https://bugs.llvm.org/show_bug.cgi?id=47740
Bug ID: 47740
Summary: LVI-CFI overwrites register used for return value
Product: new-bugs
Version: unspecified
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: new bugs
Assignee: unassignedb...@nondot.org
Reporter: llvm-bugzi...@jbeekman.nl
CC: htmldevelo...@gmail.com, llvm-bugs@lists.llvm.org
The following code:
target datalayout =
"e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
define { i64, i128 } @ret_i64_i128() #0 {
ret { i64, i128 } { i64 1, i128 36893488147419103235 }
}
attributes #0 = { "target-features"="+lvi-cfi" }
Generates the following assembly:
ret_i64_i128: # @ret_i64_i128
.cfi_startproc
# %bb.0:
movl $1, %eax
movl $3, %edx
movl $2, %ecx
popq %rcx
lfence
jmpq *%rcx
.Lfunc_end0:
.size ret_i64_i128, .Lfunc_end0-ret_i64_i128
.cfi_endproc
As you can tell, the LVI-CFI pass is using RCX although that register was used
for part of the return value.
--
You are receiving this mail because:
You are on the CC list for the bug._______________________________________________
llvm-bugs mailing list
llvm-bugs@lists.llvm.org
https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-bugs
