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tcg/ppc: Use the Set Boolean Extension

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The SETBC family of instructions requires exactly two insns for
all comparisions, saving 0-3 insns per (neg)setcond.

Tested-by: Nicholas Piggin <npiggin@gmail.com>
Reviewed-by: Daniel Henrique Barboza <danielhb413@gmail.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2023-08-05 02:04:56 +00:00
parent cba10bb3c8
commit 72fa954a63
1 changed files with 22 additions and 0 deletions
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22
tcg/ppc/tcg-target.c.inc
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@ -447,6 +447,11 @@ static bool tcg_target_const_match(int64_t val, TCGType type, int ct)
#define TW XO31( 4)
#define TRAP (TW | TO(31))
#define SETBC XO31(384) /* v3.10 */
#define SETBCR XO31(416) /* v3.10 */
#define SETNBC XO31(448) /* v3.10 */
#define SETNBCR XO31(480) /* v3.10 */
#define NOP ORI /* ori 0,0,0 */
#define LVX XO31(103)
@ -1624,6 +1629,23 @@ static void tcg_out_setcond(TCGContext *s, TCGType type, TCGCond cond,
arg2 = (uint32_t)arg2;
}
/* With SETBC/SETBCR, we can always implement with 2 insns. */
if (have_isa_3_10) {
tcg_insn_unit bi, opc;
tcg_out_cmp(s, cond, arg1, arg2, const_arg2, 7, type);
/* Re-use tcg_to_bc for BI and BO_COND_{TRUE,FALSE}. */
bi = tcg_to_bc[cond] & (0x1f << 16);
if (tcg_to_bc[cond] & BO(8)) {
opc = neg ? SETNBC : SETBC;
} else {
opc = neg ? SETNBCR : SETBCR;
}
tcg_out32(s, opc | RT(arg0) | bi);
return;
}
/* Handle common and trivial cases before handling anything else. */
if (arg2 == 0) {
switch (cond) {