http://llvm.org/bugs/show_bug.cgi?id=5694
Summary: ARM backend miscompiles a <= (0 - b)
Product: libraries
Version: trunk
Platform: PC
OS/Version: Linux
Status: NEW
Severity: normal
Priority: P2
Component: Backend: ARM
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
The ARM backend seems to miscompile the attached testcase.
Expected result:
Hello, World: 0
Actual result on X86:
Hello, World: 0
Actual result on ARM:
Hello, World: 1
Compiled using:
llc -march=arm bug.ll
I think the problem is that it generates the following code:
cmn r0, r1
movls r2, #1
but the cmn instruction sets the condition flags differently than the cmp
instruction.
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