Hi!
The following patch renames VI12_AVX2 iterator to VI12_AVX2_AVX512BW
for consistency with some other iterators, as I need VI12_AVX2 without
AVX512BW for this change.
The real meat is a pre-reload define_insn_and_split which combine
can use to optimize psubusw compared to 0 into pminuw compared to op0
(and similarly for psubusb compared to 0 into pminub compared to op0).
According to Agner Fog's tables, psubus[bw] and pminu[bw] timings
are the same, but the advantage of pminu[bw] is that the comparison
doesn't need a zero operand, so e.g. for -msse4.1 it causes changes like
- psubusw %xmm1, %xmm0
- pxor %xmm1, %xmm1
+ pminuw %xmm0, %xmm1
pcmpeqw %xmm1, %xmm0
and similarly for avx2:
- vpsubusb %ymm1, %ymm0, %ymm0
- vpxor %xmm1, %xmm1, %xmm1
- vpcmpeqb %ymm1, %ymm0, %ymm0
+ vpminub %ymm1, %ymm0, %ymm1
+ vpcmpeqb %ymm0, %ymm1, %ymm0
I haven't done the AVX512{BW,VL} define_insn_and_split, they'll need
to match the UNSPEC_PCMP which are used for avx512 comparisons.
Bootstrapped/regtested on x86_64-linux and i686-linux, ok for trunk?
2020-11-25 Jakub Jelinek <ja...@redhat.com>
PR target/96906
* config/i386/sse.md (VI12_AVX2): Remove V64QI/V32HI modes.
(VI12_AVX2_AVX512BW): New mode iterator.
(<sse2_avx2>_<plusminus_insn><mode>3<mask_name>,
*<sse2_avx2>_<plusminus_insn><mode>3<mask_name>,
uavg<mode>3_ceil, <sse2_avx2>_uavg<mode>3<mask_name>,
*<sse2_avx2>_uavg<mode>3<mask_name>): Use VI12_AVX2_AVX512BW
iterator instead of VI12_AVX2.
(*<sse2_avx2>_ussub<mode>3_eq0): New define_insn_and_split.
* gcc.target/i386/pr96906-1.c: New test.
--- gcc/config/i386/sse.md.jj 2020-11-24 20:20:06.481079501 +0100
+++ gcc/config/i386/sse.md 2020-11-25 11:22:25.565877452 +0100
@@ -466,6 +466,10 @@ (define_mode_iterator SSESCALARMODE
[(V4TI "TARGET_AVX512BW") (V2TI "TARGET_AVX2") TI])
(define_mode_iterator VI12_AVX2
+ [(V32QI "TARGET_AVX2") V16QI
+ (V16HI "TARGET_AVX2") V8HI])
+
+(define_mode_iterator VI12_AVX2_AVX512BW
[(V64QI "TARGET_AVX512BW") (V32QI "TARGET_AVX2") V16QI
(V32HI "TARGET_AVX512BW") (V16HI "TARGET_AVX2") V8HI])
@@ -11395,18 +11399,18 @@ (define_insn "*<plusminus_insn><mode>3_m
(set_attr "mode" "<sseinsnmode>")])
(define_expand "<sse2_avx2>_<plusminus_insn><mode>3<mask_name>"
- [(set (match_operand:VI12_AVX2 0 "register_operand")
- (sat_plusminus:VI12_AVX2
- (match_operand:VI12_AVX2 1 "vector_operand")
- (match_operand:VI12_AVX2 2 "vector_operand")))]
+ [(set (match_operand:VI12_AVX2_AVX512BW 0 "register_operand")
+ (sat_plusminus:VI12_AVX2_AVX512BW
+ (match_operand:VI12_AVX2_AVX512BW 1 "vector_operand")
+ (match_operand:VI12_AVX2_AVX512BW 2 "vector_operand")))]
"TARGET_SSE2 && <mask_mode512bit_condition> && <mask_avx512bw_condition>"
"ix86_fixup_binary_operands_no_copy (<CODE>, <MODE>mode, operands);")
(define_insn "*<sse2_avx2>_<plusminus_insn><mode>3<mask_name>"
- [(set (match_operand:VI12_AVX2 0 "register_operand" "=x,v")
- (sat_plusminus:VI12_AVX2
- (match_operand:VI12_AVX2 1 "vector_operand" "<comm>0,v")
- (match_operand:VI12_AVX2 2 "vector_operand" "xBm,vm")))]
+ [(set (match_operand:VI12_AVX2_AVX512BW 0 "register_operand" "=x,v")
+ (sat_plusminus:VI12_AVX2_AVX512BW
+ (match_operand:VI12_AVX2_AVX512BW 1 "vector_operand" "<comm>0,v")
+ (match_operand:VI12_AVX2_AVX512BW 2 "vector_operand" "xBm,vm")))]
"TARGET_SSE2 && <mask_mode512bit_condition> && <mask_avx512bw_condition>
&& ix86_binary_operator_ok (<CODE>, <MODE>mode, operands)"
"@
@@ -11418,6 +11422,26 @@ (define_insn "*<sse2_avx2>_<plusminus_in
(set_attr "prefix" "orig,maybe_evex")
(set_attr "mode" "TI")])
+;; PR96906 - optimize psubusw compared to 0 into pminuw compared to op0.
+(define_insn_and_split "*<sse2_avx2>_ussub<mode>3_eq0"
+ [(set (match_operand:VI12_AVX2 0 "register_operand" "=x,x")
+ (eq:VI12_AVX2
+ (us_minus:VI12_AVX2
+ (match_operand:VI12_AVX2 1 "vector_operand" "0,v")
+ (match_operand:VI12_AVX2 2 "vector_operand" "xBm,vm"))
+ (match_operand:VI12_AVX2 3 "const0_operand" "C,C")))]
+ "TARGET_SSE2
+ && (<MODE>mode != V8HImode || TARGET_SSE4_1)
+ && ix86_pre_reload_split ()
+ && ix86_binary_operator_ok (US_MINUS, <MODE>mode, operands)"
+ "#"
+ "&& 1"
+ [(set (match_dup 4)
+ (umin:VI12_AVX2 (match_dup 1) (match_dup 2)))
+ (set (match_dup 0)
+ (eq:VI12_AVX2 (match_dup 4) (match_dup 1)))]
+ "operands[4] = gen_reg_rtx (<MODE>mode);")
+
(define_expand "mulv8qi3"
[(set (match_operand:V8QI 0 "register_operand")
(mult:V8QI (match_operand:V8QI 1 "register_operand")
@@ -12022,15 +12046,15 @@ (define_expand "sdot_prodv4si"
})
(define_expand "uavg<mode>3_ceil"
- [(set (match_operand:VI12_AVX2 0 "register_operand")
- (truncate:VI12_AVX2
+ [(set (match_operand:VI12_AVX2_AVX512BW 0 "register_operand")
+ (truncate:VI12_AVX2_AVX512BW
(lshiftrt:<ssedoublemode>
(plus:<ssedoublemode>
(plus:<ssedoublemode>
(zero_extend:<ssedoublemode>
- (match_operand:VI12_AVX2 1 "vector_operand"))
+ (match_operand:VI12_AVX2_AVX512BW 1 "vector_operand"))
(zero_extend:<ssedoublemode>
- (match_operand:VI12_AVX2 2 "vector_operand")))
+ (match_operand:VI12_AVX2_AVX512BW 2 "vector_operand")))
(match_dup 3))
(const_int 1))))]
"TARGET_SSE2"
@@ -15744,15 +15768,15 @@ (define_expand "vec_unpacks_hi_<mode>"
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(define_expand "<sse2_avx2>_uavg<mode>3<mask_name>"
- [(set (match_operand:VI12_AVX2 0 "register_operand")
- (truncate:VI12_AVX2
+ [(set (match_operand:VI12_AVX2_AVX512BW 0 "register_operand")
+ (truncate:VI12_AVX2_AVX512BW
(lshiftrt:<ssedoublemode>
(plus:<ssedoublemode>
(plus:<ssedoublemode>
(zero_extend:<ssedoublemode>
- (match_operand:VI12_AVX2 1 "vector_operand"))
+ (match_operand:VI12_AVX2_AVX512BW 1 "vector_operand"))
(zero_extend:<ssedoublemode>
- (match_operand:VI12_AVX2 2 "vector_operand")))
+ (match_operand:VI12_AVX2_AVX512BW 2 "vector_operand")))
(match_dup <mask_expand_op3>))
(const_int 1))))]
"TARGET_SSE2 && <mask_mode512bit_condition> && <mask_avx512bw_condition>"
@@ -15762,15 +15786,15 @@ (define_expand "<sse2_avx2>_uavg<mode>3<
})
(define_insn "*<sse2_avx2>_uavg<mode>3<mask_name>"
- [(set (match_operand:VI12_AVX2 0 "register_operand" "=x,v")
- (truncate:VI12_AVX2
+ [(set (match_operand:VI12_AVX2_AVX512BW 0 "register_operand" "=x,v")
+ (truncate:VI12_AVX2_AVX512BW
(lshiftrt:<ssedoublemode>
(plus:<ssedoublemode>
(plus:<ssedoublemode>
(zero_extend:<ssedoublemode>
- (match_operand:VI12_AVX2 1 "vector_operand" "%0,v"))
+ (match_operand:VI12_AVX2_AVX512BW 1 "vector_operand" "%0,v"))
(zero_extend:<ssedoublemode>
- (match_operand:VI12_AVX2 2 "vector_operand" "xBm,vm")))
+ (match_operand:VI12_AVX2_AVX512BW 2 "vector_operand"
"xBm,vm")))
(match_operand:<ssedoublemode> <mask_expand_op3>
"const1_operand"))
(const_int 1))))]
"TARGET_SSE2 && <mask_mode512bit_condition> && <mask_avx512bw_condition>
--- gcc/testsuite/gcc.target/i386/pr96906-1.c.jj 2020-11-25
11:13:16.995100955 +0100
+++ gcc/testsuite/gcc.target/i386/pr96906-1.c 2020-11-25 11:13:16.995100955
+0100
@@ -0,0 +1,62 @@
+/* PR target/96906 */
+/* { dg-do compile } */
+/* { dg-options "-O2 -mavx2" } */
+/* { dg-final { scan-assembler-times "\tvpminub\[^\n\r]*xmm" 2 } } */
+/* { dg-final { scan-assembler-times "\tvpminuw\[^\n\r]*xmm" 2 } } */
+/* { dg-final { scan-assembler-times "\tvpminub\[^\n\r]*ymm" 2 } } */
+/* { dg-final { scan-assembler-times "\tvpminuw\[^\n\r]*ymm" 2 } } */
+/* { dg-final { scan-assembler-times "\tvpcmpeqb\[^\n\r]*xmm" 2 } } */
+/* { dg-final { scan-assembler-times "\tvpcmpeqw\[^\n\r]*xmm" 2 } } */
+/* { dg-final { scan-assembler-times "\tvpcmpeqb\[^\n\r]*ymm" 2 } } */
+/* { dg-final { scan-assembler-times "\tvpcmpeqw\[^\n\r]*ymm" 2 } } */
+/* { dg-final { scan-assembler-not "\tvpsubus\[bw]" } } */
+
+#include <x86intrin.h>
+
+__m128i
+f1 (__m128i x, __m128i y)
+{
+ return _mm_cmpeq_epi16 (_mm_subs_epu16 (x, y), _mm_setzero_si128 ());
+}
+
+__m128i
+f2 (__m128i x, __m128i y)
+{
+ return _mm_cmpeq_epi16 (_mm_min_epu16 (x, y), x);
+}
+
+__m128i
+f3 (__m128i x, __m128i y)
+{
+ return _mm_cmpeq_epi8 (_mm_subs_epu8 (x, y), _mm_setzero_si128 ());
+}
+
+__m128i
+f4 (__m128i x, __m128i y)
+{
+ return _mm_cmpeq_epi8 (_mm_min_epu8 (x, y), x);
+}
+
+__m256i
+f5 (__m256i x, __m256i y)
+{
+ return _mm256_cmpeq_epi16 (_mm256_subs_epu16 (x, y), _mm256_setzero_si256
());
+}
+
+__m256i
+f6 (__m256i x, __m256i y)
+{
+ return _mm256_cmpeq_epi16 (_mm256_min_epu16 (x, y), x);
+}
+
+__m256i
+f7 (__m256i x, __m256i y)
+{
+ return _mm256_cmpeq_epi8 (_mm256_subs_epu8 (x, y), _mm256_setzero_si256 ());
+}
+
+__m256i
+f8 (__m256i x, __m256i y)
+{
+ return _mm256_cmpeq_epi8 (_mm256_min_epu8 (x, y), x);
+}
Jakub
