<div dir="ltr">This patch changes X86TargetInfo::validateAsmConstraint to check whether constraint "f" is used for output operands and error-out if it is. The following link explains why "=f" is disallowed.<div>
<br></div><div><a href="https://gcc.gnu.org/onlinedocs/gcc/Extended-Asm.html">https://gcc.gnu.org/onlinedocs/gcc/Extended-Asm.html</a></div></div>