http://llvm.org/bugs/show_bug.cgi?id=7980
Summary: RegAllocFast doesn't set correctly kill flag on
implicit use registers
Product: libraries
Version: trunk
Platform: PC
OS/Version: Linux
Status: NEW
Severity: normal
Priority: P
Component: Register Allocator
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
Created an attachment (id=5408)
--> (http://llvm.org/bugs/attachment.cgi?id=5408)
reproducer source
That's bad for later passes, like Register Scavenging.
Reproducer: download the attached test.ll file
$llc -O0 -debug test.ll -verify-machineinstrs
*** Bad machine code: Using an undefined physical register ***
- function: compare
- basic block: entry 0x93ec8a4 (BB#0)
- instruction: JE_4 <BB#4>, %EFLAGS<imp-use,kill>
- operand 1: %EFLAGS<imp-use,kill>
LLVM ERROR: Found 1 machine code errors.
CMP32ri8 %EAX<kill>, 1, %EFLAGS<imp-def>
%DH<def> = SETGr %EFLAGS<imp-use,kill> <- ****ERROR IS HERE, EFLAGS is not
"kill" !!!!*****
MOV8mr <fi#1>, 1, %reg0, 0, %reg0, %DH<kill>; mem:ST1[FixedStack1]
MOV8mr <fi#2>, 1, %reg0, 0, %reg0, %DL<kill>; mem:ST1[FixedStack2]
JE_4 <BB#4>, %EFLAGS<imp-use,kill>
--
Configure bugmail: http://llvm.org/bugs/userprefs.cgi?tab=email
------- You are receiving this mail because: -------
You are on the CC list for the bug.
_______________________________________________
LLVMbugs mailing list
[email protected]
http://lists.cs.uiuc.edu/mailman/listinfo/llvmbugs
