http://llvm.org/bugs/show_bug.cgi?id=21742
Bug ID: 21742
Summary: PowerPC cc clobber fails to clobber cr0
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: Backend: PowerPC
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
I'm testing with a build that contains r223328. I notice at least one place
where using "cc" in the clobbers doesn't actually clobber cr0. We see the
andi./iselgt broken up by some inline assembly:
12f0: 01 00 84 70 andi. r4,r4,1
12f4: a8 18 80 7c ldarx r4,0,r3
12f8: 78 a0 84 7c andc r4,r4,r20
12fc: ad 19 80 7c stdcx. r4,0,r3
1300: f4 ff a2 40 bne 12f4
1304: 5e c8 b5 7e iselgt r21,r21,r25
If I convert the inline assembly to use "cr0", then we see the correct
behaviour.
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