Hello, Today appears to be RTL loop optimizer patch day, because here's another patch...
The problem here is that variable expansion does not update REG_EQUAL notes when it performs replacement of the renamed register. I fixed this by using validate_replace_rtx_group(). There is already code in analyze_insn_to_expand_var() to make sure that the to-be-replaced register is only used to accumulate into, so I think that using validate_replace_rtx_group is safe. Could use a 2nd pair of eyes to make sure, though. Tested with a bootstrapped compiler. Test coverage isn't great, because variable expansion is not enabled by default. OK for trunk? Ciao! Steven
pr54919.diff
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