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rs6000: Use known constant for GET_MODE_NUNITS and similar

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This patch is to clean up some codes with GET_MODE_UNIT_SIZE or
GET_MODE_NUNITS, which can use known constants or just be removed.

Note that Carl Love helped to confirm altivec_vreveti2 introduced
in r12-1341 is useless and can be removed.

gcc/ChangeLog:

	* config/rs6000/altivec.md (altivec_vreveti2): Remove.
	* config/rs6000/vsx.md (*vsx_extract_si, *vsx_extract_si_<uns>float_df,
	*vsx_extract_si_<uns>float_<mode>, *vsx_insert_extract_v4sf_p9): Use
	known constant values to simplify code.
This commit is contained in:
Kewen Lin 2022-01-16 22:55:42 -06:00
parent 240dd6c063
commit b3e77224ed
2 changed files with 12 additions and 29 deletions
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25
gcc/config/rs6000/altivec.md
View file

@ -3961,31 +3961,6 @@
DONE;
})
;; Vector reverse elements
(define_expand "altivec_vreveti2"
[(set (match_operand:TI 0 "register_operand" "=v")
(unspec:TI [(match_operand:TI 1 "register_operand" "v")]
UNSPEC_VREVEV))]
"TARGET_ALTIVEC"
{
int i, j, size, num_elements;
rtvec v = rtvec_alloc (16);
rtx mask = gen_reg_rtx (V16QImode);
size = GET_MODE_UNIT_SIZE (TImode);
num_elements = GET_MODE_NUNITS (TImode);
for (j = 0; j < num_elements; j++)
for (i = 0; i < size; i++)
RTVEC_ELT (v, i + j * size)
= GEN_INT (i + (num_elements - 1 - j) * size);
emit_insn (gen_vec_initv16qiqi (mask, gen_rtx_PARALLEL (V16QImode, v)));
emit_insn (gen_altivec_vperm_ti (operands[0], operands[1],
operands[1], mask));
DONE;
})
;; Vector reverse elements for V16QI V8HI V4SI V4SF
(define_expand "altivec_vreve<mode>2"
[(set (match_operand:VEC_K 0 "register_operand" "=v")

16
gcc/config/rs6000/vsx.md
View file

@ -3854,8 +3854,10 @@
rtx vec_tmp = operands[3];
int value;
/* Adjust index for LE element ordering, the below minuend 3 is computed by
GET_MODE_NUNITS (V4SImode) - 1. */
if (!BYTES_BIG_ENDIAN)
element = GEN_INT (GET_MODE_NUNITS (V4SImode) - 1 - INTVAL (element));
element = GEN_INT (3 - INTVAL (element));
/* If the value is in the correct position, we can avoid doing the VSPLT<x>
instruction. */
@ -4230,8 +4232,10 @@
rtx v4si_tmp = operands[3];
int value;
/* Adjust index for LE element ordering, the below minuend 3 is computed by
GET_MODE_NUNITS (V4SImode) - 1. */
if (!BYTES_BIG_ENDIAN)
element = GEN_INT (GET_MODE_NUNITS (V4SImode) - 1 - INTVAL (element));
element = GEN_INT (3 - INTVAL (element));
/* If the value is in the correct position, we can avoid doing the VSPLT<x>
instruction. */
@ -4273,8 +4277,10 @@
rtx df_tmp = operands[4];
int value;
/* Adjust index for LE element ordering, the below minuend 3 is computed by
GET_MODE_NUNITS (V4SImode) - 1. */
if (!BYTES_BIG_ENDIAN)
element = GEN_INT (GET_MODE_NUNITS (V4SImode) - 1 - INTVAL (element));
element = GEN_INT (3 - INTVAL (element));
/* If the value is in the correct position, we can avoid doing the VSPLT<x>
instruction. */
@ -4466,8 +4472,10 @@
{
int ele = INTVAL (operands[4]);
/* Adjust index for LE element ordering, the below minuend 3 is computed by
GET_MODE_NUNITS (V4SFmode) - 1. */
if (!BYTES_BIG_ENDIAN)
ele = GET_MODE_NUNITS (V4SFmode) - 1 - ele;
ele = 3 - ele;
operands[4] = GEN_INT (GET_MODE_SIZE (SFmode) * ele);
return "xxinsertw %x0,%x2,%4";