60 lines
2.4 KiB
Diff
60 lines
2.4 KiB
Diff
From 4ce7a1e0aaecb220016af9b4f390b76f7fffcce8 Mon Sep 17 00:00:00 2001
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From: Aurelien Jarno <aurelien@aurel32.net>
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Date: Wed, 19 Sep 2012 21:40:30 +0200
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Subject: [PATCH] tcg/optimize: fix end of basic block detection
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Commit e31b0a7c050711884ad570fe73df806520953618 fixed copy propagation on
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32-bit host by restricting the copy between different types. This was the
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wrong fix.
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The real problem is that the all temps states should be reset at the end
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of a basic block. This was done by adding such operations in the switch,
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but brcond2 was forgotten (that's why the crash was only observed on 32-bit
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hosts).
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Fix that by looking at the TCG_OPF_BB_END instead. We need to keep the case
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for op_set_label as temps might be modified through another path.
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Cc: Blue Swirl <blauwirbel@gmail.com>
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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 | 22 +++++++++-------------
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1 file changed, 9 insertions(+), 13 deletions(-)
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diff --git a/tcg/optimize.c b/tcg/optimize.c
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index 10d9773..9da333c 100644
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--- a/tcg/optimize.c
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+++ b/tcg/optimize.c
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@@ -632,21 +632,17 @@ static TCGArg *tcg_constant_folding(TCGContext *s, uint16_t *tcg_opc_ptr,
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i--;
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}
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break;
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- case INDEX_op_set_label:
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- case INDEX_op_jmp:
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- case INDEX_op_br:
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- memset(temps, 0, nb_temps * sizeof(struct tcg_temp_info));
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- for (i = 0; i < def->nb_args; i++) {
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- *gen_args = *args;
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- args++;
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- gen_args++;
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- }
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- break;
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default:
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/* Default case: we do know nothing about operation so no
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- propagation is done. We only trash output args. */
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- for (i = 0; i < def->nb_oargs; i++) {
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- reset_temp(args[i], nb_temps, nb_globals);
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+ propagation is done. We trash everything if the operation
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+ is the end of a basic block, otherwise we only trash the
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+ output args. */
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+ if (def->flags & TCG_OPF_BB_END) {
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+ memset(temps, 0, nb_temps * sizeof(struct tcg_temp_info));
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+ } else {
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+ for (i = 0; i < def->nb_oargs; i++) {
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+ reset_temp(args[i], nb_temps, nb_globals);
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+ }
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}
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for (i = 0; i < def->nb_args; i++) {
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gen_args[i] = args[i];
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