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Re: PING (expand^3, tree-ssa)
Richard Guenther wrote:
On Fri, Jun 26, 2009 at 11:47 PM, Paolo Bonzini<bonzini@gnu.org> wrote:
[PATCH] post-cond-optab improvements
http://gcc.gnu.org/ml/gcc-patches/2009-05/msg00815.html
http://gcc.gnu.org/ml/gcc-patches/2009-05/msg00734.html
http://gcc.gnu.org/ml/gcc-patches/2009-05/msg00733.html
These are all ok if the still bootstrap / regtest ok.
They do with this squashed in:
Index: gcc/dojump.c
===================================================================
--- gcc/dojump.c (branch cond-optab2)
+++ gcc/dojump.c (working copy)
@@ -799,7 +799,8 @@ do_compare_rtx_and_jump (rtx op0, rtx op
implement it. */
if ((! if_true_label
|| ! can_compare_p (code, mode, ccp_jump))
- && (code == ORDERED || code == UNORDERED
+ && (! FLOAT_MODE_P (mode)
+ || code == ORDERED || code == UNORDERED
|| (! HONOR_NANS (mode) && (code == LTGT || code == UNEQ))
|| (! HONOR_SNANS (mode) && (code == EQ || code == NE))))
{
It's an obvious bugfix and it is triggered only by
builtin-unreachable-2.c. This is quite expected; __builtin_unreachable
is is the only case in which we do something special at RTL-expansion
time that could cause additional jump threading. Any other missed
optimization with integers would be a missed jump threading on the
tree-level.
I'll rerun regtesting with the above change and commit.
Paolo