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Diffstat (limited to 'test/CodeGen/X86/fdiv-combine.ll')
-rw-r--r-- | test/CodeGen/X86/fdiv-combine.ll | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/test/CodeGen/X86/fdiv-combine.ll b/test/CodeGen/X86/fdiv-combine.ll new file mode 100644 index 0000000..279bb06 --- /dev/null +++ b/test/CodeGen/X86/fdiv-combine.ll @@ -0,0 +1,31 @@ +; RUN: llc < %s -mtriple=x86_64-unknown-unknown | FileCheck %s + +; Anything more than one division using a single divisor operand +; should be converted into a reciprocal and multiplication. + +define float @div1_arcp(float %x, float %y, float %z) #0 { +; CHECK-LABEL: div1_arcp: +; CHECK: # BB#0: +; CHECK-NEXT: divss %xmm1, %xmm0 +; CHECK-NEXT: retq + %div1 = fdiv arcp float %x, %y + ret float %div1 +} + +define float @div2_arcp(float %x, float %y, float %z) #0 { +; CHECK-LABEL: div2_arcp: +; CHECK: # BB#0: +; CHECK-NEXT: movss {{.*#+}} xmm3 = mem[0],zero,zero,zero +; CHECK-NEXT: divss %xmm2, %xmm3 +; CHECK-NEXT: mulss %xmm3, %xmm0 +; CHECK-NEXT: mulss %xmm1, %xmm0 +; CHECK-NEXT: mulss %xmm3, %xmm0 +; CHECK-NEXT: retq + %div1 = fdiv arcp float %x, %z + %mul = fmul arcp float %div1, %y + %div2 = fdiv arcp float %mul, %z + ret float %div2 +} + +; FIXME: If the backend understands 'arcp', then this attribute is unnecessary. +attributes #0 = { "unsafe-fp-math"="true" } |