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[Qemu-devel] [PATCH 05/10] tcg: Optimize double-word comparisons against
From: |
Richard Henderson |
Subject: |
[Qemu-devel] [PATCH 05/10] tcg: Optimize double-word comparisons against zero |
Date: |
Tue, 2 Oct 2012 11:32:25 -0700 |
Signed-off-by: Richard Henderson <address@hidden>
---
tcg/optimize.c | 39 +++++++++++++++++++++++++++++++++++++++
1 file changed, 39 insertions(+)
diff --git a/tcg/optimize.c b/tcg/optimize.c
index 592d166..5804b66 100644
--- a/tcg/optimize.c
+++ b/tcg/optimize.c
@@ -746,6 +746,45 @@ static TCGArg *tcg_constant_folding(TCGContext *s,
uint16_t *tcg_opc_ptr,
}
goto do_default;
+ case INDEX_op_brcond2_i32:
+ /* Simplify LT/GE comparisons vs zero to a single compare
+ vs the high word of the input. */
+ if ((args[4] == TCG_COND_LT || args[4] == TCG_COND_GE)
+ && temps[args[2]].state == TCG_TEMP_CONST
+ && temps[args[3]].state == TCG_TEMP_CONST
+ && temps[args[2]].val == 0
+ && temps[args[3]].val == 0) {
+ gen_opc_buf[op_index] = INDEX_op_brcond_i32;
+ gen_args[0] = args[1];
+ gen_args[1] = args[3];
+ gen_args[2] = args[4];
+ gen_args[3] = args[5];
+ gen_args += 4;
+ args += 6;
+ memset(temps, 0, nb_temps * sizeof(struct tcg_temp_info));
+ break;
+ }
+ goto do_default;
+
+ case INDEX_op_setcond2_i32:
+ /* Simplify LT/GE comparisons vs zero to a single compare
+ vs the high word of the input. */
+ if ((args[5] == TCG_COND_LT || args[5] == TCG_COND_GE)
+ && temps[args[3]].state == TCG_TEMP_CONST
+ && temps[args[4]].state == TCG_TEMP_CONST
+ && temps[args[3]].val == 0
+ && temps[args[4]].val == 0) {
+ gen_opc_buf[op_index] = INDEX_op_setcond_i32;
+ gen_args[0] = args[0];
+ gen_args[1] = args[2];
+ gen_args[2] = args[4];
+ gen_args[3] = args[5];
+ gen_args += 4;
+ args += 6;
+ break;
+ }
+ goto do_default;
+
case INDEX_op_call:
nb_call_args = (args[0] >> 16) + (args[0] & 0xffff);
if (!(args[nb_call_args + 1] & (TCG_CALL_CONST | TCG_CALL_PURE))) {
--
1.7.11.4
- Re: [Qemu-devel] [PATCH 01/10] tcg: Split out swap_commutative as a subroutine, (continued)
- [Qemu-devel] [PATCH 02/10] tcg: Canonicalize add2 operand ordering, Richard Henderson, 2012/10/02
- [Qemu-devel] [PATCH 04/10] tcg: Use common code when failing to optimize, Richard Henderson, 2012/10/02
- [Qemu-devel] [PATCH 05/10] tcg: Optimize double-word comparisons against zero,
Richard Henderson <=
- [Qemu-devel] [PATCH 06/10] tcg: Split out subroutines from do_constant_folding_cond, Richard Henderson, 2012/10/02
- [Qemu-devel] [PATCH 10/10] tcg: Optimize mulu2, Richard Henderson, 2012/10/02
[Qemu-devel] [PATCH 08/10] tcg: Constant fold add2 and sub2, Richard Henderson, 2012/10/02
[Qemu-devel] [PATCH 09/10] tcg: Optimize half-dead add2/sub2, Richard Henderson, 2012/10/02