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Regression (was: Re: [PATCH][4.2] Fix PR31797, make forwprop not prop...)

> Date: Sat, 12 May 2007 19:20:04 +0200 (CEST)
> From: Richard Guenther <>

> 2007-05-12  Richard Guenther  <>
> 	PR tree-optimization/31797
> 	* tree-ssa-forwprop.c (forward_propagate_addr_expr): Do not
> 	propagate into a stmt that has volatile ops.

This change (*) causes the following regressions for cris-elf,
but seem general so I'm a bit surprised you don't see them on

Running /tmp/hpautotest-gcc1/gcc/gcc/testsuite/gcc.dg/tree-ssa/tree-ssa.exp ...
FAIL: gcc.dg/tree-ssa/pr17141-1.c scan-tree-dump-times & 0
Running /tmp/hpautotest-gcc1/gcc/gcc/testsuite/g++.dg/dg.exp ...
FAIL: g++.dg/tree-ssa/pr31146.C scan-tree-dump i\[j.*\] = 1;

with log files containing:
Executing on host: /tmp/hpautotest-gcc1/cris-elf/gccobj/gcc/xgcc -B/tmp/hpautotest-gcc1/cris-elf/gccobj/gcc/ /tmp/hpautotest-gcc1/gcc/gcc/testsuite/gcc.dg/tree-ssa/pr17141-1.c   -O2 -fdump-tree-forwprop2 -fno-show-column -S   -isystem /tmp/hpautotest-gcc1/cris-elf/gccobj/cris-elf/./newlib/targ-include -isystem /tmp/hpautotest-gcc1/gcc/newlib/libc/include  -o pr17141-1.s    (timeout = 300)
PASS: gcc.dg/tree-ssa/pr17141-1.c (test for excess errors)
FAIL: gcc.dg/tree-ssa/pr17141-1.c scan-tree-dump-times & 0

and g++.log:
Executing on host: /tmp/hpautotest-gcc1/cris-elf/gccobj/gcc/testsuite/g++/../../g++ -B/tmp/hpautotest-gcc1/cris-elf/gccobj/gcc/testsuite/g++/../../ /tmp/hpautotest-gcc1/gcc/gcc/testsuite/g++.dg/tree-ssa/pr31146.C  -nostdinc++ -I/tmp/hpautotest-gcc1/cris-elf/gccobj/cris-elf/libstdc++-v3/include/cris-elf -I/tmp/hpautotest-gcc1/cris-elf/gccobj/cris-elf/libstdc++-v3/include -I/tmp/hpautotest-gcc1/gcc/libstdc++-v3/libsupc++ -I/tmp/hpautotest-gcc1/gcc/libstdc++-v3/include/backward -I/tmp/hpautotest-gcc1/gcc/libstdc++-v3/testsuite/util -fmessage-length=0  -O -fdump-tree-forwprop1  -S   -isystem /tmp/hpautotest-gcc1/cris-elf/gccobj/cris-elf/./newlib/targ-include -isystem /tmp/hpautotest-gcc1/gcc/newlib/libc/include  -o pr31146.s    (timeout = 300)
PASS: g++.dg/tree-ssa/pr31146.C (test for excess errors)
FAIL: g++.dg/tree-ssa/pr31146.C scan-tree-dump i\[j.*\] = 1;

*) Theoretically but very unlikely, another change in
124634:124640 could cause it, but the other non-library changes
are RTL only.

brgds, H-P

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