haraldwolff/qemu-patch-raspberry4
1
0
Fork 0
Code Issues Pull requests Packages Projects Releases Wiki Activity

target-i386: optimize setbe

Browse source 
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>
This commit is contained in:
Richard Henderson 2013-01-23 13:49:43 -08:00
parent 1a5c635947
commit 2cb4764577
1 changed files with 3 additions and 4 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

7
target-i386/translate.c
View file

@ -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;