On 11/06/2015 04:08 AM, Bernd Schmidt wrote:
This one is a fix for something that could currently only affect c6x, but I have code that exposes it on i386.When optionally gathering operand info in regrename, we can overflow the array in certain situations. This can occur when we have a situation where a value is constructed in multiple small registers and then accessed as a larger one (CDImode in the testcase I have). In that case we enter the "superset" path, which fails the involved chains, but the smaller pieces still all get seen by record_operand_use, and there may be more of them than MAX_REGS_PER_ADDRESS. The following fixes it. Bootstrapped and tested with -frename-registers enabled at -O1 on x86_64-linux. Ok? Bernd rr-fail-op.diff * regrename.c (record_operand_use): Keep track of failed operands and stop appending if we see any. * regrename.h (struct operand_rr_info): Add a failed field and shrink n_chains to short.
OK. jeff
