1 ; RUN: opt < %s -instcombine -S | not grep fpext 2 @X = external global float 3 @Y = external global float 4 5 define void @test() nounwind { 6 entry: 7 %tmp = load float* @X, align 4 ; <float> [#uses=1] 8 %tmp1 = fpext float %tmp to double ; <double> [#uses=1] 9 %tmp3 = fadd double %tmp1, 0.000000e+00 ; <double> [#uses=1] 10 %tmp34 = fptrunc double %tmp3 to float ; <float> [#uses=1] 11 store float %tmp34, float* @X, align 4 12 ret void 13 } 14 15 define void @test3() nounwind { 16 entry: 17 %tmp = load float* @X, align 4 ; <float> [#uses=1] 18 %tmp1 = fpext float %tmp to double ; <double> [#uses=1] 19 %tmp2 = load float* @Y, align 4 ; <float> [#uses=1] 20 %tmp23 = fpext float %tmp2 to double ; <double> [#uses=1] 21 %tmp5 = fdiv double %tmp1, %tmp23 ; <double> [#uses=1] 22 %tmp56 = fptrunc double %tmp5 to float ; <float> [#uses=1] 23 store float %tmp56, float* @X, align 4 24 ret void 25 } 26 27 define void @test4() nounwind { 28 entry: 29 %tmp = load float* @X, align 4 ; <float> [#uses=1] 30 %tmp1 = fpext float %tmp to double ; <double> [#uses=1] 31 %tmp2 = fsub double -0.000000e+00, %tmp1 ; <double> [#uses=1] 32 %tmp34 = fptrunc double %tmp2 to float ; <float> [#uses=1] 33 store float %tmp34, float* @X, align 4 34 ret void 35 } 36 37
