https://llvm.org/bugs/show_bug.cgi?id=30426
Bug ID: 30426
Summary: x86_64 with SSE2 disabled: Assertion failed: (Reg >=
X86::FP0 && Reg <= X86::FP6 && "Expected FP
register!"), function getFPReg
Product: new-bugs
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: new bugs
Assignee: unassignedb...@nondot.org
Reporter: dimi...@andric.com
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
This is a rather strange one. I got a test case via FreeBSD bug 212703 [1],
where somebody encountered a clang 3.4.1 segfault, compiling some sample from
openMVG [2].
This segfault is actually the assertion "(Reg >= X86::FP0 && Reg <= X86::FP6 &&
"Expected FP register!"), function getFPReg", and it even reproduces with trunk
r281149.
For some reason, the build process targets x86_64, but then turns off SSE2, and
this is the key to getting the assertion. The test case is extremely minimal,
and optimization isn't even required:
// compile with: clang -cc1 -triple x86_64 -S -target-feature -sse2
testcase.cpp
void fn1(double);
int main() { fn1(4.); }
As far as I know, disabling SSE2 also disables all the higher forms of SSE, so
I think it just can't find any x87 FP register at all, in this case?
[1] https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=212703
[2] https://github.com/openMVG/openMVG
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