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* [Bug middle-end/92436] SIMD integer subtract with constant always becomes add
[not found] <bug-92436-4@http.gcc.gnu.org/bugzilla/>
@ 2021-08-21 23:14 ` pinskia at gcc dot gnu.org
0 siblings, 0 replies; only message in thread
From: pinskia at gcc dot gnu.org @ 2021-08-21 23:14 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92436
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target|x86, aarch |x86, aarch64
--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Testcases:
x86:
#include <x86intrin.h>
__m128i fn(__m128i a) {
return _mm_or_si128(
_mm_sub_epi8(a, _mm_set1_epi8(99)),
_mm_set1_epi8(99)
);
}
aarch64:
#include <arm_neon.h>
uint8x16_t fn(uint8x16_t a) {
return vorrq_u8(
vsubq_u8(a, vdupq_n_u8(99)),
vdupq_n_u8(99)
);
}
Note aarch64 is a regression from GCC 5.
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2021-08-21 23:14 ` [Bug middle-end/92436] SIMD integer subtract with constant always becomes add pinskia at gcc dot gnu.org
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