576714b309
As requested in the PR, the one's complement abs can be done more
efficiently without cmov or branching.
Had to change the ifcvt-onecmpl-abs-1.c testcase, we no longer optimize
it in ifcvt, on x86_64 with -m32 we generate in the end the exact same
code, but with -m64:
movl %edi, %eax
- notl %eax
- cmpl %edi, %eax
- cmovl %edi, %eax
+ sarl $31, %eax
+ xorl %edi, %eax
ret
2021-01-05 Jakub Jelinek <jakub@redhat.com>
PR tree-optimization/96928
* tree-ssa-phiopt.c (xor_replacement): New function.
(tree_ssa_phiopt_worker): Call it.
* gcc.dg/tree-ssa/pr96928.c: New test.
* gcc.target/i386/ifcvt-onecmpl-abs-1.c: Remove -fdump-rtl-ce1,
instead of scanning rtl dump for ifcvt message check assembly
for xor instruction.
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