[LLVMbugs] [Bug 18532] Multiplication of a float vector by -1 should be transformed to an XOR of sign bits.
bugzilla-daemon at llvm.org
bugzilla-daemon at llvm.org
Sat Jan 18 08:47:22 PST 2014
http://llvm.org/bugs/show_bug.cgi?id=18532
Benjamin Kramer <benny.kra at gmail.com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
CC| |benny.kra at gmail.com
Resolution|--- |FIXED
--- Comment #1 from Benjamin Kramer <benny.kra at gmail.com> ---
With r199553:
$ cat mul.c
#include <immintrin.h>
__m128 foo(__m128 x) {
return _mm_mul_ps(x, _mm_set1_ps(-1.0f));
}
$ clang -O -S -o - mul.c
[...]
LCPI0_0:
.long 2147483648 ## float -0.000000e+00
.long 2147483648 ## float -0.000000e+00
.long 2147483648 ## float -0.000000e+00
.long 2147483648 ## float -0.000000e+00
[...]
xorps LCPI0_0(%rip), %xmm0
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