From: Aurelien Jarno <aurelien@aurel32.net>
Date: Wed, 8 May 2013 20:36:39 +0000 (+0200)
Subject: tcg/optimize: fix setcond2 optimization
X-Git-Tag: qemu-xen-4.4.0-rc1~6^2~430
X-Git-Url: http://xenbits.xensource.com/gitweb?a=commitdiff_plain;h=66e61b55f158ef5628e4c056dd2f233c9351a3f5;p=qemu-upstream-4.5-testing.git

tcg/optimize: fix setcond2 optimization

When setcond2 is rewritten into setcond, the state of the destination
temp should be reset, so that a copy of the previous value is not
used instead of the result.

Reported-by: Michael Tokarev <mjt@tls.msk.ru>
Reviewed-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
---

diff --git a/tcg/optimize.c b/tcg/optimize.c
index 1b6644c6c..b35868afb 100644
--- a/tcg/optimize.c
+++ b/tcg/optimize.c
@@ -1057,6 +1057,7 @@ static TCGArg *tcg_constant_folding(TCGContext *s, uint16_t *tcg_opc_ptr,
                 /* Simplify LT/GE comparisons vs zero to a single compare
                    vs the high word of the input.  */
                 s->gen_opc_buf[op_index] = INDEX_op_setcond_i32;
+                reset_temp(args[0]);
                 gen_args[0] = args[0];
                 gen_args[1] = args[2];
                 gen_args[2] = args[4];