https://llvm.org/bugs/show_bug.cgi?id=28567
Vivek Pandya <vivekvpan...@gmail.com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|RESOLVED |REOPENED
CC| |vivekvpan...@gmail.com
Resolution|INVALID |---
--- Comment #2 from Vivek Pandya <vivekvpan...@gmail.com> ---
I don't think current implement is correct because I have a very simple example
on X86 where only CL is clobbered than also CH is marked as clobbered :
target triple = "x86_64--"
define i8 @main(i8 %X) {
%inc = add i8 %X, 1
%inc2 = mul i8 %inc, 5
ret i8 %inc2
}
for above llvm IR generated X86 code is as follow:
main: # @main
.cfi_startproc
# BB#0:
movb $5, %cl
movl %edi, %eax
mulb %cl
addb $5, %al
retq
So here it is very clear that only CL, CX, RCX, ECX should be marked as
clobbered but current implementation marks CH too.
Here is review request https://reviews.llvm.org/D22400 that should fix this.
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