forked from OSchip/llvm-project
114 lines
3.2 KiB
LLVM
114 lines
3.2 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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; RUN: llc < %s -mtriple=x86_64-unknown | FileCheck %s -check-prefix=X64
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; RUN: llc < %s -mtriple=i686-unknown | FileCheck %s -check-prefix=X86
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declare float @llvm.sqrt.f32(float %x);
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define float @fast_recip_sqrt(float %x) {
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; X64-LABEL: fast_recip_sqrt:
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; X64: # %bb.0:
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; X64-NEXT: rsqrtss %xmm0, %xmm1
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; X64-NEXT: xorps %xmm2, %xmm2
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; X64-NEXT: cmpeqss %xmm0, %xmm2
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; X64-NEXT: mulss %xmm1, %xmm0
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; X64-NEXT: movss {{.*}}(%rip), %xmm3
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; X64-NEXT: mulss %xmm0, %xmm3
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; X64-NEXT: mulss %xmm1, %xmm0
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; X64-NEXT: addss {{.*}}(%rip), %xmm0
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; X64-NEXT: mulss %xmm3, %xmm0
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; X64-NEXT: andnps %xmm0, %xmm2
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; X64-NEXT: movss {{.*}}(%rip), %xmm0
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; X64-NEXT: divss %xmm2, %xmm0
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; X64-NEXT: retq
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;
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; X86-LABEL: fast_recip_sqrt:
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; X86: # %bb.0:
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; X86-NEXT: flds {{[0-9]+}}(%esp)
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; X86-NEXT: fsqrt
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; X86-NEXT: fld1
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; X86-NEXT: fdivp %st(1)
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; X86-NEXT: retl
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%y = call fast float @llvm.sqrt.f32(float %x)
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%z = fdiv fast float 1.0, %y
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ret float %z
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}
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declare float @llvm.fmuladd.f32(float %a, float %b, float %c);
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define float @fast_fmuladd_opts(float %a , float %b , float %c) {
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; X64-LABEL: fast_fmuladd_opts:
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; X64: # %bb.0:
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; X64-NEXT: movaps %xmm0, %xmm1
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; X64-NEXT: addss %xmm0, %xmm1
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; X64-NEXT: addss %xmm0, %xmm1
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; X64-NEXT: movaps %xmm1, %xmm0
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; X64-NEXT: retq
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;
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; X86-LABEL: fast_fmuladd_opts:
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; X86: # %bb.0:
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; X86-NEXT: flds {{[0-9]+}}(%esp)
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; X86-NEXT: fld %st(0)
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; X86-NEXT: fadd %st(1)
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; X86-NEXT: faddp %st(1)
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; X86-NEXT: retl
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%res = call fast float @llvm.fmuladd.f32(float %a, float 2.0, float %a)
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ret float %res
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}
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; The multiply is strict.
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@mul1 = common global double 0.000000e+00, align 4
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define double @not_so_fast_mul_add(double %x) {
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; X64-LABEL: not_so_fast_mul_add:
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; X64: # %bb.0:
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; X64-NEXT: movsd {{.*#+}} xmm1 = mem[0],zero
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; X64-NEXT: mulsd %xmm0, %xmm1
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; X64-NEXT: addsd %xmm1, %xmm0
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; X64-NEXT: movsd %xmm1, {{.*}}(%rip)
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; X64-NEXT: retq
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;
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; X86-LABEL: not_so_fast_mul_add:
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; X86: # %bb.0:
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; X86-NEXT: fldl {{[0-9]+}}(%esp)
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; X86-NEXT: fld %st(0)
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; X86-NEXT: fmull {{\.LCPI.*}}
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; X86-NEXT: fadd %st(0), %st(1)
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; X86-NEXT: fstpl mul1
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; X86-NEXT: retl
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%m = fmul double %x, 4.2
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%a = fadd fast double %m, %x
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store double %m, double* @mul1, align 4
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ret double %a
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}
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; The sqrt is strict.
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@sqrt1 = common global float 0.000000e+00, align 4
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define float @not_so_fast_recip_sqrt(float %x) {
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; X64-LABEL: not_so_fast_recip_sqrt:
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; X64: # %bb.0:
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; X64-NEXT: sqrtss %xmm0, %xmm1
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; X64-NEXT: movss {{.*#+}} xmm0 = mem[0],zero,zero,zero
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; X64-NEXT: divss %xmm1, %xmm0
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; X64-NEXT: movss %xmm1, {{.*}}(%rip)
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; X64-NEXT: retq
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;
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; X86-LABEL: not_so_fast_recip_sqrt:
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; X86: # %bb.0:
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; X86-NEXT: flds {{[0-9]+}}(%esp)
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; X86-NEXT: fsqrt
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; X86-NEXT: fld1
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; X86-NEXT: fdiv %st(1)
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; X86-NEXT: fxch %st(1)
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; X86-NEXT: fstps sqrt1
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; X86-NEXT: retl
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%y = call float @llvm.sqrt.f32(float %x)
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%z = fdiv fast float 1.0, %y
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store float %y, float* @sqrt1, align 4
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%ret = fadd float %z , 14.5
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ret float %z
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}
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