diff --git a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp index 661df98212ae..5d2804c711a6 100644 --- a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp +++ b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp @@ -11992,6 +11992,9 @@ SDValue DAGCombiner::visitFDIV(SDNode *N) { if (SDValue NewSel = foldBinOpIntoSelect(N)) return NewSel; + if (SDValue V = combineRepeatedFPDivisors(N)) + return V; + if (Options.UnsafeFPMath || Flags.hasAllowReciprocal()) { // fold (fdiv X, c2) -> fmul X, 1/c2 if losing precision is acceptable. if (N1CFP) { @@ -12081,9 +12084,6 @@ SDValue DAGCombiner::visitFDIV(SDNode *N) { } } - if (SDValue CombineRepeatedDivisors = combineRepeatedFPDivisors(N)) - return CombineRepeatedDivisors; - return SDValue(); } diff --git a/llvm/test/CodeGen/X86/fdiv-combine-vec.ll b/llvm/test/CodeGen/X86/fdiv-combine-vec.ll index 6de3f31892d6..825f8a50f96d 100644 --- a/llvm/test/CodeGen/X86/fdiv-combine-vec.ll +++ b/llvm/test/CodeGen/X86/fdiv-combine-vec.ll @@ -51,25 +51,17 @@ define <4 x double> @splat_fdiv_v4f64(<4 x double> %x, double %y) { define <4 x float> @splat_fdiv_v4f32(<4 x float> %x, float %y) { ; SSE-LABEL: splat_fdiv_v4f32: ; SSE: # %bb.0: -; SSE-NEXT: shufps {{.*#+}} xmm1 = xmm1[0,0,0,0] -; SSE-NEXT: rcpps %xmm1, %xmm2 -; SSE-NEXT: mulps %xmm2, %xmm1 -; SSE-NEXT: movaps {{.*#+}} xmm3 = [1.0E+0,1.0E+0,1.0E+0,1.0E+0] -; SSE-NEXT: subps %xmm1, %xmm3 -; SSE-NEXT: mulps %xmm2, %xmm3 -; SSE-NEXT: addps %xmm2, %xmm3 -; SSE-NEXT: mulps %xmm3, %xmm0 +; SSE-NEXT: movss {{.*#+}} xmm2 = mem[0],zero,zero,zero +; SSE-NEXT: divss %xmm1, %xmm2 +; SSE-NEXT: shufps {{.*#+}} xmm2 = xmm2[0,0,0,0] +; SSE-NEXT: mulps %xmm2, %xmm0 ; SSE-NEXT: retq ; ; AVX-LABEL: splat_fdiv_v4f32: ; AVX: # %bb.0: +; AVX-NEXT: vmovss {{.*#+}} xmm2 = mem[0],zero,zero,zero +; AVX-NEXT: vdivss %xmm1, %xmm2, %xmm1 ; AVX-NEXT: vpermilps {{.*#+}} xmm1 = xmm1[0,0,0,0] -; AVX-NEXT: vrcpps %xmm1, %xmm2 -; AVX-NEXT: vmulps %xmm2, %xmm1, %xmm1 -; AVX-NEXT: vmovaps {{.*#+}} xmm3 = [1.0E+0,1.0E+0,1.0E+0,1.0E+0] -; AVX-NEXT: vsubps %xmm1, %xmm3, %xmm1 -; AVX-NEXT: vmulps %xmm1, %xmm2, %xmm1 -; AVX-NEXT: vaddps %xmm1, %xmm2, %xmm1 ; AVX-NEXT: vmulps %xmm1, %xmm0, %xmm0 ; AVX-NEXT: retq %vy = insertelement <4 x float> undef, float %y, i32 0 @@ -90,14 +82,10 @@ define <8 x float> @splat_fdiv_v8f32(<8 x float> %x, float %y) { ; ; AVX-LABEL: splat_fdiv_v8f32: ; AVX: # %bb.0: +; AVX-NEXT: vmovss {{.*#+}} xmm2 = mem[0],zero,zero,zero +; AVX-NEXT: vdivss %xmm1, %xmm2, %xmm1 ; AVX-NEXT: vpermilps {{.*#+}} xmm1 = xmm1[0,0,0,0] ; AVX-NEXT: vinsertf128 $1, %xmm1, %ymm1, %ymm1 -; AVX-NEXT: vrcpps %ymm1, %ymm2 -; AVX-NEXT: vmulps %ymm2, %ymm1, %ymm1 -; AVX-NEXT: vmovaps {{.*#+}} ymm3 = [1.0E+0,1.0E+0,1.0E+0,1.0E+0,1.0E+0,1.0E+0,1.0E+0,1.0E+0] -; AVX-NEXT: vsubps %ymm1, %ymm3, %ymm1 -; AVX-NEXT: vmulps %ymm1, %ymm2, %ymm1 -; AVX-NEXT: vaddps %ymm1, %ymm2, %ymm1 ; AVX-NEXT: vmulps %ymm1, %ymm0, %ymm0 ; AVX-NEXT: retq %vy = insertelement <8 x float> undef, float %y, i32 0 @@ -109,25 +97,25 @@ define <8 x float> @splat_fdiv_v8f32(<8 x float> %x, float %y) { define <4 x float> @splat_fdiv_v4f32_estimate(<4 x float> %x, float %y) #0 { ; SSE-LABEL: splat_fdiv_v4f32_estimate: ; SSE: # %bb.0: -; SSE-NEXT: shufps {{.*#+}} xmm1 = xmm1[0,0,0,0] -; SSE-NEXT: rcpps %xmm1, %xmm2 -; SSE-NEXT: mulps %xmm2, %xmm1 -; SSE-NEXT: movaps {{.*#+}} xmm3 = [1.0E+0,1.0E+0,1.0E+0,1.0E+0] -; SSE-NEXT: subps %xmm1, %xmm3 -; SSE-NEXT: mulps %xmm2, %xmm3 -; SSE-NEXT: addps %xmm2, %xmm3 +; SSE-NEXT: rcpss %xmm1, %xmm2 +; SSE-NEXT: mulss %xmm2, %xmm1 +; SSE-NEXT: movss {{.*#+}} xmm3 = mem[0],zero,zero,zero +; SSE-NEXT: subss %xmm1, %xmm3 +; SSE-NEXT: mulss %xmm2, %xmm3 +; SSE-NEXT: addss %xmm2, %xmm3 +; SSE-NEXT: shufps {{.*#+}} xmm3 = xmm3[0,0,0,0] ; SSE-NEXT: mulps %xmm3, %xmm0 ; SSE-NEXT: retq ; ; AVX-LABEL: splat_fdiv_v4f32_estimate: ; AVX: # %bb.0: +; AVX-NEXT: vrcpss %xmm1, %xmm1, %xmm2 +; AVX-NEXT: vmulss %xmm2, %xmm1, %xmm1 +; AVX-NEXT: vmovss {{.*#+}} xmm3 = mem[0],zero,zero,zero +; AVX-NEXT: vsubss %xmm1, %xmm3, %xmm1 +; AVX-NEXT: vmulss %xmm1, %xmm2, %xmm1 +; AVX-NEXT: vaddss %xmm1, %xmm2, %xmm1 ; AVX-NEXT: vpermilps {{.*#+}} xmm1 = xmm1[0,0,0,0] -; AVX-NEXT: vrcpps %xmm1, %xmm2 -; AVX-NEXT: vmulps %xmm2, %xmm1, %xmm1 -; AVX-NEXT: vmovaps {{.*#+}} xmm3 = [1.0E+0,1.0E+0,1.0E+0,1.0E+0] -; AVX-NEXT: vsubps %xmm1, %xmm3, %xmm1 -; AVX-NEXT: vmulps %xmm1, %xmm2, %xmm1 -; AVX-NEXT: vaddps %xmm1, %xmm2, %xmm1 ; AVX-NEXT: vmulps %xmm1, %xmm0, %xmm0 ; AVX-NEXT: retq %vy = insertelement <4 x float> undef, float %y, i32 0 @@ -152,14 +140,14 @@ define <8 x float> @splat_fdiv_v8f32_estimate(<8 x float> %x, float %y) #0 { ; ; AVX-LABEL: splat_fdiv_v8f32_estimate: ; AVX: # %bb.0: +; AVX-NEXT: vrcpss %xmm1, %xmm1, %xmm2 +; AVX-NEXT: vmulss %xmm2, %xmm1, %xmm1 +; AVX-NEXT: vmovss {{.*#+}} xmm3 = mem[0],zero,zero,zero +; AVX-NEXT: vsubss %xmm1, %xmm3, %xmm1 +; AVX-NEXT: vmulss %xmm1, %xmm2, %xmm1 +; AVX-NEXT: vaddss %xmm1, %xmm2, %xmm1 ; AVX-NEXT: vpermilps {{.*#+}} xmm1 = xmm1[0,0,0,0] ; AVX-NEXT: vinsertf128 $1, %xmm1, %ymm1, %ymm1 -; AVX-NEXT: vrcpps %ymm1, %ymm2 -; AVX-NEXT: vmulps %ymm2, %ymm1, %ymm1 -; AVX-NEXT: vmovaps {{.*#+}} ymm3 = [1.0E+0,1.0E+0,1.0E+0,1.0E+0,1.0E+0,1.0E+0,1.0E+0,1.0E+0] -; AVX-NEXT: vsubps %ymm1, %ymm3, %ymm1 -; AVX-NEXT: vmulps %ymm1, %ymm2, %ymm1 -; AVX-NEXT: vaddps %ymm1, %ymm2, %ymm1 ; AVX-NEXT: vmulps %ymm1, %ymm0, %ymm0 ; AVX-NEXT: retq %vy = insertelement <8 x float> undef, float %y, i32 0