c8574943c1
In this wrong-code PR the combine pass ends up moving a CC-using instruction past a *compare_cstore<mode>_insn insn_and_split. After reload the *compare_cstore<mode>_insn splitter ends up generating a SUBS instruction that clobbers the condition flags, and things go bad. The solution is simple, the *compare_cstore<mode>_insn pattern should specify that it clobbers the CC register so that combine (or any other pass) does not assume that it can move CC-using patterns across it. This patch does that and fixes the testcase. The testcase FAILs on GCC 8 only, but the buggy pattern is in GCC 6 onwards, so we should backport this as a latent bug fix after it's had some time to bake in trunk. Bootstrapped and tested on aarch64-none-linux-gnu. PR target/84748 * config/aarch64/aarch64.md (*compare_cstore<mode>_insn): Mark pattern as clobbering CC_REGNUM. * gcc.c-torture/execute/pr84748.c: New test. From-SVN: r258366 |
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