From: Richard Henderson <rth@twiddle.net>
Date: Wed, 23 Jan 2013 21:49:43 +0000 (-0800)
Subject: target-i386: optimize setbe
X-Git-Tag: v1.5.0-rc0~616^2~36
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=2cb4764577f270eec259123955a6396ad6a2f161;p=thirdparty%2Fqemu.git

target-i386: optimize setbe

This is looking at EFLAGS, but it can do so more efficiently with
setcond.

Reviewed-by: Blue Swirl <blauwirbel@gmail.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Richard Henderson <rth@twiddle.net>
---

diff --git a/target-i386/translate.c b/target-i386/translate.c
index c510732765a..dab69839a78 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;