https://bugs.llvm.org/show_bug.cgi?id=46079
Bug ID: 46079
Summary: Failure to use vfmadd132sd when appropriate
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: Backend: X86
Assignee: unassignedb...@nondot.org
Reporter: gabrav...@gmail.com
CC: craig.top...@gmail.com, llvm-bugs@lists.llvm.org,
llvm-...@redking.me.uk, spatel+l...@rotateright.com
double f(double a, double b, double c)
{
return a * b + c;
}
When compiled with `-O3 -mavx512f`, GCC produces this :
f(double, double, double):
vfmadd132sd xmm0, xmm2, xmm1
ret
Clang produces this :
f(double, double, double): # @f(double, double, double)
vmulsd xmm0, xmm0, xmm1
vaddsd xmm0, xmm0, xmm2
ret
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