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From 16f29b266435c7eaffc5081c6bba4651d56a8ce8 Mon Sep 17 00:00:00 2001
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From: Aurelien Jarno <aurelien@aurel32.net>
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Date: Thu, 6 Sep 2012 16:47:13 +0200
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Subject: [PATCH] tcg/optimize: split expression simplification
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Split expression simplification in multiple parts so that a given op
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can appear multiple times. This patch should not change anything.
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Reviewed-by: Richard Henderson <rth@twiddle.net>
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Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
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Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
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---
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tcg/optimize.c | 14 +++++++++++++-
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1 file changed, 13 insertions(+), 1 deletion(-)
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diff --git a/tcg/optimize.c b/tcg/optimize.c
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index 9c65474..63f970d 100644
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--- a/tcg/optimize.c
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+++ b/tcg/optimize.c
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@@ -322,7 +322,7 @@ static TCGArg *tcg_constant_folding(TCGContext *s, uint16_t *tcg_opc_ptr,
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break;
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}
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- /* Simplify expression if possible. */
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+ /* Simplify expression for "op r, a, 0 => mov r, a" cases */
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switch (op) {
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CASE_OP_32_64(add):
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CASE_OP_32_64(sub):
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@@ -352,6 +352,12 @@ static TCGArg *tcg_constant_folding(TCGContext *s, uint16_t *tcg_opc_ptr,
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continue;
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}
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break;
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+ default:
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+ break;
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+ }
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+
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+ /* Simplify expression for "op r, a, 0 => movi r, 0" cases */
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+ switch (op) {
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CASE_OP_32_64(mul):
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if ((temps[args[2]].state == TCG_TEMP_CONST
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&& temps[args[2]].val == 0)) {
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@@ -362,6 +368,12 @@ static TCGArg *tcg_constant_folding(TCGContext *s, uint16_t *tcg_opc_ptr,
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continue;
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}
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break;
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+ default:
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+ break;
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+ }
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+
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+ /* Simplify expression for "op r, a, a => mov r, a" cases */
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+ switch (op) {
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CASE_OP_32_64(or):
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CASE_OP_32_64(and):
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if (args[1] == args[2]) {
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--
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1.7.12.1
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