https://bugs.llvm.org/show_bug.cgi?id=42765
Bug ID: 42765
Summary: Avoid spilling the address of the saved stack guard
with -fstack-protector
Product: libraries
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: enhancement
Priority: P
Component: Common Code Generator Code
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
In https://reviews.llvm.org/D64759, we avoid using a different register to
address the slot of the stack guard to be loaded before we compare it with the
original guard.
There are cases where this could still be spilled, potentially by the reg
scavenger.
A few things we could do to make this better:
* Eli Friedman suggested to make the reg scavenger aware of particularly
sensitive registers and force it to choose other registers to spill.
* Sander de Smalen suggested to always enable FP when using stack guards.
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