https://bugs.llvm.org/show_bug.cgi?id=44462
Bug ID: 44462
Summary: X86FlagsCopyLowering.cpp fails to remove killed
$eflags from successor live-ins
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: Backend: X86
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected],
[email protected], [email protected]
test/CodeGen/X86/copy-eflags.ll contains a function PR37100 which results in
this bug.
This was exposed by the (temporarily reverted) machine verifier improvement for
live-in lists (see https://reviews.llvm.org/D68267 which also has some
discussion about this test case).
https://reviews.llvm.org/D71375 is a suggested patch for
X86FlagsCopyLowering.cpp.
# After X86 EFLAGS copy lowering
bb.1.bb1:
...
TEST8rr %23:gr8, %23:gr8, implicit-def $eflags
JCC_1 %bb.3, 5, implicit killed $eflags
bb.2.bb1:
; predecessors: %bb.1
successors: %bb.3(0x80000000); %bb.3(100.00%)
liveins: $eflags
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