... in vec_dupv4sf / *vec_dupv4si. The respective broadcast insns are
never longer (yet sometimes shorter) than the corresponding VSHUFPS /
VPSHUFD, due to the immediate operand of the shuffle insns balancing the
(uniform) need for VEX3 in the broadcast ones. When EVEX encoding is
respective the broadcast insns are always shorter.
Add new alternatives to cover the AVX2 and AVX512 cases as appropriate.
While touching this anyway, switch to consistently using "sseshuf1" in
the "type" attributes for all shuffle forms.
gcc/
* config/i386/sse.md (vec_dupv4sf): Make first alternative use
vbroadcastss for AVX2. New AVX512F alternative.
(*vec_dupv4si): New AVX2 and AVX512F alternatives using
vpbroadcastd. Replace sselog1 by sseshuf1 in "type" attribute.
gcc/testsuite/
* gcc.target/i386/avx2-dupv4sf.c: New test.
* gcc.target/i386/avx2-dupv4si.c: Likewise.
* gcc.target/i386/avx512f-dupv4sf.c: Likewise.
* gcc.target/i386/avx512f-dupv4si.c: Likewise.
---
Note that unlike originally intended, "prefix_extra" isn't dropped:
"length_vex" uses it to determine whether 2-byte VEX encoding is
possible (which it isn't for VBROADCASTSS / VPBROADCASTD). "length"
itself specifically does not use it for VEX/EVEX encoded insns.
Especially with the added "enabled" attribute I didn't really see how to
(further) fold alternatives 0 and 1. Instead *vec_dupv4si might benefit
from using sse2_noavx2 instead of sse2 for alternative 2, except that
there is no sse2_noavx2, only sse2_noavx.
I'm working from the assumption that the isa attributes to the original
1st and 2nd alternatives don't need further restricting (to sse2_noavx2
or avx_noavx2 as applicable), as the new earlier alternatives cover all
operand forms already when at least AVX2 is enabled.
---
v3: Testcases for new alternatives. "type" and "prefix_extra"
adjustments.
v2: Correct operand constraints. Respect -mprefer-vector-width=. Fold
two alternatives of vec_dupv4sf.
--- a/gcc/config/i386/sse.md
+++ b/gcc/config/i386/sse.md
@@ -25969,41 +25969,64 @@
(const_int 1)))])
(define_insn "vec_dupv4sf"
- [(set (match_operand:V4SF 0 "register_operand" "=v,v,x")
+ [(set (match_operand:V4SF 0 "register_operand" "=v,v,v,x")
(vec_duplicate:V4SF
- (match_operand:SF 1 "nonimmediate_operand" "Yv,m,0")))]
+ (match_operand:SF 1 "nonimmediate_operand" "Yv,v,m,0")))]
"TARGET_SSE"
"@
- vshufps\t{$0, %1, %1, %0|%0, %1, %1, 0}
+ * return TARGET_AVX2 ? \"vbroadcastss\t{%1, %0|%0, %1}\" : \"vshufps\t{$0,
%d1, %0|%0, %d1, 0}\";
+ vbroadcastss\t{%1, %g0|%g0, %1}
vbroadcastss\t{%1, %0|%0, %1}
shufps\t{$0, %0, %0|%0, %0, 0}"
- [(set_attr "isa" "avx,avx,noavx")
- (set_attr "type" "sseshuf1,ssemov,sseshuf1")
- (set_attr "length_immediate" "1,0,1")
- (set_attr "prefix_extra" "0,1,*")
- (set_attr "prefix" "maybe_evex,maybe_evex,orig")
- (set_attr "mode" "V4SF")])
+ [(set_attr "isa" "avx,*,avx,noavx")
+ (set (attr "type")
+ (cond [(and (eq_attr "alternative" "0")
+ (match_test "!TARGET_AVX2"))
+(const_string "sseshuf1")
+ (eq_attr "alternative" "3")
+(const_string "sseshuf1")
+ ]
+ (const_string "ssemov")))
+ (set (attr "length_immediate")
+ (if_then_else (eq_attr "type" "sseshuf1")
+ (const_string "1")
+ (const_string "0")))
+ (set_attr "prefix_extra" "0,1,1,*")
+ (set_attr "prefix" "maybe_evex,evex,maybe_evex,orig")
+ (set_attr "mode" "V4SF,V16SF,V4SF,V4SF")
+ (set (attr "enabled")
+ (if_then_else (eq_attr "alternative" "1")
+ (symbol_ref "TARGET_AVX512F && !TARGET_AVX512VL
+ && !TARGET_PREFER_AVX256")
+ (const_string "*")))])
(define_insn "*vec_dupv4si"
- [(set (match_operand:V4SI 0 "register_operand" "=v,v,x")
+ [(set (match_operand:V4SI 0 "register_operand" "=v,v,v,v,x")
(vec_duplicate:V4SI
- (match_operand:SI 1 "nonimmediate_operand" "Yv,m,0")))]
+ (match_operand:SI 1 "nonimmediate_operand" "Yvm,v,Yv,m,0")))]
"TARGET_SSE"
"@
+ vpbroadcastd\t{%1, %0|%0, %1}
+ vpbroadcastd\t{%1, %g0|%g0, %1}
%vpshufd\t{$0, %1, %0|%0, %1, 0}
vbroadcastss\t{%1, %0|%0, %1}
shufps\t{$0, %0, %0|%0, %0, 0}"
- [(set_attr "isa" "sse2,avx,noavx")
- (set_attr "type" "sselog1,ssemov,sselog1")
- (set_attr "length_immediate" "1,0,1")
- (set_attr "prefix_extra" "0,1,*")
- (set_attr "prefix" "maybe_vex,maybe_evex,orig")
- (set_attr "mode" "TI,V4SF,V4SF")
+ [(set_attr "isa" "avx2,*,sse2,avx,noavx")
+ (set_attr "type" "ssemov,ssemov,sseshuf1,ssemov,sseshuf1")
+ (set_attr "length_immediate" "0,0,1,0,1")
+ (set_attr "prefix_extra" "1,1,0,1,*")
+ (set_attr "prefix" "maybe_evex,evex,maybe_vex,maybe_evex,orig")
+ (set_attr "mode" "TI,XI,TI,V4SF,V4SF")
(set (attr "preferred_for_speed")
-
