diff options
| author | Richard Henderson <richard.henderson@linaro.org> | 2019-04-30 20:45:16 -0700 |
|---|---|---|
| committer | Richard Henderson <richard.henderson@linaro.org> | 2019-05-22 15:09:43 -0400 |
| commit | ebcfb91abed8c0fb180a968b9004419c208dcc02 (patch) | |
| tree | 961037c7153cad1707b9c6ddad509b2176d751ff /tcg | |
| parent | 3ec3538a45f2fead475b0cca6945092c87927b4f (diff) | |
tcg/i386: Use umin/umax in expanding unsigned compare
Using umin(a, b) == a as an expansion for TCG_COND_LEU is a
better alternative to (a - INT_MIN) <= (b - INT_MIN).
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Diffstat (limited to 'tcg')
| -rw-r--r-- | tcg/i386/tcg-target.inc.c | 80 |
1 files changed, 61 insertions, 19 deletions
diff --git a/tcg/i386/tcg-target.inc.c b/tcg/i386/tcg-target.inc.c index 569a2c2120..6ec5e60448 100644 --- a/tcg/i386/tcg-target.inc.c +++ b/tcg/i386/tcg-target.inc.c @@ -3468,28 +3468,61 @@ static bool expand_vec_cmp_noinv(TCGType type, unsigned vece, TCGv_vec v0, TCGv_vec v1, TCGv_vec v2, TCGCond cond) { enum { - NEED_SWAP = 1, - NEED_INV = 2, - NEED_BIAS = 4 - }; - static const uint8_t fixups[16] = { - [0 ... 15] = -1, - [TCG_COND_EQ] = 0, - [TCG_COND_NE] = NEED_INV, - [TCG_COND_GT] = 0, - [TCG_COND_LT] = NEED_SWAP, - [TCG_COND_LE] = NEED_INV, - [TCG_COND_GE] = NEED_SWAP | NEED_INV, - [TCG_COND_GTU] = NEED_BIAS, - [TCG_COND_LTU] = NEED_BIAS | NEED_SWAP, - [TCG_COND_LEU] = NEED_BIAS | NEED_INV, - [TCG_COND_GEU] = NEED_BIAS | NEED_SWAP | NEED_INV, + NEED_INV = 1, + NEED_SWAP = 2, + NEED_BIAS = 4, + NEED_UMIN = 8, + NEED_UMAX = 16, }; TCGv_vec t1, t2; uint8_t fixup; - fixup = fixups[cond & 15]; - tcg_debug_assert(fixup != 0xff); + switch (cond) { + case TCG_COND_EQ: + case TCG_COND_GT: + fixup = 0; + break; + case TCG_COND_NE: + case TCG_COND_LE: + fixup = NEED_INV; + break; + case TCG_COND_LT: + fixup = NEED_SWAP; + break; + case TCG_COND_GE: + fixup = NEED_SWAP | NEED_INV; + break; + case TCG_COND_LEU: + if (vece <= MO_32) { + fixup = NEED_UMIN; + } else { + fixup = NEED_BIAS | NEED_INV; + } + break; + case TCG_COND_GTU: + if (vece <= MO_32) { + fixup = NEED_UMIN | NEED_INV; + } else { + fixup = NEED_BIAS; + } + break; + case TCG_COND_GEU: + if (vece <= MO_32) { + fixup = NEED_UMAX; + } else { + fixup = NEED_BIAS | NEED_SWAP | NEED_INV; + } + break; + case TCG_COND_LTU: + if (vece <= MO_32) { + fixup = NEED_UMAX | NEED_INV; + } else { + fixup = NEED_BIAS | NEED_SWAP; + } + break; + default: + g_assert_not_reached(); + } if (fixup & NEED_INV) { cond = tcg_invert_cond(cond); @@ -3500,7 +3533,16 @@ static bool expand_vec_cmp_noinv(TCGType type, unsigned vece, TCGv_vec v0, } t1 = t2 = NULL; - if (fixup & NEED_BIAS) { + if (fixup & (NEED_UMIN | NEED_UMAX)) { + t1 = tcg_temp_new_vec(type); + if (fixup & NEED_UMIN) { + tcg_gen_umin_vec(vece, t1, v1, v2); + } else { + tcg_gen_umax_vec(vece, t1, v1, v2); + } + v2 = t1; + cond = TCG_COND_EQ; + } else if (fixup & NEED_BIAS) { t1 = tcg_temp_new_vec(type); t2 = tcg_temp_new_vec(type); tcg_gen_dupi_vec(vece, t2, 1ull << ((8 << vece) - 1)); |