1 ; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py 2 ; RUN: llc < %s -mtriple=aarch64-none-linux-gnu -verify-machineinstrs | FileCheck %s 3 4 define double @test1(double %a, double %b) { 5 ; CHECK-LABEL: test1: 6 ; CHECK: // %bb.0: 7 ; CHECK-NEXT: fadd d1, d1, d1 8 ; CHECK-NEXT: fsub d0, d0, d1 9 ; CHECK-NEXT: ret 10 %mul = fmul double %b, -2.000000e+00 11 %add1 = fadd double %a, %mul 12 ret double %add1 13 } 14 15 ; DAGCombine will canonicalize 'a - 2.0*b' to 'a + -2.0*b' 16 17 define double @test2(double %a, double %b) { 18 ; CHECK-LABEL: test2: 19 ; CHECK: // %bb.0: 20 ; CHECK-NEXT: fadd d1, d1, d1 21 ; CHECK-NEXT: fsub d0, d0, d1 22 ; CHECK-NEXT: ret 23 %mul = fmul double %b, 2.000000e+00 24 %add1 = fsub double %a, %mul 25 ret double %add1 26 } 27 28 define double @test3(double %a, double %b, double %c) { 29 ; CHECK-LABEL: test3: 30 ; CHECK: // %bb.0: 31 ; CHECK-NEXT: fmul d0, d0, d1 32 ; CHECK-NEXT: fadd d1, d2, d2 33 ; CHECK-NEXT: fsub d0, d0, d1 34 ; CHECK-NEXT: ret 35 %mul = fmul double %a, %b 36 %mul1 = fmul double %c, 2.000000e+00 37 %sub = fsub double %mul, %mul1 38 ret double %sub 39 } 40 41 define double @test4(double %a, double %b, double %c) { 42 ; CHECK-LABEL: test4: 43 ; CHECK: // %bb.0: 44 ; CHECK-NEXT: fmul d0, d0, d1 45 ; CHECK-NEXT: fadd d1, d2, d2 46 ; CHECK-NEXT: fsub d0, d0, d1 47 ; CHECK-NEXT: ret 48 %mul = fmul double %a, %b 49 %mul1 = fmul double %c, -2.000000e+00 50 %add2 = fadd double %mul, %mul1 51 ret double %add2 52 } 53 54 define <4 x float> @test5(<4 x float> %a, <4 x float> %b) { 55 ; CHECK-LABEL: test5: 56 ; CHECK: // %bb.0: 57 ; CHECK-NEXT: fadd v1.4s, v1.4s, v1.4s 58 ; CHECK-NEXT: fsub v0.4s, v0.4s, v1.4s 59 ; CHECK-NEXT: ret 60 %mul = fmul <4 x float> %b, <float -2.0, float -2.0, float -2.0, float -2.0> 61 %add = fadd <4 x float> %a, %mul 62 ret <4 x float> %add 63 } 64 65 define <4 x float> @test6(<4 x float> %a, <4 x float> %b) { 66 ; CHECK-LABEL: test6: 67 ; CHECK: // %bb.0: 68 ; CHECK-NEXT: fadd v1.4s, v1.4s, v1.4s 69 ; CHECK-NEXT: fsub v0.4s, v0.4s, v1.4s 70 ; CHECK-NEXT: ret 71 %mul = fmul <4 x float> %b, <float 2.0, float 2.0, float 2.0, float 2.0> 72 %add = fsub <4 x float> %a, %mul 73 ret <4 x float> %add 74 } 75 76 ; Don't fold (fadd A, (fmul B, -2.0)) -> (fsub A, (fadd B, B)) if the fmul has 77 ; multiple uses. 78 79 define double @test7(double %a, double %b) nounwind { 80 ; CHECK-LABEL: test7: 81 ; CHECK: // %bb.0: 82 ; CHECK-NEXT: str d8, [sp, #-16]! // 8-byte Folded Spill 83 ; CHECK-NEXT: fmov d2, #-2.00000000 84 ; CHECK-NEXT: fmul d1, d1, d2 85 ; CHECK-NEXT: fadd d8, d0, d1 86 ; CHECK-NEXT: mov v0.16b, v1.16b 87 ; CHECK-NEXT: str x30, [sp, #8] // 8-byte Folded Spill 88 ; CHECK-NEXT: bl use 89 ; CHECK-NEXT: ldr x30, [sp, #8] // 8-byte Folded Reload 90 ; CHECK-NEXT: mov v0.16b, v8.16b 91 ; CHECK-NEXT: ldr d8, [sp], #16 // 8-byte Folded Reload 92 ; CHECK-NEXT: ret 93 %mul = fmul double %b, -2.000000e+00 94 %add1 = fadd double %a, %mul 95 call void @use(double %mul) 96 ret double %add1 97 } 98 99 define float @fadd_const_multiuse_fmf(float %x) { 100 ; CHECK-LABEL: fadd_const_multiuse_fmf: 101 ; CHECK: // %bb.0: 102 ; CHECK-NEXT: adrp x8, .LCPI7_0 103 ; CHECK-NEXT: adrp x9, .LCPI7_1 104 ; CHECK-NEXT: ldr s1, [x8, :lo12:.LCPI7_0] 105 ; CHECK-NEXT: ldr s2, [x9, :lo12:.LCPI7_1] 106 ; CHECK-NEXT: fadd s1, s0, s1 107 ; CHECK-NEXT: fadd s0, s0, s2 108 ; CHECK-NEXT: fadd s0, s1, s0 109 ; CHECK-NEXT: ret 110 %a1 = fadd float %x, 42.0 111 %a2 = fadd nsz reassoc float %a1, 17.0 112 %a3 = fadd float %a1, %a2 113 ret float %a3 114 } 115 116 ; DAGCombiner transforms this into: (x + 59.0) + (x + 17.0). 117 ; The machine combiner transforms this into a chain of 3 dependent adds: 118 ; ((x + 59.0) + 17.0) + x 119 120 define float @fadd_const_multiuse_attr(float %x) #0 { 121 ; CHECK-LABEL: fadd_const_multiuse_attr: 122 ; CHECK: // %bb.0: 123 ; CHECK-NEXT: adrp x9, .LCPI8_1 124 ; CHECK-NEXT: adrp x8, .LCPI8_0 125 ; CHECK-NEXT: ldr s1, [x9, :lo12:.LCPI8_1] 126 ; CHECK-NEXT: ldr s2, [x8, :lo12:.LCPI8_0] 127 ; CHECK-NEXT: fadd s1, s0, s1 128 ; CHECK-NEXT: fadd s1, s2, s1 129 ; CHECK-NEXT: fadd s0, s0, s1 130 ; CHECK-NEXT: ret 131 %a1 = fadd float %x, 42.0 132 %a2 = fadd float %a1, 17.0 133 %a3 = fadd float %a1, %a2 134 ret float %a3 135 } 136 137 attributes #0 = { "unsafe-fp-math"="true" } 138 139 declare void @use(double) 140 141
