| ; RUN: llc -mtriple=x86_64-unknown-unknown -mcpu=x86-64 -mattr=sse -enable-unsafe-fp-math < %s | FileCheck %s --check-prefix=SSE |
| ; RUN: llc -mtriple=x86_64-unknown-unknown -mcpu=x86-64 -mattr=avx -enable-unsafe-fp-math < %s | FileCheck %s --check-prefix=AVX |
| |
| ; Verify that the first two adds are independent regardless of how the inputs are |
| ; commuted. The destination registers are used as source registers for the third add. |
| |
| define float @reassociate_adds1(float %x0, float %x1, float %x2, float %x3) { |
| ; SSE-LABEL: reassociate_adds1: |
| ; SSE: # BB#0: |
| ; SSE-NEXT: addss %xmm1, %xmm0 |
| ; SSE-NEXT: addss %xmm3, %xmm2 |
| ; SSE-NEXT: addss %xmm2, %xmm0 |
| ; SSE-NEXT: retq |
| ; |
| ; AVX-LABEL: reassociate_adds1: |
| ; AVX: # BB#0: |
| ; AVX-NEXT: vaddss %xmm1, %xmm0, %xmm0 |
| ; AVX-NEXT: vaddss %xmm3, %xmm2, %xmm1 |
| ; AVX-NEXT: vaddss %xmm1, %xmm0, %xmm0 |
| ; AVX-NEXT: retq |
| %t0 = fadd float %x0, %x1 |
| %t1 = fadd float %t0, %x2 |
| %t2 = fadd float %t1, %x3 |
| ret float %t2 |
| } |
| |
| define float @reassociate_adds2(float %x0, float %x1, float %x2, float %x3) { |
| ; SSE-LABEL: reassociate_adds2: |
| ; SSE: # BB#0: |
| ; SSE-NEXT: addss %xmm1, %xmm0 |
| ; SSE-NEXT: addss %xmm3, %xmm2 |
| ; SSE-NEXT: addss %xmm2, %xmm0 |
| ; SSE-NEXT: retq |
| ; |
| ; AVX-LABEL: reassociate_adds2: |
| ; AVX: # BB#0: |
| ; AVX-NEXT: vaddss %xmm1, %xmm0, %xmm0 |
| ; AVX-NEXT: vaddss %xmm3, %xmm2, %xmm1 |
| ; AVX-NEXT: vaddss %xmm1, %xmm0, %xmm0 |
| ; AVX-NEXT: retq |
| %t0 = fadd float %x0, %x1 |
| %t1 = fadd float %x2, %t0 |
| %t2 = fadd float %t1, %x3 |
| ret float %t2 |
| } |
| |
| define float @reassociate_adds3(float %x0, float %x1, float %x2, float %x3) { |
| ; SSE-LABEL: reassociate_adds3: |
| ; SSE: # BB#0: |
| ; SSE-NEXT: addss %xmm1, %xmm0 |
| ; SSE-NEXT: addss %xmm3, %xmm2 |
| ; SSE-NEXT: addss %xmm2, %xmm0 |
| ; SSE-NEXT: retq |
| ; |
| ; AVX-LABEL: reassociate_adds3: |
| ; AVX: # BB#0: |
| ; AVX-NEXT: vaddss %xmm1, %xmm0, %xmm0 |
| ; AVX-NEXT: vaddss %xmm3, %xmm2, %xmm1 |
| ; AVX-NEXT: vaddss %xmm1, %xmm0, %xmm0 |
| ; AVX-NEXT: retq |
| %t0 = fadd float %x0, %x1 |
| %t1 = fadd float %t0, %x2 |
| %t2 = fadd float %x3, %t1 |
| ret float %t2 |
| } |
| |
| define float @reassociate_adds4(float %x0, float %x1, float %x2, float %x3) { |
| ; SSE-LABEL: reassociate_adds4: |
| ; SSE: # BB#0: |
| ; SSE-NEXT: addss %xmm1, %xmm0 |
| ; SSE-NEXT: addss %xmm3, %xmm2 |
| ; SSE-NEXT: addss %xmm2, %xmm0 |
| ; SSE-NEXT: retq |
| ; |
| ; AVX-LABEL: reassociate_adds4: |
| ; AVX: # BB#0: |
| ; AVX-NEXT: vaddss %xmm1, %xmm0, %xmm0 |
| ; AVX-NEXT: vaddss %xmm3, %xmm2, %xmm1 |
| ; AVX-NEXT: vaddss %xmm1, %xmm0, %xmm0 |
| ; AVX-NEXT: retq |
| %t0 = fadd float %x0, %x1 |
| %t1 = fadd float %x2, %t0 |
| %t2 = fadd float %x3, %t1 |
| ret float %t2 |
| } |
| |
| ; Verify that we reassociate some of these ops. The optimal balanced tree of adds is not |
| ; produced because that would cost more compile time. |
| |
| define float @reassociate_adds5(float %x0, float %x1, float %x2, float %x3, float %x4, float %x5, float %x6, float %x7) { |
| ; SSE-LABEL: reassociate_adds5: |
| ; SSE: # BB#0: |
| ; SSE-NEXT: addss %xmm1, %xmm0 |
| ; SSE-NEXT: addss %xmm3, %xmm2 |
| ; SSE-NEXT: addss %xmm2, %xmm0 |
| ; SSE-NEXT: addss %xmm5, %xmm4 |
| ; SSE-NEXT: addss %xmm6, %xmm4 |
| ; SSE-NEXT: addss %xmm4, %xmm0 |
| ; SSE-NEXT: addss %xmm7, %xmm0 |
| ; SSE-NEXT: retq |
| ; |
| ; AVX-LABEL: reassociate_adds5: |
| ; AVX: # BB#0: |
| ; AVX-NEXT: vaddss %xmm1, %xmm0, %xmm0 |
| ; AVX-NEXT: vaddss %xmm3, %xmm2, %xmm1 |
| ; AVX-NEXT: vaddss %xmm1, %xmm0, %xmm0 |
| ; AVX-NEXT: vaddss %xmm5, %xmm4, %xmm1 |
| ; AVX-NEXT: vaddss %xmm6, %xmm1, %xmm1 |
| ; AVX-NEXT: vaddss %xmm1, %xmm0, %xmm0 |
| ; AVX-NEXT: vaddss %xmm7, %xmm0, %xmm0 |
| ; AVX-NEXT: retq |
| %t0 = fadd float %x0, %x1 |
| %t1 = fadd float %t0, %x2 |
| %t2 = fadd float %t1, %x3 |
| %t3 = fadd float %t2, %x4 |
| %t4 = fadd float %t3, %x5 |
| %t5 = fadd float %t4, %x6 |
| %t6 = fadd float %t5, %x7 |
| ret float %t6 |
| } |
| |
| ; Verify that we only need two associative operations to reassociate the operands. |
| ; Also, we should reassociate such that the result of the high latency division |
| ; is used by the final 'add' rather than reassociating the %x3 operand with the |
| ; division. The latter reassociation would not improve anything. |
| |
| define float @reassociate_adds6(float %x0, float %x1, float %x2, float %x3) { |
| ; SSE-LABEL: reassociate_adds6: |
| ; SSE: # BB#0: |
| ; SSE-NEXT: divss %xmm1, %xmm0 |
| ; SSE-NEXT: addss %xmm3, %xmm2 |
| ; SSE-NEXT: addss %xmm2, %xmm0 |
| ; SSE-NEXT: retq |
| ; |
| ; AVX-LABEL: reassociate_adds6: |
| ; AVX: # BB#0: |
| ; AVX-NEXT: vdivss %xmm1, %xmm0, %xmm0 |
| ; AVX-NEXT: vaddss %xmm3, %xmm2, %xmm1 |
| ; AVX-NEXT: vaddss %xmm1, %xmm0, %xmm0 |
| ; AVX-NEXT: retq |
| %t0 = fdiv float %x0, %x1 |
| %t1 = fadd float %x2, %t0 |
| %t2 = fadd float %x3, %t1 |
| ret float %t2 |
| } |
| |
| ; Verify that SSE and AVX scalar single-precison multiplies are reassociated. |
| |
| define float @reassociate_muls1(float %x0, float %x1, float %x2, float %x3) { |
| ; SSE-LABEL: reassociate_muls1: |
| ; SSE: # BB#0: |
| ; SSE-NEXT: divss %xmm1, %xmm0 |
| ; SSE-NEXT: mulss %xmm3, %xmm2 |
| ; SSE-NEXT: mulss %xmm2, %xmm0 |
| ; SSE-NEXT: retq |
| ; |
| ; AVX-LABEL: reassociate_muls1: |
| ; AVX: # BB#0: |
| ; AVX-NEXT: vdivss %xmm1, %xmm0, %xmm0 |
| ; AVX-NEXT: vmulss %xmm3, %xmm2, %xmm1 |
| ; AVX-NEXT: vmulss %xmm1, %xmm0, %xmm0 |
| ; AVX-NEXT: retq |
| %t0 = fdiv float %x0, %x1 |
| %t1 = fmul float %x2, %t0 |
| %t2 = fmul float %x3, %t1 |
| ret float %t2 |
| } |
| |
| ; Verify that SSE and AVX scalar double-precison adds are reassociated. |
| |
| define double @reassociate_adds_double(double %x0, double %x1, double %x2, double %x3) { |
| ; SSE-LABEL: reassociate_adds_double: |
| ; SSE: # BB#0: |
| ; SSE-NEXT: divsd %xmm1, %xmm0 |
| ; SSE-NEXT: addsd %xmm3, %xmm2 |
| ; SSE-NEXT: addsd %xmm2, %xmm0 |
| ; SSE-NEXT: retq |
| ; |
| ; AVX-LABEL: reassociate_adds_double: |
| ; AVX: # BB#0: |
| ; AVX-NEXT: vdivsd %xmm1, %xmm0, %xmm0 |
| ; AVX-NEXT: vaddsd %xmm3, %xmm2, %xmm1 |
| ; AVX-NEXT: vaddsd %xmm1, %xmm0, %xmm0 |
| ; AVX-NEXT: retq |
| %t0 = fdiv double %x0, %x1 |
| %t1 = fadd double %x2, %t0 |
| %t2 = fadd double %x3, %t1 |
| ret double %t2 |
| } |
| |
| ; Verify that SSE and AVX scalar double-precison multiplies are reassociated. |
| |
| define double @reassociate_muls_double(double %x0, double %x1, double %x2, double %x3) { |
| ; SSE-LABEL: reassociate_muls_double: |
| ; SSE: # BB#0: |
| ; SSE-NEXT: divsd %xmm1, %xmm0 |
| ; SSE-NEXT: mulsd %xmm3, %xmm2 |
| ; SSE-NEXT: mulsd %xmm2, %xmm0 |
| ; SSE-NEXT: retq |
| ; |
| ; AVX-LABEL: reassociate_muls_double: |
| ; AVX: # BB#0: |
| ; AVX-NEXT: vdivsd %xmm1, %xmm0, %xmm0 |
| ; AVX-NEXT: vmulsd %xmm3, %xmm2, %xmm1 |
| ; AVX-NEXT: vmulsd %xmm1, %xmm0, %xmm0 |
| ; AVX-NEXT: retq |
| %t0 = fdiv double %x0, %x1 |
| %t1 = fmul double %x2, %t0 |
| %t2 = fmul double %x3, %t1 |
| ret double %t2 |
| } |
| |