https://bugs.llvm.org/show_bug.cgi?id=40413
Bug ID: 40413
Summary: __attribute__((preserve_most)) saves 64-bit registers
on 32-bit builds.
Product: clang
Version: trunk
Hardware: All
OS: All
Status: NEW
Severity: normal
Priority: P
Component: C++
Assignee: unassignedclangb...@nondot.org
Reporter: brian.peter.led...@gmail.com
CC: blitzrak...@gmail.com, dgre...@apple.com,
erik.pilking...@gmail.com, llvm-bugs@lists.llvm.org,
richard-l...@metafoo.co.uk
Building
```
void foo();
__attribute__((preserve_most))
int bar(int num) {
foo();
return 0;
}
```
produces the expected pushl and popl commands for saving registers. However,
they are ranging over the set of 64-bit registers, even when -m32 is passed.
If you inspect at line 290 of llvm/lib/Target/X86/X86RegisterInfo.cpp in the
repository, you will see it is referring to the constant
CSR_64_RT_MostRegs_SaveList, which is the set of 64-bit registers.
This will cause the assembler to fail, citing invalid registers, for all 32-bit
targets that use __attribute__((preserve_most)).
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