assigned to @lattner

Reduced testcase:

long long test(int A, int B, int C) {
unsigned X, Y;
asm ("subf%I3c %1,%4,%3\nsubfze %0,%2"
: "=r" (X), "=&r" (Y)
: "r" (A), "rI" (B), "r" (C));
return ((long long)Y << 32) | X;
}

We compile this to:

_test:
# InlineAsm Start
subfc r3,r5,r4
subfze r4,r3
# InlineAsm End
stw r3, -4(r1)
blr

Note that the first instruction clobbers r3 before the second instruction uses it.

-Chris

Fixed. Patch here:
http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20070430/048747.html
There are several other required patches to go along with this though.

Testcase here: CodeGen/PowerPC/2007-04-30-InlineAsmEarlyClobber.ll

-Chris

mentioned in issue llvm/llvm-bugzilla-archive#1374

mentioned in issue #1234