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[Bug tree-optimization/18076] Missed jump threading optimization
- From: "law at redhat dot com" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 14 Feb 2005 20:43:54 -0000
- Subject: [Bug tree-optimization/18076] Missed jump threading optimization
- References: <20041020120337.18076.steven@gcc.gnu.org>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Additional Comments From law at redhat dot com 2005-02-14 20:43 -------
I'll note the updated jump threading selection code will catch all these
threading opportunities. I get something like this:
foo:
pushl %ebp
movl %esp, %ebp
movl x, %eax
testb $1, %al
jne .L2
testb $64, %ah
je .L7
.L2:
movl $3, y
movl $4, y
.L7:
leave
ret
I'll note we still have dead stores. :( Missed by both the tree-ssa
optimizers because we don't handle V_MUST_DEF and the RTL optimizers for reasons
unknown.
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What |Removed |Added
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CC| |law at redhat dot com
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18076