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authorEric Andersen <andersen@codepoet.org>2003-01-30 19:39:51 +0000
committerEric Andersen <andersen@codepoet.org>2003-01-30 19:39:51 +0000
commit4508ca9bf6b3bac49379555d310e9443051c6c0b (patch)
treef04e3ec07ee7254548ca3b46e4fc7da2e3dbc213
parent97395255e4c0864a603c0b2718d1506169aafeec (diff)
Fix for an optimization bug that shows up on xscale.
Problem report and patch from http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view&pr=8896
-rw-r--r--sources/gcc-3.2.1-arm-xscale.patch21
1 files changed, 21 insertions, 0 deletions
diff --git a/sources/gcc-3.2.1-arm-xscale.patch b/sources/gcc-3.2.1-arm-xscale.patch
new file mode 100644
index 000000000..0d5588e3c
--- /dev/null
+++ b/sources/gcc-3.2.1-arm-xscale.patch
@@ -0,0 +1,21 @@
+--- gcc-3.2.1/gcc/reload1.c.orig 2002-10-10 09:40:20.000000000 -0600
++++ gcc-3.2.1/gcc/reload1.c 2003-01-30 12:15:05.000000000 -0700
+@@ -8674,7 +8674,9 @@
+ ... (MEM (PLUS (REGZ) (REGY)))... .
+
+ First, check that we have (set (REGX) (PLUS (REGX) (REGY)))
+- and that we know all uses of REGX before it dies. */
++ and that we know all uses of REGX before it dies.
++ Also, explicitly check that REGX != REGY; our life information
++ does not yet show whether REGY changes in this insn. */
+ set = single_set (insn);
+ if (set != NULL_RTX
+ && GET_CODE (SET_DEST (set)) == REG
+@@ -8684,6 +8686,7 @@
+ && GET_CODE (SET_SRC (set)) == PLUS
+ && GET_CODE (XEXP (SET_SRC (set), 1)) == REG
+ && rtx_equal_p (XEXP (SET_SRC (set), 0), SET_DEST (set))
++ && !rtx_equal_p (XEXP (SET_SRC (set), 1), SET_DEST (set))
+ && last_label_ruid < reg_state[REGNO (SET_DEST (set))].use_ruid)
+ {
+ rtx reg = SET_DEST (set);