From: Richard Henderson <rth@twiddle.net>
Date: Tue, 28 Jan 2014 21:26:17 +0000 (-0800)
Subject: tcg/optimize: Optmize ANDC X,Y,Y to MOV X,0
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=e64e958e202c563730159c52f7c9116c80ceca52;p=qemu.git

tcg/optimize: Optmize ANDC X,Y,Y to MOV X,0

Like we already do for SUB and XOR.

Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Aurelien Jarno <aurelien@aurel32.net>
Signed-off-by: Richard Henderson <rth@twiddle.net>
---

diff --git a/tcg/optimize.c b/tcg/optimize.c
index 0b1dd13a63..c1b9284600 100644
--- a/tcg/optimize.c
+++ b/tcg/optimize.c
@@ -947,6 +947,7 @@ static TCGArg *tcg_constant_folding(TCGContext *s, uint16_t *tcg_opc_ptr,
 
         /* Simplify expression for "op r, a, a => movi r, 0" cases */
         switch (op) {
+        CASE_OP_32_64(andc):
         CASE_OP_32_64(sub):
         CASE_OP_32_64(xor):
             if (temps_are_copies(args[1], args[2])) {