CHECK-NEXT: [[A:%.*]] = alloca [7 x i8], align 1
|
|
; CHECK-NEXT: store i8 0, ptr [[A]], align 1
|
|
; CHECK-NEXT: call void @llvm.memcpy.p0.p0.i64(ptr noundef nonnull align 1 dereferenceable(7) [[DEST:%.*]], ptr noundef nonnull align 1 dereferenceable(7) [[A]], i64 7, i1 false)
|
|
; CHECK-NEXT: ret void
|
|
;
|
|
%a = alloca [7 x i8]
|
|
store i8 0, ptr %a
|
|
call void @llvm.memcpy.p0.p0.i64(ptr %dest, ptr %a, i64 7, i1 false)
|
|
ret void
|
|
}
|
|
|
|
; Volatile write is still required
|
|
define void @test3(ptr %dest) {
|
|
; CHECK-LABEL: @test3(
|
|
; CHECK-NEXT: [[A:%.*]] = alloca [7 x i8], align 1
|
|
; CHECK-NEXT: call void @llvm.memcpy.p0.p0.i64(ptr [[DEST:%.*]], ptr [[A]], i64 7, i1 true)
|
|
; CHECK-NEXT: ret void
|
|
;
|
|
%a = alloca [7 x i8]
|
|
call void @llvm.memcpy.p0.p0.i64(ptr %dest, ptr %a, i64 7, i1 true)
|
|
ret void
|
|
}
|
|
|
|
define void @test4(ptr %dest) {
|
|
; CHECK-LABEL: @test4(
|
|
; CHECK-NEXT: ret void
|
|
;
|
|
%a = alloca [7 x i8]
|
|
call void @llvm.memcpy.p0.p0.i64(ptr %dest, ptr %a, i64 7, i1 false)
|
|
ret void
|
|
}
|
|
|
|
define void @test5(ptr %dest) {
|
|
; CHECK-LABEL: @test5(
|
|
; CHECK-NEXT: ret void
|
|
;
|
|
%a = alloca [7 x i8]
|
|
%p2 = getelementptr i32, ptr %a, i32 1
|
|
call void @llvm.memcpy.p0.p0.i64(ptr %dest, ptr %p2, i64 3, i1 false)
|
|
ret void
|
|
}
|
|
|
|
define void @test6(ptr %dest) {
|
|
; CHECK-LABEL: @test6(
|
|
; CHECK-NEXT: [[A:%.*]] = alloca [7 x i8], align 1
|
|
; CHECK-NEXT: [[P2:%.*]] = getelementptr inbounds i16, ptr [[A]], i64 1
|
|
; CHECK-NEXT: store i16 42, ptr [[P2]], align 2
|
|
; CHECK-NEXT: call void @llvm.memcpy.p0.p0.i64(ptr noundef nonnull align 1 dereferenceable(7) [[DEST:%.*]], ptr noundef nonnull align 1 dereferenceable(7) [[P2]], i64 7, i1 false)
|
|
; CHECK-NEXT: ret void
|
|
;
|
|
%a = alloca [7 x i8]
|
|
%p2 = getelementptr i16, ptr %a, i32 1
|
|
store i16 42, ptr %p2
|
|
call void @llvm.memcpy.p0.p0.i64(ptr %dest, ptr %p2, i64 7, i1 false)
|
|
ret void
|
|
}
|
|
|
|
declare void @llvm.memcpy.p0.p0.i64(ptr, ptr, i64, i1)
|