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068317bfa3
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. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@42433 91177308-0d34-0410-b5e6-96231b3b80d8
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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