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From af2bf6bcc6614622c87d28e9d763b57408c17500 Mon Sep 17 00:00:00 2001
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From: Richard Henderson <rth@twiddle.net>
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Date: Fri, 21 Sep 2012 10:13:38 -0700
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Subject: [PATCH] tcg: Optimize two-address commutative operations
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While swapping constants to the second operand, swap
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sources matching destinations to the first operand.
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Signed-off-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 | 15 ++++++++++++++-
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1 file changed, 14 insertions(+), 1 deletion(-)
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diff --git a/tcg/optimize.c b/tcg/optimize.c
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index 26038a6..1be7631 100644
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--- a/tcg/optimize.c
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+++ b/tcg/optimize.c
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@@ -334,6 +334,8 @@ static TCGArg *tcg_constant_folding(TCGContext *s, uint16_t *tcg_opc_ptr,
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const TCGOpDef *def;
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TCGArg *gen_args;
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TCGArg tmp;
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+ TCGCond cond;
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+
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/* Array VALS has an element for each temp.
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If this temp holds a constant then its value is kept in VALS' element.
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If this temp is a copy of other ones then this equivalence class'
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@@ -395,13 +397,24 @@ static TCGArg *tcg_constant_folding(TCGContext *s, uint16_t *tcg_opc_ptr,
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}
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break;
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CASE_OP_32_64(movcond):
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+ cond = args[5];
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if (temps[args[1]].state == TCG_TEMP_CONST
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&& temps[args[2]].state != TCG_TEMP_CONST) {
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tmp = args[1];
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args[1] = args[2];
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args[2] = tmp;
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- args[5] = tcg_swap_cond(args[5]);
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+ cond = tcg_swap_cond(cond);
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+ }
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+ /* For movcond, we canonicalize the "false" input reg to match
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+ the destination reg so that the tcg backend can implement
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+ a "move if true" operation. */
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+ if (args[0] == args[3]) {
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+ tmp = args[3];
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+ args[3] = args[4];
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+ args[4] = tmp;
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+ cond = tcg_invert_cond(cond);
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}
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+ args[5] = cond;
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default:
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break;
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}
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