https://llvm.org/bugs/show_bug.cgi?id=26903
Bug ID: 26903
Summary: llvm/clang doesn't inline __builtin_mempcpy
Product: new-bugs
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: new bugs
Assignee: unassignedb...@nondot.org
Reporter: hjl.to...@gmail.com
CC: david.l.kreit...@intel.com, llvm-bugs@lists.llvm.org,
zia.ans...@intel.com
Classification: Unclassified
[hjl@gnu-6 pr70155a]$ cat m.i
extern char *src, *dst;
char *
foo1 (void)
{
return __builtin_memcpy (dst, src, 16);
}
char *
foo2 (void)
{
return __builtin_mempcpy (dst, src, 16);
}
[hjl@gnu-6 pr70155a]$
/export/build/gnu/llvm-clang-bootstrap/stage1/build-x86_64-linux/bin/clang -S
-O2 m.i
[hjl@gnu-6 pr70155a]$ cat m.s
.text
.file "m.i"
.globl foo1
.p2align 4, 0x90
.type foo1,@function
foo1: # @foo1
.cfi_startproc
# BB#0:
movq dst(%rip), %rax
movq src(%rip), %rcx
movups (%rcx), %xmm0
movups %xmm0, (%rax)
retq
.Lfunc_end0:
.size foo1, .Lfunc_end0-foo1
.cfi_endproc
.globl foo2
.p2align 4, 0x90
.type foo2,@function
foo2: # @foo2
.cfi_startproc
# BB#0:
movq dst(%rip), %rdi
movq src(%rip), %rsi
movl $16, %edx
jmp mempcpy # TAILCALL
.Lfunc_end1:
.size foo2, .Lfunc_end1-foo2
.cfi_endproc
.ident "clang version 3.9.0 (http://llvm.org/git/clang.git
fdef93f7bb7594c6a2a623835f9d5330184bf37c) (http://llvm.org/git/llvm.git
ffadaf5667befa7f105aa48fca597d26d8c7ee49)"
.section ".note.GNU-stack","",@progbits
[hjl@gnu-6 pr70155a]$
I was expecting something like
foo2:
movq dst(%rip), %rax
movq src(%rip), %rcx
movups (%rcx), %xmm0
movups %xmm0, (%rax)
addq $16, %rax
retq
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