/usr/src/gcc-4.4/debian/patches/arm-gcc-gcse.diff is in gcc-4.4-source 4.4.7-1ubuntu2.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 | # DP: ARM: Don't copy uncopyable instructions in gcse.c (backport from the trunk).
gcc/
2009-05-27 Julian Brown <julian@codesourcery.com>
* gcse.c (target.h): Include.
(can_assign_to_reg_without_clobbers_p): Check that the target allows
copy of argument to a pseudo register.
--- a/src/gcc/gcse.c.orig 2009-04-27 13:55:13.000000000 +0200
+++ b/src/gcc/gcse.c 2009-12-09 11:12:05.000000000 +0100
@@ -172,6 +172,7 @@
#include "hashtab.h"
#include "df.h"
#include "dbgcnt.h"
+#include "target.h"
/* Propagate flow information through back edges and thus enable PRE's
moving loop invariant calculations out of loops.
@@ -1203,7 +1204,11 @@
static GTY(()) rtx test_insn;
-/* Return true if we can assign X to a pseudo register. */
+/* Return true if we can assign X to a pseudo register.
+
+ Additionally, if the target requires it, check that the resulting insn
+ can be copied. If it cannot, this means that X is special and probably
+ has hidden side-effects we don't want to mess with. */
static bool
can_assign_to_reg_p (rtx x)
@@ -1233,8 +1238,18 @@
valid. */
PUT_MODE (SET_DEST (PATTERN (test_insn)), GET_MODE (x));
SET_SRC (PATTERN (test_insn)) = x;
- return ((icode = recog (PATTERN (test_insn), test_insn, &num_clobbers)) >= 0
- && (num_clobbers == 0 || ! added_clobbers_hard_reg_p (icode)));
+
+ icode = recog (PATTERN (test_insn), test_insn, &num_clobbers);
+ if (icode < 0)
+ return false;
+
+ if (num_clobbers > 0 && added_clobbers_hard_reg_p (icode))
+ return false;
+
+ if (targetm.cannot_copy_insn_p && targetm.cannot_copy_insn_p (test_insn))
+ return false;
+
+ return true;
}
/* Return nonzero if the operands of expression X are unchanged from the
|