From: Paolo Bonzini <pbonzini@redhat.com>
To: qemu-devel@nongnu.org
Subject: [Qemu-devel] [PATCH 13/14] i386: optimize setbe
Date: Sat, 6 Oct 2012 14:30:20 +0200 [thread overview]
Message-ID: <1349526621-13939-14-git-send-email-pbonzini@redhat.com> (raw)
In-Reply-To: <1349526621-13939-1-git-send-email-pbonzini@redhat.com>
This is looking at EFLAGS, but it can do so more efficiently with
setcond.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
target-i386/translate.c | 7 +++----
1 file modificato, 3 inserzioni(+), 4 rimozioni(-)
diff --git a/target-i386/translate.c b/target-i386/translate.c
index fb44839..342b9ec 100644
--- a/target-i386/translate.c
+++ b/target-i386/translate.c
@@ -1031,10 +1031,9 @@ static inline void gen_setcc_slow(DisasContext *s, int jcc_op, TCGv reg, bool in
return;
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, 0x41);
+ 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);
return;
--
1.7.12.1
next prev parent reply other threads:[~2012-10-06 12:30 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-10-06 12:30 [Qemu-devel] [CFT PATCH 00/14] Improve handling of x86 condition codes (tcg) Paolo Bonzini
2012-10-06 12:30 ` [Qemu-devel] [PATCH 01/14] i386: use OT_* consistently Paolo Bonzini
2012-10-07 18:50 ` Blue Swirl
2012-10-09 18:58 ` Richard Henderson
2012-10-06 12:30 ` [Qemu-devel] [PATCH 02/14] i386: introduce gen_ext_tl Paolo Bonzini
2012-10-07 18:53 ` Blue Swirl
2012-10-09 18:58 ` Richard Henderson
2012-10-06 12:30 ` [Qemu-devel] [PATCH 03/14] i386: factor setting of s->cc_op handling for string functions Paolo Bonzini
2012-10-09 18:59 ` Richard Henderson
2012-10-06 12:30 ` [Qemu-devel] [PATCH 04/14] i386: drop cc_op argument of gen_jcc1 Paolo Bonzini
2012-10-09 18:59 ` Richard Henderson
2012-10-06 12:30 ` [Qemu-devel] [PATCH 05/14] i386: move eflags computation closer to gen_op_set_cc_op Paolo Bonzini
2012-10-09 19:02 ` Richard Henderson
2012-10-06 12:30 ` [Qemu-devel] [PATCH 06/14] i386: factor gen_op_set_cc_op/tcg_gen_discard_tl around computing flags Paolo Bonzini
2012-10-09 19:03 ` Richard Henderson
2012-10-06 12:30 ` [Qemu-devel] [PATCH 07/14] i386: add helper functions to get other flags Paolo Bonzini
2012-10-07 19:04 ` Blue Swirl
2012-10-09 19:04 ` Richard Henderson
2012-10-06 12:30 ` [Qemu-devel] [PATCH 08/14] i386: do not compute eflags multiple times consecutively Paolo Bonzini
2012-10-07 19:09 ` Blue Swirl
2012-10-09 19:14 ` Richard Henderson
2012-10-06 12:30 ` [Qemu-devel] [PATCH 09/14] i386: do not call helper to compute ZF/SF Paolo Bonzini
2012-10-07 19:16 ` Blue Swirl
2012-10-09 19:15 ` Richard Henderson
2012-10-09 19:16 ` Richard Henderson
2012-10-10 6:42 ` Paolo Bonzini
2012-10-06 12:30 ` [Qemu-devel] [PATCH 10/14] i386: use inverted setcond when computing NS or NZ Paolo Bonzini
2012-10-07 19:19 ` Blue Swirl
2012-10-09 19:17 ` Richard Henderson
2012-10-06 12:30 ` [Qemu-devel] [PATCH 11/14] i386: convert gen_compute_eflags_c to TCG Paolo Bonzini
2012-10-07 19:35 ` Blue Swirl
2012-10-09 20:07 ` Richard Henderson
2012-10-10 6:47 ` Paolo Bonzini
2012-10-06 12:30 ` [Qemu-devel] [PATCH 12/14] i386: change gen_setcc_slow_T0 to gen_setcc_slow Paolo Bonzini
2012-10-07 19:36 ` Blue Swirl
2012-10-09 20:07 ` Richard Henderson
2012-10-06 12:30 ` Paolo Bonzini [this message]
2012-10-07 19:43 ` [Qemu-devel] [PATCH 13/14] i386: optimize setbe Blue Swirl
2012-10-09 20:13 ` Richard Henderson
2012-10-06 12:30 ` [Qemu-devel] [PATCH 14/14] i386: optimize setcc instructions Paolo Bonzini
2012-10-07 19:58 ` Blue Swirl
2012-10-09 20:22 ` Richard Henderson
2012-10-10 6:51 ` Paolo Bonzini
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