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target-sparc: Optimize CC_OP_LOGIC conditions 

Signed-off-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
This commit is contained in:
Richard Henderson 2012-10-09 14:49:58 -07:00 committed by Blue Swirl
parent 0fa2a0660c
commit 96b5a3d3cf
1 changed files with 40 additions and 18 deletions
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40
target-sparc/translate.c
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@ -1050,7 +1050,7 @@ static void gen_compare(DisasCompare *cmp, bool xcc, unsigned int cond,
DisasContext *dc) DisasContext *dc)
{ {
static int subcc_cond[16] = { static int subcc_cond[16] = {
-1, /* never */ TCG_COND_NEVER,
TCG_COND_EQ, TCG_COND_EQ,
TCG_COND_LE, TCG_COND_LE,
TCG_COND_LT, TCG_COND_LT,
@ -1058,7 +1058,7 @@ static void gen_compare(DisasCompare *cmp, bool xcc, unsigned int cond,
TCG_COND_LTU, TCG_COND_LTU,
-1, /* neg */ -1, /* neg */
-1, /* overflow */ -1, /* overflow */
-1, /* always */ TCG_COND_ALWAYS,
TCG_COND_NE, TCG_COND_NE,
TCG_COND_GT, TCG_COND_GT,
TCG_COND_GE, TCG_COND_GE,
@ -1068,6 +1068,25 @@ static void gen_compare(DisasCompare *cmp, bool xcc, unsigned int cond,
-1, /* no overflow */ -1, /* no overflow */
}; };
static int logic_cond[16] = {
TCG_COND_NEVER,
TCG_COND_EQ, /* eq: Z */
TCG_COND_LE, /* le: Z | (N ^ V) -> Z | N */
TCG_COND_LT, /* lt: N ^ V -> N */
TCG_COND_EQ, /* leu: C | Z -> Z */
TCG_COND_NEVER, /* ltu: C -> 0 */
TCG_COND_LT, /* neg: N */
TCG_COND_NEVER, /* vs: V -> 0 */
TCG_COND_ALWAYS,
TCG_COND_NE, /* ne: !Z */
TCG_COND_GT, /* gt: !(Z | (N ^ V)) -> !(Z | N) */
TCG_COND_GE, /* ge: !(N ^ V) -> !N */
TCG_COND_NE, /* gtu: !(C | Z) -> !Z */
TCG_COND_ALWAYS, /* geu: !C -> 1 */
TCG_COND_GE, /* pos: !N */
TCG_COND_ALWAYS, /* vc: !V -> 1 */
};
TCGv_i32 r_src; TCGv_i32 r_src;
TCGv r_dst; TCGv r_dst;
@ -1082,11 +1101,9 @@ static void gen_compare(DisasCompare *cmp, bool xcc, unsigned int cond,
#endif #endif
switch (dc->cc_op) { switch (dc->cc_op) {
case CC_OP_SUB: case CC_OP_LOGIC:
switch (cond) { cmp->cond = logic_cond[cond];
case 6: /* neg */ do_compare_dst_0:
case 14: /* pos */
cmp->cond = (cond == 6 ? TCG_COND_LT : TCG_COND_GE);
cmp->is_bool = false; cmp->is_bool = false;
cmp->g2 = false; cmp->g2 = false;
cmp->c2 = tcg_const_tl(0); cmp->c2 = tcg_const_tl(0);
@ -1102,8 +1119,13 @@ static void gen_compare(DisasCompare *cmp, bool xcc, unsigned int cond,
cmp->c1 = cpu_cc_dst; cmp->c1 = cpu_cc_dst;
break; break;
case 0: /* never */ case CC_OP_SUB:
case 8: /* always */ switch (cond) {
case 6: /* neg */
case 14: /* pos */
cmp->cond = (cond == 6 ? TCG_COND_LT : TCG_COND_GE);
goto do_compare_dst_0;
case 7: /* overflow */ case 7: /* overflow */
case 15: /* !overflow */ case 15: /* !overflow */
goto do_dynamic; goto do_dynamic;