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; 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 nuw i8, ptr [[A]], i64 2
; 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)
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