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01b306e575
The only generated code difference is that now we call memcpy when the size of the array is unknown. This matches GCC behavior and is better since the run time value can be arbitrarily large. llvm-svn: 42433
18 lines
473 B
LLVM
18 lines
473 B
LLVM
; RUN: llvm-as < %s | llc -march=x86-64 | grep call.*memcpy | count 2
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declare void @llvm.memcpy.i64(i8*, i8*, i64, i32)
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define i8* @my_memcpy(i8* %a, i8* %b, i64 %n) {
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entry:
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tail call void @llvm.memcpy.i64( i8* %a, i8* %b, i64 %n, i32 1 )
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ret i8* %a
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}
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define i8* @my_memcpy2(i64* %a, i64* %b, i64 %n) {
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entry:
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%tmp14 = bitcast i64* %a to i8*
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%tmp25 = bitcast i64* %b to i8*
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tail call void @llvm.memcpy.i64(i8* %tmp14, i8* %tmp25, i64 %n, i32 8 )
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ret i8* %tmp14
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}
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