printf with floating point arguments using -mno-sse2 flag is crashing

[llvmbot]

Bugzilla Link	33004
Version	unspecified
OS	Linux
Reporter	LLVM Bugzilla Contributor
CC	@rnk,@rotateright,@ZviRackover

Extended Description

clang crashes while compiling with the flag -mno-sse2 on linux the following code:

#include <stdio.h> 
int main()
{
    printf("%f", 2.0);
    return 0;
}

clang -mno-sse2 test.c

output:
clang-4.0: /export/iusers/ziv/llvm2/llvm/lib/Target/X86/X86FloatingPoint.cpp:303: unsigned int getFPReg(const llvm::MachineOperand&): Assertion `Reg >= X86::FP0 && Reg <= X86::FP6 && "Expected FP register!"' failed.
and backtrace

[rnk]

We shouldn't crash like that, but isn't this another instance of asking for the impossible? Passing floating point in an ABI that can't pass FP values without SSE2?

[rotateright]

Definitely looks like another case of bug 30426 and all of the bugs related there.

[Endilll]

Duplicate of #29774

[llvmbot]

@llvm/issue-subscribers-backend-x86