56 lines
2.6 KiB
LLVM
56 lines
2.6 KiB
LLVM
; RUN: opt -basicaa -memcpyopt -instcombine -S < %s | FileCheck %s
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target datalayout = "e-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-unknown-linux-gnu"
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define void @foo([8 x i64]* noalias nocapture sret dereferenceable(64) %sret) {
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entry-block:
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%a = alloca [8 x i64], align 8
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%a.cast = bitcast [8 x i64]* %a to i8*
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call void @llvm.lifetime.start(i64 64, i8* %a.cast)
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call void @llvm.memset.p0i8.i64(i8* %a.cast, i8 0, i64 64, i32 8, i1 false)
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%sret.cast = bitcast [8 x i64]* %sret to i8*
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call void @llvm.memcpy.p0i8.p0i8.i64(i8* %sret.cast, i8* %a.cast, i64 64, i32 8, i1 false)
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call void @llvm.lifetime.end(i64 64, i8* %a.cast)
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ret void
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; CHECK-LABEL: @foo(
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; CHECK: %[[sret_cast:[^=]+]] = bitcast [8 x i64]* %sret to i8*
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; CHECK-NEXT: call void @llvm.memset.p0i8.i64(i8* %[[sret_cast]], i8 0, i64 64
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; CHECK-NOT: call void @llvm.memcpy
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; CHECK: ret void
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}
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define void @bar([8 x i64]* noalias nocapture sret dereferenceable(64) %sret, [8 x i64]* noalias nocapture dereferenceable(64) %out) {
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entry-block:
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%a = alloca [8 x i64], align 8
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%a.cast = bitcast [8 x i64]* %a to i8*
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call void @llvm.lifetime.start(i64 64, i8* %a.cast)
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call void @llvm.memset.p0i8.i64(i8* %a.cast, i8 0, i64 64, i32 8, i1 false)
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%sret.cast = bitcast [8 x i64]* %sret to i8*
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call void @llvm.memcpy.p0i8.p0i8.i64(i8* %sret.cast, i8* %a.cast, i64 64, i32 8, i1 false)
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call void @llvm.memset.p0i8.i64(i8* %a.cast, i8 42, i64 32, i32 8, i1 false)
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%out.cast = bitcast [8 x i64]* %out to i8*
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call void @llvm.memcpy.p0i8.p0i8.i64(i8* %out.cast, i8* %a.cast, i64 64, i32 8, i1 false)
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call void @llvm.lifetime.end(i64 64, i8* %a.cast)
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ret void
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; CHECK-LABEL: @bar(
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; CHECK: %[[a:[^=]+]] = alloca [8 x i64]
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; CHECK: %[[a_cast:[^=]+]] = bitcast [8 x i64]* %[[a]] to i8*
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; CHECK: call void @llvm.memset.p0i8.i64(i8* %[[a_cast]], i8 0, i64 64
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; CHECK: %[[sret_cast:[^=]+]] = bitcast [8 x i64]* %sret to i8*
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; CHECK: call void @llvm.memset.p0i8.i64(i8* %[[sret_cast]], i8 0, i64 64
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; CHECK: call void @llvm.memset.p0i8.i64(i8* %[[a_cast]], i8 42, i64 32
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; CHECK: %[[out_cast:[^=]+]] = bitcast [8 x i64]* %out to i8*
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; CHECK: call void @llvm.memcpy.p0i8.p0i8.i64(i8* %[[out_cast]], i8* %[[a_cast]], i64 64
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; CHECK-NOT: call void @llvm.memcpy
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; CHECK: ret void
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}
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declare void @llvm.lifetime.start(i64, i8* nocapture) nounwind
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declare void @llvm.lifetime.end(i64, i8* nocapture) nounwind
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declare void @llvm.memcpy.p0i8.p0i8.i64(i8* nocapture, i8* nocapture readonly, i64, i32, i1) nounwind
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declare void @llvm.memset.p0i8.i64(i8* nocapture, i8, i64, i32, i1) nounwind
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