[llvm-bugs] [Bug 26625] New: Using -Os on i686: Assertion failed: (Reg >= X86::FP0 && Reg <= X86::FP6 && "Expected FP register!"), function getFPReg

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https://llvm.org/bugs/show_bug.cgi?id=26625

            Bug ID: 26625
           Summary: Using -Os on i686: 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: unassignedbugs at nondot.org
          Reporter: dimitry at andric.com
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

This assertion only fires when targeting the i386 architecture, with a CPU
'below' pentium4, e.g. i486 through i686, and in combination with -Os.  Neither
-O1 nor -O2 trigger the assertion.

Reduced testcase.c:

float sqrtf(float);
float x0;
void x1(void) { x0 = sqrtf(x0); }

Compile with:

clang -cc1 -triple i686 -emit-obj -Os testcase.c

Results in:

Assertion failed: (Reg >= X86::FP0 && Reg <= X86::FP6 && "Expected FP
register!"), function getFPReg, file
/share/dim/src/llvm/trunk/lib/Target/X86/X86FloatingPoint.cpp, line 289.
Abort trap

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