1; RUN: llc < %s -march=x86-64 -enable-unsafe-fp-math | FileCheck %s 2 3define double @exact(double %x) { 4; Exact division by a constant converted to multiplication. 5; CHECK: @exact 6; CHECK: mulsd 7 %div = fdiv double %x, 2.0 8 ret double %div 9} 10 11define double @inexact(double %x) { 12; Inexact division by a constant converted to multiplication. 13; CHECK: @inexact 14; CHECK: mulsd 15 %div = fdiv double %x, 0x41DFFFFFFFC00000 16 ret double %div 17} 18 19define double @funky(double %x) { 20; No conversion to multiplication if too funky. 21; CHECK: @funky 22; CHECK: divsd 23 %div = fdiv double %x, 0.0 24 ret double %div 25} 26 27define double @denormal1(double %x) { 28; Don't generate multiplication by a denormal. 29; CHECK: @denormal1 30; CHECK: divsd 31 %div = fdiv double %x, 0x7FD0000000000001 32 ret double %div 33} 34 35define double @denormal2(double %x) { 36; Don't generate multiplication by a denormal. 37; CHECK: @denormal 38; CHECK: divsd 39 %div = fdiv double %x, 0x7FEFFFFFFFFFFFFF 40 ret double %div 41} 42