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

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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>
This commit is contained in:
Richard Henderson 2014-01-28 13:26:17 -08:00
parent e201b56418
commit e64e958e20
1 changed files with 1 additions and 0 deletions
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tcg/optimize.c
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@ -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 */ /* Simplify expression for "op r, a, a => movi r, 0" cases */
switch (op) { switch (op) {
CASE_OP_32_64(andc):
CASE_OP_32_64(sub): CASE_OP_32_64(sub):
CASE_OP_32_64(xor): CASE_OP_32_64(xor):
if (temps_are_copies(args[1], args[2])) { if (temps_are_copies(args[1], args[2])) {