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cfgexpand sorts variables by decreasing size, so when merging a later variable into an earlier one, there's usually no need to update the merged size. But for poly_int sizes, the sort function just uses a lexicographical comparison of the coefficients, so e.g. 2X+2 comes before 0X+32. Which is bigger depends on the runtime value of X. This patch therefore takes the upper bound of the two sizes, which is conservatively correct for variable-length vectors and a no-op on other targets. It's probably a bad idea to merge fixed-length and variable-length variables in practice, but that's really an optimisation decision. I think we should have this patch as a correctness fix either way. This is easiest to test using the ACLE, but in principle it could happen for autovectorised code too, e.g. when using OpenMP vector variables. It's therefore a regression from GCC 8. 2020-01-22 Richard Sandiford <richard.sandiford@arm.com> gcc/ * cfgexpand.c (union_stack_vars): Update the size. gcc/testsuite/ * gcc.target/aarch64/sve/acle/general/stack_vars_1.c: New test.
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