https://bugs.llvm.org/show_bug.cgi?id=38680
Bug ID: 38680
Summary: The RegisterCoalescer don't propagate undef flag when
removing IMPLICIT_DEF
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: Register Allocator
Assignee: unassignedb...@nondot.org
Reporter: karl-johan.karls...@ericsson.com
CC: llvm-bugs@lists.llvm.org
Created attachment 20760
--> https://bugs.llvm.org/attachment.cgi?id=20760&action=edit
llc -O0 -mtriple i686-- -o - ./registercoalescer_implicitdef.mir
-run-pass=simple-register-coalescing
$ llc -O0 -mtriple i686-- -o - ./registercoalescer_implicitdef.mir
-run-pass=simple-register-coalescing
# Machine code for function main: NoPHIs, TracksLiveness
bb.0:
%1:gr32 = ADD32ri8 %1:gr32, 1, implicit-def dead $eflags
CMP32ri8 %0:gr32, 42, implicit-def $eflags
# End machine code for function main.
*** Bad machine code: Reading virtual register without a def ***
- function: main
- basic block: %bb.0 (0x6d981f8)
- instruction: CMP32ri8 %0:gr32, 42, implicit-def $eflags
- operand 0: %0:gr32
LLVM ERROR: Found 1 machine code errors.
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