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39fe272c25
bcopy is still widely used mainly for network apps. Sadly, LLVM has no optimizations for bcopy, but there are some for memmove. Since bcopy == memmove, it is profitable to transform bcopy to memmove and use current optimizations for memmove for free here. llvm-svn: 373537
26 lines
966 B
LLVM
26 lines
966 B
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt < %s -instcombine -S | FileCheck %s
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declare void @bcopy(i8* nocapture readonly, i8* nocapture, i32)
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define void @bcopy_memmove(i8* nocapture readonly %a, i8* nocapture %b) {
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; CHECK-LABEL: @bcopy_memmove(
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; CHECK-NEXT: [[TMP1:%.*]] = bitcast i8* [[A:%.*]] to i64*
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; CHECK-NEXT: [[TMP2:%.*]] = bitcast i8* [[B:%.*]] to i64*
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; CHECK-NEXT: [[TMP3:%.*]] = load i64, i64* [[TMP1]], align 1
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; CHECK-NEXT: store i64 [[TMP3]], i64* [[TMP2]], align 1
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; CHECK-NEXT: ret void
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;
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tail call void @bcopy(i8* %a, i8* %b, i32 8)
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ret void
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}
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define void @bcopy_memmove2(i8* nocapture readonly %a, i8* nocapture %b, i32 %len) {
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; CHECK-LABEL: @bcopy_memmove2(
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; CHECK-NEXT: call void @llvm.memmove.p0i8.p0i8.i32(i8* align 1 [[B:%.*]], i8* align 1 [[A:%.*]], i32 [[LEN:%.*]], i1 false)
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; CHECK-NEXT: ret void
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;
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tail call void @bcopy(i8* %a, i8* %b, i32 %len)
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ret void
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}
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