test/CodeGen/AArch64/fdiv-combine.ll

; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
; RUN: llc -mtriple=aarch64-unknown-unknown < %s | FileCheck %s

; Following test cases check:
;   a / D; b / D; c / D;
;                =>
;   recip = 1.0 / D; a * recip; b * recip; c * recip;
define void @three_fdiv_float(float %D, float %a, float %b, float %c) #0 {
; CHECK-LABEL: three_fdiv_float:
; CHECK:       // %bb.0:
; CHECK-NEXT:    fmov s4, #1.00000000
; CHECK-NEXT:    fdiv s4, s4, s0
; CHECK-NEXT:    fmul s0, s1, s4
; CHECK-NEXT:    fmul s1, s2, s4
; CHECK-NEXT:    fmul s2, s3, s4
; CHECK-NEXT:    b foo_3f
  %div = fdiv float %a, %D
  %div1 = fdiv float %b, %D
  %div2 = fdiv float %c, %D
  tail call void @foo_3f(float %div, float %div1, float %div2)
  ret void
}

define void @three_fdiv_double(double %D, double %a, double %b, double %c) #0 {
; CHECK-LABEL: three_fdiv_double:
; CHECK:       // %bb.0:
; CHECK-NEXT:    fmov d4, #1.00000000
; CHECK-NEXT:    fdiv d4, d4, d0
; CHECK-NEXT:    fmul d0, d1, d4
; CHECK-NEXT:    fmul d1, d2, d4
; CHECK-NEXT:    fmul d2, d3, d4
; CHECK-NEXT:    b foo_3d
  %div = fdiv double %a, %D
  %div1 = fdiv double %b, %D
  %div2 = fdiv double %c, %D
  tail call void @foo_3d(double %div, double %div1, double %div2)
  ret void
}

define void @three_fdiv_4xfloat(<4 x float> %D, <4 x float> %a, <4 x float> %b, <4 x float> %c) #0 {
; CHECK-LABEL: three_fdiv_4xfloat:
; CHECK:       // %bb.0:
; CHECK-NEXT:    fmov v4.4s, #1.00000000
; CHECK-NEXT:    fdiv v4.4s, v4.4s, v0.4s
; CHECK-NEXT:    fmul v0.4s, v1.4s, v4.4s
; CHECK-NEXT:    fmul v1.4s, v2.4s, v4.4s
; CHECK-NEXT:    fmul v2.4s, v3.4s, v4.4s
; CHECK-NEXT:    b foo_3_4xf
  %div = fdiv <4 x float> %a, %D
  %div1 = fdiv <4 x float> %b, %D
  %div2 = fdiv <4 x float> %c, %D
  tail call void @foo_3_4xf(<4 x float> %div, <4 x float> %div1, <4 x float> %div2)
  ret void
}

define void @three_fdiv_2xdouble(<2 x double> %D, <2 x double> %a, <2 x double> %b, <2 x double> %c) #0 {
; CHECK-LABEL: three_fdiv_2xdouble:
; CHECK:       // %bb.0:
; CHECK-NEXT:    fmov v4.2d, #1.00000000
; CHECK-NEXT:    fdiv v4.2d, v4.2d, v0.2d
; CHECK-NEXT:    fmul v0.2d, v1.2d, v4.2d
; CHECK-NEXT:    fmul v1.2d, v2.2d, v4.2d
; CHECK-NEXT:    fmul v2.2d, v3.2d, v4.2d
; CHECK-NEXT:    b foo_3_2xd
  %div = fdiv <2 x double> %a, %D
  %div1 = fdiv <2 x double> %b, %D
  %div2 = fdiv <2 x double> %c, %D
  tail call void @foo_3_2xd(<2 x double> %div, <2 x double> %div1, <2 x double> %div2)
  ret void
}

; Following test cases check we never combine two FDIVs if neither of them
; calculates a reciprocal.
define void @two_fdiv_float(float %D, float %a, float %b) #0 {
; CHECK-LABEL: two_fdiv_float:
; CHECK:       // %bb.0:
; CHECK-NEXT:    fdiv s3, s1, s0
; CHECK-NEXT:    fdiv s1, s2, s0
; CHECK-NEXT:    fmov s0, s3
; CHECK-NEXT:    b foo_2f
  %div = fdiv float %a, %D
  %div1 = fdiv float %b, %D
  tail call void @foo_2f(float %div, float %div1)
  ret void
}

define void @two_fdiv_double(double %D, double %a, double %b) #0 {
; CHECK-LABEL: two_fdiv_double:
; CHECK:       // %bb.0:
; CHECK-NEXT:    fdiv d3, d1, d0
; CHECK-NEXT:    fdiv d1, d2, d0
; CHECK-NEXT:    fmov d0, d3
; CHECK-NEXT:    b foo_2d
  %div = fdiv double %a, %D
  %div1 = fdiv double %b, %D
  tail call void @foo_2d(double %div, double %div1)
  ret void
}

define void @splat_three_fdiv_4xfloat(float %D, <4 x float> %a, <4 x float> %b, <4 x float> %c) #0 {
; CHECK-LABEL: splat_three_fdiv_4xfloat:
; CHECK:       // %bb.0:
; CHECK-NEXT:    fmov v4.4s, #1.00000000
; CHECK-NEXT:    // kill: def $s0 killed $s0 def $q0
; CHECK-NEXT:    dup v0.4s, v0.s[0]
; CHECK-NEXT:    fdiv v4.4s, v4.4s, v0.4s
; CHECK-NEXT:    fmul v0.4s, v1.4s, v4.4s
; CHECK-NEXT:    fmul v1.4s, v2.4s, v4.4s
; CHECK-NEXT:    fmul v2.4s, v3.4s, v4.4s
; CHECK-NEXT:    b foo_3_4xf
  %D.ins = insertelement <4 x float> poison, float %D, i64 0
  %splat = shufflevector <4 x float> %D.ins, <4 x float> poison, <4 x i32> zeroinitializer
  %div = fdiv <4 x float> %a, %splat
  %div1 = fdiv <4 x float> %b, %splat
  %div2 = fdiv <4 x float> %c, %splat
  tail call void @foo_3_4xf(<4 x float> %div, <4 x float> %div1, <4 x float> %div2)
  ret void
}

define <4 x float> @splat_fdiv_v4f32(float %D, <4 x float> %a) #1 {
; CHECK-LABEL: splat_fdiv_v4f32:
; CHECK:       // %bb.0: // %entry
; CHECK-NEXT:    fmov v2.4s, #1.00000000
; CHECK-NEXT:    // kill: def $s0 killed $s0 def $q0
; CHECK-NEXT:    dup v0.4s, v0.s[0]
; CHECK-NEXT:    fdiv v0.4s, v2.4s, v0.4s
; CHECK-NEXT:    fmul v0.4s, v1.4s, v0.4s
; CHECK-NEXT:    ret
entry:
  %D.ins = insertelement <4 x float> poison, float %D, i64 0
  %splat = shufflevector <4 x float> %D.ins, <4 x float> poison, <4 x i32> zeroinitializer
  %div = fdiv <4 x float> %a, %splat
  ret <4 x float> %div
}

define <vscale x 4 x float> @splat_fdiv_nxv4f32(float %D, <vscale x 4 x float> %a) #1 {
; CHECK-LABEL: splat_fdiv_nxv4f32:
; CHECK:       // %bb.0: // %entry
; CHECK-NEXT:    fmov s2, #1.00000000
; CHECK-NEXT:    fdiv s0, s2, s0
; CHECK-NEXT:    mov z0.s, s0
; CHECK-NEXT:    fmul z0.s, z1.s, z0.s
; CHECK-NEXT:    ret
entry:
  %D.ins = insertelement <vscale x 4 x float> poison, float %D, i64 0
  %splat = shufflevector <vscale x 4 x float> %D.ins, <vscale x 4 x float> poison, <vscale x 4 x i32> zeroinitializer
  %div = fdiv <vscale x 4 x float> %a, %splat
  ret <vscale x 4 x float> %div
}

define void @splat_three_fdiv_nxv4f32(float %D, <vscale x 4 x float> %a, <vscale x 4 x float> %b, <vscale x 4 x float> %c) #1 {
; CHECK-LABEL: splat_three_fdiv_nxv4f32:
; CHECK:       // %bb.0: // %entry
; CHECK-NEXT:    fmov s4, #1.00000000
; CHECK-NEXT:    fdiv s0, s4, s0
; CHECK-NEXT:    mov z4.s, s0
; CHECK-NEXT:    fmul z0.s, z1.s, z4.s
; CHECK-NEXT:    fmul z1.s, z2.s, z4.s
; CHECK-NEXT:    fmul z2.s, z3.s, z4.s
; CHECK-NEXT:    b foo_3_nxv4f32
entry:
  %D.ins = insertelement <vscale x 4 x float> poison, float %D, i64 0
  %splat = shufflevector <vscale x 4 x float> %D.ins, <vscale x 4 x float> poison, <vscale x 4 x i32> zeroinitializer
  %div = fdiv <vscale x 4 x float> %a, %splat
  %div1 = fdiv <vscale x 4 x float> %b, %splat
  %div2 = fdiv <vscale x 4 x float> %c, %splat
  tail call void @foo_3_nxv4f32(<vscale x 4 x float> %div, <vscale x 4 x float> %div1, <vscale x 4 x float> %div2)
  ret void
}

define <vscale x 2 x double> @splat_fdiv_nxv2f64(double %D, <vscale x 2 x double> %a) #1 {
; CHECK-LABEL: splat_fdiv_nxv2f64:
; CHECK:       // %bb.0: // %entry
; CHECK-NEXT:    // kill: def $d0 killed $d0 def $z0
; CHECK-NEXT:    ptrue p0.d
; CHECK-NEXT:    mov z0.d, d0
; CHECK-NEXT:    fdivr z0.d, p0/m, z0.d, z1.d
; CHECK-NEXT:    ret
entry:
  %D.ins = insertelement <vscale x 2 x double> poison, double %D, i64 0
  %splat = shufflevector <vscale x 2 x double> %D.ins, <vscale x 2 x double> poison, <vscale x 2 x i32> zeroinitializer
  %div = fdiv <vscale x 2 x double> %a, %splat
  ret <vscale x 2 x double> %div
}

define void @splat_two_fdiv_nxv2f64(double %D, <vscale x 2 x double> %a, <vscale x 2 x double> %b) #1 {
; CHECK-LABEL: splat_two_fdiv_nxv2f64:
; CHECK:       // %bb.0: // %entry
; CHECK-NEXT:    fmov d3, #1.00000000
; CHECK-NEXT:    fdiv d0, d3, d0
; CHECK-NEXT:    mov z3.d, d0
; CHECK-NEXT:    fmul z0.d, z1.d, z3.d
; CHECK-NEXT:    fmul z1.d, z2.d, z3.d
; CHECK-NEXT:    b foo_2_nxv2f64
entry:
  %D.ins = insertelement <vscale x 2 x double> poison, double %D, i64 0
  %splat = shufflevector <vscale x 2 x double> %D.ins, <vscale x 2 x double> poison, <vscale x 2 x i32> zeroinitializer
  %div = fdiv <vscale x 2 x double> %a, %splat
  %div1 = fdiv <vscale x 2 x double> %b, %splat
  tail call void @foo_2_nxv2f64(<vscale x 2 x double> %div, <vscale x 2 x double> %div1)
  ret void
}

declare void @foo_3f(float, float, float)
declare void @foo_3d(double, double, double)
declare void @foo_3_4xf(<4 x float>, <4 x float>, <4 x float>)
declare void @foo_3_2xd(<2 x double>, <2 x double>, <2 x double>)
declare void @foo_2f(float, float)
declare void @foo_2d(double, double)
declare void @foo_3_nxv4f32(<vscale x 4 x float>, <vscale x 4 x float>, <vscale x 4 x float>)
declare void @foo_2_nxv2f64(<vscale x 2 x double>, <vscale x 2 x double>)

attributes #0 = { "unsafe-fp-math"="true" }
attributes #1 = { "unsafe-fp-math"="true" "target-features"="+sve" }