1 ; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py 2 ; RUN: llc < %s -mtriple=x86_64-unknown | FileCheck %s -check-prefix=X64 3 ; RUN: llc < %s -mtriple=i686-unknown | FileCheck %s -check-prefix=X86 4 5 declare float @llvm.sqrt.f32(float %x); 6 7 define float @fast_recip_sqrt(float %x) { 8 ; X64-LABEL: fast_recip_sqrt: 9 ; X64: # %bb.0: 10 ; X64-NEXT: rsqrtss %xmm0, %xmm1 11 ; X64-NEXT: mulss %xmm1, %xmm0 12 ; X64-NEXT: mulss %xmm1, %xmm0 13 ; X64-NEXT: addss {{.*}}(%rip), %xmm0 14 ; X64-NEXT: mulss {{.*}}(%rip), %xmm1 15 ; X64-NEXT: mulss %xmm1, %xmm0 16 ; X64-NEXT: retq 17 ; 18 ; X86-LABEL: fast_recip_sqrt: 19 ; X86: # %bb.0: 20 ; X86-NEXT: flds {{[0-9]+}}(%esp) 21 ; X86-NEXT: fsqrt 22 ; X86-NEXT: fld1 23 ; X86-NEXT: fdivp %st(1) 24 ; X86-NEXT: retl 25 %y = call fast float @llvm.sqrt.f32(float %x) 26 %z = fdiv fast float 1.0, %y 27 ret float %z 28 } 29 30 declare float @llvm.fmuladd.f32(float %a, float %b, float %c); 31 32 define float @fast_fmuladd_opts(float %a , float %b , float %c) { 33 ; X64-LABEL: fast_fmuladd_opts: 34 ; X64: # %bb.0: 35 ; X64-NEXT: mulss {{.*}}(%rip), %xmm0 36 ; X64-NEXT: retq 37 ; 38 ; X86-LABEL: fast_fmuladd_opts: 39 ; X86: # %bb.0: 40 ; X86-NEXT: flds {{[0-9]+}}(%esp) 41 ; X86-NEXT: fmuls {{.*}} 42 ; X86-NEXT: retl 43 %res = call fast float @llvm.fmuladd.f32(float %a, float 2.0, float %a) 44 ret float %res 45 } 46 47 ; The multiply is strict. 48 49 @mul1 = common global double 0.000000e+00, align 4 50 51 define double @not_so_fast_mul_add(double %x) { 52 ; X64-LABEL: not_so_fast_mul_add: 53 ; X64: # %bb.0: 54 ; X64-NEXT: movsd {{.*}}(%rip), %xmm1 55 ; X64-NEXT: mulsd %xmm0, %xmm1 56 ; X64-NEXT: mulsd {{.*}}(%rip), %xmm0 57 ; X64-NEXT: movsd %xmm1, {{.*}}(%rip) 58 ; X64-NEXT: retq 59 ; 60 ; X86-LABEL: not_so_fast_mul_add: 61 ; X86: # %bb.0: 62 ; X86-NEXT: fldl {{[0-9]+}}(%esp) 63 ; X86-NEXT: fld %st(0) 64 ; X86-NEXT: fmull {{\.LCPI.*}} 65 ; X86-NEXT: fxch %st(1) 66 ; X86-NEXT: fmull {{\.LCPI.*}} 67 ; X86-NEXT: fxch %st(1) 68 ; X86-NEXT: fstpl mul1 69 ; X86-NEXT: retl 70 %m = fmul double %x, 4.2 71 %a = fadd fast double %m, %x 72 store double %m, double* @mul1, align 4 73 ret double %a 74 } 75 76 ; The sqrt is strict. 77 78 @sqrt1 = common global float 0.000000e+00, align 4 79 80 define float @not_so_fast_recip_sqrt(float %x) { 81 ; X64-LABEL: not_so_fast_recip_sqrt: 82 ; X64: # %bb.0: 83 ; X64-NEXT: rsqrtss %xmm0, %xmm1 84 ; X64-NEXT: sqrtss %xmm0, %xmm2 85 ; X64-NEXT: mulss %xmm1, %xmm0 86 ; X64-NEXT: mulss %xmm1, %xmm0 87 ; X64-NEXT: addss {{.*}}(%rip), %xmm0 88 ; X64-NEXT: mulss {{.*}}(%rip), %xmm1 89 ; X64-NEXT: mulss %xmm1, %xmm0 90 ; X64-NEXT: movss %xmm2, sqrt1(%rip) 91 ; X64-NEXT: retq 92 ; 93 ; X86-LABEL: not_so_fast_recip_sqrt: 94 ; X86: # %bb.0: 95 ; X86-NEXT: flds {{[0-9]+}}(%esp) 96 ; X86-NEXT: fsqrt 97 ; X86-NEXT: fld1 98 ; X86-NEXT: fdiv %st(1) 99 ; X86-NEXT: fxch %st(1) 100 ; X86-NEXT: fstps sqrt1 101 ; X86-NEXT: retl 102 %y = call float @llvm.sqrt.f32(float %x) 103 %z = fdiv fast float 1.0, %y 104 store float %y, float* @sqrt1, align 4 105 %ret = fadd float %z , 14.5 106 ret float %z 107 } 108 109 define float @div_arcp_by_const(half %x) { 110 ; X64-LABEL: .LCPI4_0: 111 ; X64-NEXT: .long 1036828672 112 ; X64-LABEL: div_arcp_by_const: 113 ; X64: movzwl %ax, %edi 114 ; X64: mulss .LCPI4_0(%rip), %xmm0 115 ; 116 ; X86-LABEL: .LCPI4_0: 117 ; X86-NEXT: .long 1036828672 118 ; X86-LABEL: div_arcp_by_const: 119 ; X86: movzwl %ax, %eax 120 ; X86: fmuls .LCPI4_0 121 %rcp = fdiv arcp half %x, 10.0 122 %z = fpext half %rcp to float 123 ret float %z 124 } 125
