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[Qemu-devel] [PATCH 25/57] target-i386: optimize setbe
From: |
Richard Henderson |
Subject: |
[Qemu-devel] [PATCH 25/57] target-i386: optimize setbe |
Date: |
Tue, 19 Feb 2013 09:39:59 -0800 |
This is looking at EFLAGS, but it can do so more efficiently with
setcond.
Reviewed-by: Blue Swirl <address@hidden>
Signed-off-by: Paolo Bonzini <address@hidden>
Signed-off-by: Richard Henderson <address@hidden>
---
target-i386/translate.c | 7 +++----
1 file changed, 3 insertions(+), 4 deletions(-)
diff --git a/target-i386/translate.c b/target-i386/translate.c
index c510732..dab6983 100644
--- a/target-i386/translate.c
+++ b/target-i386/translate.c
@@ -1060,10 +1060,9 @@ static void gen_setcc_slow(DisasContext *s, int jcc_op,
TCGv reg, bool inv)
break;
case JCC_BE:
gen_compute_eflags(s);
- tcg_gen_shri_tl(reg, cpu_cc_src, 6);
- tcg_gen_or_tl(reg, reg, cpu_cc_src);
- tcg_gen_andi_tl(reg, reg, 1);
- break;
+ tcg_gen_andi_tl(reg, cpu_cc_src, CC_Z | CC_C);
+ tcg_gen_setcondi_tl(inv ? TCG_COND_EQ : TCG_COND_NE, reg, reg, 0);
+ return;
case JCC_S:
gen_compute_eflags_s(s, reg, inv);
inv = false;
--
1.8.1.2
- [Qemu-devel] [PATCH 02/57] test-i386: make it compile with a recent gcc, (continued)
- [Qemu-devel] [PATCH 02/57] test-i386: make it compile with a recent gcc, Richard Henderson, 2013/02/19
- [Qemu-devel] [PATCH 01/57] test-i386: QEMU_PACKED is not defined here, Richard Henderson, 2013/02/19
- [Qemu-devel] [PATCH 05/57] target-i386: factor setting of s->cc_op handling for string functions, Richard Henderson, 2013/02/19
- [Qemu-devel] [PATCH 03/57] target-i386: use OT_* consistently, Richard Henderson, 2013/02/19
- [Qemu-devel] [PATCH 04/57] target-i386: introduce gen_ext_tl, Richard Henderson, 2013/02/19
- [Qemu-devel] [PATCH 16/57] target-i386: Use gen_update_cc_op everywhere, Richard Henderson, 2013/02/19
- [Qemu-devel] [PATCH 17/57] target-i386: add helper functions to get other flags, Richard Henderson, 2013/02/19
- [Qemu-devel] [PATCH 23/57] target-i386: convert gen_compute_eflags_c to TCG, Richard Henderson, 2013/02/19
- [Qemu-devel] [PATCH 18/57] target-i386: do not compute eflags multiple times consecutively, Richard Henderson, 2013/02/19
- [Qemu-devel] [PATCH 25/57] target-i386: optimize setbe,
Richard Henderson <=
- [Qemu-devel] [PATCH 24/57] target-i386: change gen_setcc_slow_T0 to gen_setcc_slow, Richard Henderson, 2013/02/19
- [Qemu-devel] [PATCH 26/57] target-i386: optimize setle, Richard Henderson, 2013/02/19
- [Qemu-devel] [PATCH 22/57] target-i386: use inverted setcond when computing NS or NZ, Richard Henderson, 2013/02/19
- [Qemu-devel] [PATCH 38/57] target-i386: Update cc_op before TCG branches, Richard Henderson, 2013/02/19
- [Qemu-devel] [PATCH 56/57] target-i386: Implement tzcnt and fix lzcnt, Richard Henderson, 2013/02/19
- [Qemu-devel] [PATCH 52/57] target-i386: Implement SHLX, SARX, SHRX, Richard Henderson, 2013/02/19
- [Qemu-devel] [PATCH 31/57] target-i386: inline gen_prepare_cc_slow, Richard Henderson, 2013/02/19
- [Qemu-devel] [PATCH 36/57] target-i386: use gen_op for cmps/scas, Richard Henderson, 2013/02/19
- [Qemu-devel] [PATCH 41/57] target-i386: Make helper_cc_compute_{all, c} const, Richard Henderson, 2013/02/19
- [Qemu-devel] [PATCH 49/57] target-i386: Implement BZHI, Richard Henderson, 2013/02/19