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i386: Split V2HImode *punpckwd to SSE instruction [PR101058]

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V2HImode *punpckwd should not be split to the insn that depends on
TARGET_MMX_WITH_SSE, since the later is disabled on 32bit targets.

Also return true early from ix86_vectorize_vec_perm_const when testing
with V2HI mode.  *punpckwd can be used to implement all permutations.

2021-06-14  Uroš Bizjak  <ubizjak@gmail.com>

gcc/
	PR target/101058
	* config/i386/i386-expand.c (ix86_vectorize_vec_perm_const):
	Return true early when testing with V2HImode.
	* config/i386/mmx.md (*punpckwd): Split to sse2_pshuflw_1.

gcc/testsuite/

	PR target/101058
	* gcc.target/i386/pr101058.c: New test.
This commit is contained in:
Uros Bizjak 2021-06-14 20:56:18 +02:00
parent 93bfadf3a1
commit 4986946f3b
3 changed files with 25 additions and 9 deletions
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9
gcc/config/i386/i386-expand.c
View file

@ -20446,9 +20446,12 @@ ix86_vectorize_vec_perm_const (machine_mode vmode, rtx target, rtx op0,
return false;
break;
case E_V2HImode:
if (!TARGET_SSE2)
return false;
break;
if (!TARGET_SSE2)
return false;
/* All implementable with *punpckwd. */
if (d.testing_p)
return true;
break;
case E_V2DImode:
case E_V2DFmode:
if (!TARGET_SSE)

13
gcc/config/i386/mmx.md
View file

@ -3368,16 +3368,18 @@
(vec_concat:V4HI
(match_operand:V2HI 1 "register_operand" "0,Yw")
(match_operand:V2HI 2 "register_operand" "x,Yw"))
(parallel [(match_operand 3 "const_0_to_3_operand")
(match_operand 4 "const_0_to_3_operand")])))]
(parallel [(match_operand 3 "const_0_to_3_operand")
(match_operand 4 "const_0_to_3_operand")])))]
"TARGET_SSE2"
"#"
"&& reload_completed"
[(set (match_dup 5)
(vec_select:V4HI
(vec_select:V8HI
(match_dup 5)
(parallel [(match_dup 3) (match_dup 4)
(const_int 0) (const_int 0)])))]
(const_int 2) (const_int 3)
(const_int 4) (const_int 5)
(const_int 6) (const_int 7)])))]
{
rtx dest = lowpart_subreg (V8HImode, operands[0], V2HImode);
rtx op1 = lowpart_subreg (V8HImode, operands[1], V2HImode);
@ -3395,8 +3397,7 @@
operands[3] = GEN_INT (sel0);
operands[4] = GEN_INT (sel1);
operands[5] = lowpart_subreg (V4HImode, dest, V8HImode);
operands[5] = dest;
}
[(set_attr "isa" "noavx,avx")
(set_attr "type" "sselog")

12
gcc/testsuite/gcc.target/i386/pr101058.c Normal file
View file

@ -0,0 +1,12 @@
/* PR target/101058 */
/* { dg-do compile } */
/* { dg-options "-O3 -msse2 -mno-mmx" } */
short add90Hybrid_a_1;
short *add90Hybrid_b, *add90Hybrid_c, *add90Hybrid_d;
void add90Hybrid() {
for (int i; i < 200; i += 2) {
add90Hybrid_c[i] = add90Hybrid_b[i];
add90Hybrid_d[i] = add90Hybrid_a_1 - add90Hybrid_b[i + 1];
}
}