[GlobalISel] Fix G_PTR_ADD immediate chain combine using the wrong im… #65271
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…mediate for heuristics. The legal-addressing-mode heuristics in the combine checks that for a pattern: %ptr1 = G_PTR_ADD %_, C_outer %ptr2 = G_PTR_ADD %ptr1, C_inner ...whether a base_reg + C_outer addressing mode is legal as the *original* address. However, the original pointer being analyzed is %ptr2, so it should be C_inner. This provides a 0.1% geomean improvement on CTMark -Os for AArch64.
dzhidzhoev
approved these changes
Sep 4, 2023
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…mediate for heuristics.
The legal-addressing-mode heuristics in the combine checks that for a pattern:
...whether a base_reg +
C_outeraddressing mode is legal as the original address. However, the original pointer being analyzed is%ptr2, so it should beC_inner.This provides a 0.1% geomean improvement on CTMark -Os for AArch64.