https://bugs.llvm.org/show_bug.cgi?id=45752
Bug ID: 45752
Summary: [X86] Failure to use sqrtsd destination operand to
optimize out movsd
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: Backend: X86
Assignee: unassignedb...@nondot.org
Reporter: gabrav...@gmail.com
CC: craig.top...@gmail.com, llvm-bugs@lists.llvm.org,
llvm-...@redking.me.uk, spatel+l...@rotateright.com
typedef double v2df __attribute__((vector_size(16)));
v2df _mm_sqrt_sd(v2df a, v2df b)
{
v2df c = __builtin_ia32_sqrtpd((v2df){b[0], b[1]});
return (v2df){c[0], a[1]};
}
GCC -O3 outputs this :
_mm_sqrt_sd(double __vector(2), double __vector(2)):
sqrtsd xmm0, xmm1
ret
LLVM outputs this :
_mm_sqrt_sd(double __vector(2), double __vector(2)):
sqrtpd xmm1, xmm1
movsd xmm0, xmm1 # xmm0 = xmm1[0],xmm0[1]
ret
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