On Tue, Sep 27, 2011 at 12:30 AM, Jeff Law l...@redhat.com wrote:
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On 08/18/11 15:59, Richard Henderson wrote:
On 08/17/2011 12:21 AM, Richard Guenther wrote:
The patch itself looks sensible, though I am surprised ifcvt
doesn't run in cfglayout
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On 08/18/11 15:59, Richard Henderson wrote:
On 08/17/2011 12:21 AM, Richard Guenther wrote:
The patch itself looks sensible, though I am surprised ifcvt
doesn't run in cfglayout mode (so you have to use reg notes to
find probabilities ...)
It
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On 08/18/11 15:59, Richard Henderson wrote:
On 08/17/2011 12:21 AM, Richard Guenther wrote:
The patch itself looks sensible, though I am surprised ifcvt
doesn't run in cfglayout mode (so you have to use reg notes to find
probabilities ...)
It
On Tue, Aug 16, 2011 at 11:14 PM, Jeff Law l...@redhat.com wrote:
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ifcvt.c is sometimes over-aggressive in speculating instructions from a
not-predicted path.
Given:
if (test) goto E; // x not live
x = big();
goto L;
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On 08/17/11 01:21, Richard Guenther wrote:
We don't have a way to distinguish branch-taken vs. branch-not-take
costs, right?
Not that I'm aware of. However, BRANCH_COST does allow the backend to
change the cost of a branch based on its
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ifcvt.c is sometimes over-aggressive in speculating instructions from a
not-predicted path.
Given:
if (test) goto E; // x not live
x = big();
goto L;
E:
x = b;
goto M;
ifcvt wants to turn it into:
