Kai Luo 8912252252 [PowerPC] Fix wrong codegen when stack pointer has to realign in prologue ...

Current powerpc backend generates wrong code sequence if stack pointer
has to realign if -fstack-clash-protection enabled. When probing in
prologue, backend should generate a subtraction instruction rather
than a `stux` instruction to realign the stack pointer.

This patch is part of fix of
https://bugs.llvm.org/show_bug.cgi?id=46759.

Differential Revision: https://reviews.llvm.org/D84218

2020-07-22 06:35:12 +00:00

99 KiB

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