40 lines
1.7 KiB
Diff
40 lines
1.7 KiB
Diff
From 7c1a67bb734f364ea0643b549e030f04d4eed798 Mon Sep 17 00:00:00 2001
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From: Aurelien Jarno <aurelien@aurel32.net>
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Date: Tue, 11 Sep 2012 16:18:49 +0200
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Subject: [PATCH] tcg/optimize: do copy propagation for all operations
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It is possible to due copy propagation for all operations, even the one
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that have side effects or clobber arguments (it only concerns input
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arguments). That said, the call operation should be handled differently
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due to the variable number of arguments.
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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 | 11 +++++++++--
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1 file changed, 9 insertions(+), 2 deletions(-)
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diff --git a/tcg/optimize.c b/tcg/optimize.c
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index 1904b39..aeb2225 100644
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--- a/tcg/optimize.c
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+++ b/tcg/optimize.c
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@@ -378,8 +378,15 @@ static TCGArg *tcg_constant_folding(TCGContext *s, uint16_t *tcg_opc_ptr,
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op = gen_opc_buf[op_index];
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def = &tcg_op_defs[op];
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/* Do copy propagation */
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- if (!(def->flags & (TCG_OPF_CALL_CLOBBER | TCG_OPF_SIDE_EFFECTS))) {
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- assert(op != INDEX_op_call);
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+ if (op == INDEX_op_call) {
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+ int nb_oargs = args[0] >> 16;
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+ int nb_iargs = args[0] & 0xffff;
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+ for (i = nb_oargs + 1; i < nb_oargs + nb_iargs + 1; i++) {
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+ if (temps[args[i]].state == TCG_TEMP_COPY) {
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+ args[i] = find_better_copy(s, args[i]);
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+ }
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+ }
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+ } else {
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for (i = def->nb_oargs; i < def->nb_oargs + def->nb_iargs; i++) {
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if (temps[args[i]].state == TCG_TEMP_COPY) {
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args[i] = find_better_copy(s, args[i]);
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