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Re: [tree-ssa] More jump threading
- From: Richard Henderson <rth at redhat dot com>
- To: law at redhat dot com
- Cc: gcc-patches at gcc dot gnu dot org
- Date: Fri, 16 Jan 2004 00:37:57 -0800
- Subject: Re: [tree-ssa] More jump threading
- References: <200401151850.i0FIoroW012989@speedy.slc.redhat.com>
On Thu, Jan 15, 2004 at 11:50:52AM -0700, law@redhat.com wrote:
> BB2:
> x_2 = PHI (x_1(BB0), 0(BB1))
> if (x_1 == 0) goto BB3 else goto BB4
Yaye. This also fixes another big outstanding issue, that of
not eliminating the input comparison to loops with constant
iteration count.
Plus we get to do it without optimistically duplicating the
loop header, which should make -Os folk happy.
r~