test/Transforms/LoopVectorize/ARM/arm-ieee-vectorize.ll

; RUN: opt -mtriple armv7-linux-gnueabihf -loop-vectorize -S %s -debug-only=loop-vectorize -o /dev/null 2>&1 | FileCheck %s --check-prefix=CHECK --check-prefix=LINUX
; RUN: opt -mtriple armv8-linux-gnu -loop-vectorize -S %s -debug-only=loop-vectorize -o /dev/null 2>&1 | FileCheck %s --check-prefix=CHECK --check-prefix=LINUX
; RUN: opt -mtriple armv7-unknwon-darwin -loop-vectorize -S %s -debug-only=loop-vectorize -o /dev/null 2>&1 | FileCheck %s --check-prefix=CHECK --check-prefix=DARWIN
; REQUIRES: asserts

; Testing the ability of the loop vectorizer to tell when SIMD is safe or not
; regarding IEEE 754 standard.
; On Linux, we only want the vectorizer to work when -ffast-math flag is set,
; because NEON is not IEEE compliant.
; Darwin, on the other hand, doesn't support subnormals, and all optimizations
; are allowed, even without -ffast-math.

; Integer loops are always vectorizeable
; CHECK: Checking a loop in "sumi"
; CHECK: We can vectorize this loop!
define void @sumi(i32* noalias nocapture readonly %A, i32* noalias nocapture readonly %B, i32* noalias nocapture %C, i32 %N) {
entry:
  %cmp5 = icmp eq i32 %N, 0
  br i1 %cmp5, label %for.end, label %for.body.preheader

for.body.preheader:                               ; preds = %entry
  br label %for.body

for.body:                                         ; preds = %for.body.preheader, %for.body
  %i.06 = phi i32 [ %inc, %for.body ], [ 0, %for.body.preheader ]
  %arrayidx = getelementptr inbounds i32, i32* %A, i32 %i.06
  %0 = load i32, i32* %arrayidx, align 4
  %arrayidx1 = getelementptr inbounds i32, i32* %B, i32 %i.06
  %1 = load i32, i32* %arrayidx1, align 4
  %mul = mul nsw i32 %1, %0
  %arrayidx2 = getelementptr inbounds i32, i32* %C, i32 %i.06
  store i32 %mul, i32* %arrayidx2, align 4
  %inc = add nuw nsw i32 %i.06, 1
  %exitcond = icmp eq i32 %inc, %N
  br i1 %exitcond, label %for.end.loopexit, label %for.body

for.end.loopexit:                                 ; preds = %for.body
  br label %for.end

for.end:                                          ; preds = %for.end.loopexit, %entry
  ret void
}

; Floating-point loops need fast-math to be vectorizeable
; LINUX: Checking a loop in "sumf"
; LINUX: Potentially unsafe FP op prevents vectorization
; DARWIN: Checking a loop in "sumf"
; DARWIN: We can vectorize this loop!
define void @sumf(float* noalias nocapture readonly %A, float* noalias nocapture readonly %B, float* noalias nocapture %C, i32 %N) {
entry:
  %cmp5 = icmp eq i32 %N, 0
  br i1 %cmp5, label %for.end, label %for.body.preheader

for.body.preheader:                               ; preds = %entry
  br label %for.body

for.body:                                         ; preds = %for.body.preheader, %for.body
  %i.06 = phi i32 [ %inc, %for.body ], [ 0, %for.body.preheader ]
  %arrayidx = getelementptr inbounds float, float* %A, i32 %i.06
  %0 = load float, float* %arrayidx, align 4
  %arrayidx1 = getelementptr inbounds float, float* %B, i32 %i.06
  %1 = load float, float* %arrayidx1, align 4
  %mul = fmul float %0, %1
  %arrayidx2 = getelementptr inbounds float, float* %C, i32 %i.06
  store float %mul, float* %arrayidx2, align 4
  %inc = add nuw nsw i32 %i.06, 1
  %exitcond = icmp eq i32 %inc, %N
  br i1 %exitcond, label %for.end.loopexit, label %for.body

for.end.loopexit:                                 ; preds = %for.body
  br label %for.end

for.end:                                          ; preds = %for.end.loopexit, %entry
  ret void
}

; Integer loops are always vectorizeable
; CHECK: Checking a loop in "redi"
; CHECK: We can vectorize this loop!
define i32 @redi(i32* noalias nocapture readonly %a, i32* noalias nocapture readonly %b, i32 %N) {
entry:
  %cmp5 = icmp eq i32 %N, 0
  br i1 %cmp5, label %for.end, label %for.body.preheader

for.body.preheader:                               ; preds = %entry
  br label %for.body

for.body:                                         ; preds = %for.body.preheader, %for.body
  %i.07 = phi i32 [ %inc, %for.body ], [ 0, %for.body.preheader ]
  %Red.06 = phi i32 [ %add, %for.body ], [ undef, %for.body.preheader ]
  %arrayidx = getelementptr inbounds i32, i32* %a, i32 %i.07
  %0 = load i32, i32* %arrayidx, align 4
  %arrayidx1 = getelementptr inbounds i32, i32* %b, i32 %i.07
  %1 = load i32, i32* %arrayidx1, align 4
  %mul = mul nsw i32 %1, %0
  %add = add nsw i32 %mul, %Red.06
  %inc = add nuw nsw i32 %i.07, 1
  %exitcond = icmp eq i32 %inc, %N
  br i1 %exitcond, label %for.end.loopexit, label %for.body

for.end.loopexit:                                 ; preds = %for.body
  %add.lcssa = phi i32 [ %add, %for.body ]
  br label %for.end

for.end:                                          ; preds = %for.end.loopexit, %entry
  %Red.0.lcssa = phi i32 [ undef, %entry ], [ %add.lcssa, %for.end.loopexit ]
  ret i32 %Red.0.lcssa
}

; Floating-point loops need fast-math to be vectorizeable
; LINUX: Checking a loop in "redf"
; LINUX: Potentially unsafe FP op prevents vectorization
; DARWIN: Checking a loop in "redf"
; DARWIN: We can vectorize this loop!
define float @redf(float* noalias nocapture readonly %a, float* noalias nocapture readonly %b, i32 %N) {
entry:
  %cmp5 = icmp eq i32 %N, 0
  br i1 %cmp5, label %for.end, label %for.body.preheader

for.body.preheader:                               ; preds = %entry
  br label %for.body

for.body:                                         ; preds = %for.body.preheader, %for.body
  %i.07 = phi i32 [ %inc, %for.body ], [ 0, %for.body.preheader ]
  %Red.06 = phi float [ %add, %for.body ], [ undef, %for.body.preheader ]
  %arrayidx = getelementptr inbounds float, float* %a, i32 %i.07
  %0 = load float, float* %arrayidx, align 4
  %arrayidx1 = getelementptr inbounds float, float* %b, i32 %i.07
  %1 = load float, float* %arrayidx1, align 4
  %mul = fmul float %0, %1
  %add = fadd float %Red.06, %mul
  %inc = add nuw nsw i32 %i.07, 1
  %exitcond = icmp eq i32 %inc, %N
  br i1 %exitcond, label %for.end.loopexit, label %for.body

for.end.loopexit:                                 ; preds = %for.body
  %add.lcssa = phi float [ %add, %for.body ]
  br label %for.end

for.end:                                          ; preds = %for.end.loopexit, %entry
  %Red.0.lcssa = phi float [ undef, %entry ], [ %add.lcssa, %for.end.loopexit ]
  ret float %Red.0.lcssa
}

; Make sure calls that turn into builtins are also covered
; LINUX: Checking a loop in "fabs"
; LINUX: Potentially unsafe FP op prevents vectorization
; DARWIN: Checking a loop in "fabs"
; DARWIN: We can vectorize this loop!
define void @fabs(float* noalias nocapture readonly %A, float* noalias nocapture readonly %B, float* noalias nocapture %C, i32 %N) {
entry:
  %cmp10 = icmp eq i32 %N, 0
  br i1 %cmp10, label %for.end, label %for.body

for.body:                                         ; preds = %entry, %for.body
  %i.011 = phi i32 [ %inc, %for.body ], [ 0, %entry ]
  %arrayidx = getelementptr inbounds float, float* %A, i32 %i.011
  %0 = load float, float* %arrayidx, align 4
  %arrayidx1 = getelementptr inbounds float, float* %B, i32 %i.011
  %1 = load float, float* %arrayidx1, align 4
  %fabsf = tail call float @fabsf(float %1) #1
  %conv3 = fmul float %0, %fabsf
  %arrayidx4 = getelementptr inbounds float, float* %C, i32 %i.011
  store float %conv3, float* %arrayidx4, align 4
  %inc = add nuw nsw i32 %i.011, 1
  %exitcond = icmp eq i32 %inc, %N
  br i1 %exitcond, label %for.end, label %for.body

for.end:                                          ; preds = %for.body, %entry
  ret void
}

; Integer loops are always vectorizeable
; CHECK: Checking a loop in "sumi_fast"
; CHECK: We can vectorize this loop!
define void @sumi_fast(i32* noalias nocapture readonly %A, i32* noalias nocapture readonly %B, i32* noalias nocapture %C, i32 %N) {
entry:
  %cmp5 = icmp eq i32 %N, 0
  br i1 %cmp5, label %for.end, label %for.body.preheader

for.body.preheader:                               ; preds = %entry
  br label %for.body

for.body:                                         ; preds = %for.body.preheader, %for.body
  %i.06 = phi i32 [ %inc, %for.body ], [ 0, %for.body.preheader ]
  %arrayidx = getelementptr inbounds i32, i32* %A, i32 %i.06
  %0 = load i32, i32* %arrayidx, align 4
  %arrayidx1 = getelementptr inbounds i32, i32* %B, i32 %i.06
  %1 = load i32, i32* %arrayidx1, align 4
  %mul = mul nsw i32 %1, %0
  %arrayidx2 = getelementptr inbounds i32, i32* %C, i32 %i.06
  store i32 %mul, i32* %arrayidx2, align 4
  %inc = add nuw nsw i32 %i.06, 1
  %exitcond = icmp eq i32 %inc, %N
  br i1 %exitcond, label %for.end.loopexit, label %for.body

for.end.loopexit:                                 ; preds = %for.body
  br label %for.end

for.end:                                          ; preds = %for.end.loopexit, %entry
  ret void
}

; Floating-point loops can be vectorizeable with fast-math
; CHECK: Checking a loop in "sumf_fast"
; CHECK: We can vectorize this loop!
define void @sumf_fast(float* noalias nocapture readonly %A, float* noalias nocapture readonly %B, float* noalias nocapture %C, i32 %N) {
entry:
  %cmp5 = icmp eq i32 %N, 0
  br i1 %cmp5, label %for.end, label %for.body.preheader

for.body.preheader:                               ; preds = %entry
  br label %for.body

for.body:                                         ; preds = %for.body.preheader, %for.body
  %i.06 = phi i32 [ %inc, %for.body ], [ 0, %for.body.preheader ]
  %arrayidx = getelementptr inbounds float, float* %A, i32 %i.06
  %0 = load float, float* %arrayidx, align 4
  %arrayidx1 = getelementptr inbounds float, float* %B, i32 %i.06
  %1 = load float, float* %arrayidx1, align 4
  %mul = fmul fast float %1, %0
  %arrayidx2 = getelementptr inbounds float, float* %C, i32 %i.06
  store float %mul, float* %arrayidx2, align 4
  %inc = add nuw nsw i32 %i.06, 1
  %exitcond = icmp eq i32 %inc, %N
  br i1 %exitcond, label %for.end.loopexit, label %for.body

for.end.loopexit:                                 ; preds = %for.body
  br label %for.end

for.end:                                          ; preds = %for.end.loopexit, %entry
  ret void
}

; Integer loops are always vectorizeable
; CHECK: Checking a loop in "redi_fast"
; CHECK: We can vectorize this loop!
define i32 @redi_fast(i32* noalias nocapture readonly %a, i32* noalias nocapture readonly %b, i32 %N) {
entry:
  %cmp5 = icmp eq i32 %N, 0
  br i1 %cmp5, label %for.end, label %for.body.preheader

for.body.preheader:                               ; preds = %entry
  br label %for.body

for.body:                                         ; preds = %for.body.preheader, %for.body
  %i.07 = phi i32 [ %inc, %for.body ], [ 0, %for.body.preheader ]
  %Red.06 = phi i32 [ %add, %for.body ], [ undef, %for.body.preheader ]
  %arrayidx = getelementptr inbounds i32, i32* %a, i32 %i.07
  %0 = load i32, i32* %arrayidx, align 4
  %arrayidx1 = getelementptr inbounds i32, i32* %b, i32 %i.07
  %1 = load i32, i32* %arrayidx1, align 4
  %mul = mul nsw i32 %1, %0
  %add = add nsw i32 %mul, %Red.06
  %inc = add nuw nsw i32 %i.07, 1
  %exitcond = icmp eq i32 %inc, %N
  br i1 %exitcond, label %for.end.loopexit, label %for.body

for.end.loopexit:                                 ; preds = %for.body
  %add.lcssa = phi i32 [ %add, %for.body ]
  br label %for.end

for.end:                                          ; preds = %for.end.loopexit, %entry
  %Red.0.lcssa = phi i32 [ undef, %entry ], [ %add.lcssa, %for.end.loopexit ]
  ret i32 %Red.0.lcssa
}

; Floating-point loops can be vectorizeable with fast-math
; CHECK: Checking a loop in "redf_fast"
; CHECK: We can vectorize this loop!
define float @redf_fast(float* noalias nocapture readonly %a, float* noalias nocapture readonly %b, i32 %N) {
entry:
  %cmp5 = icmp eq i32 %N, 0
  br i1 %cmp5, label %for.end, label %for.body.preheader

for.body.preheader:                               ; preds = %entry
  br label %for.body

for.body:                                         ; preds = %for.body.preheader, %for.body
  %i.07 = phi i32 [ %inc, %for.body ], [ 0, %for.body.preheader ]
  %Red.06 = phi float [ %add, %for.body ], [ undef, %for.body.preheader ]
  %arrayidx = getelementptr inbounds float, float* %a, i32 %i.07
  %0 = load float, float* %arrayidx, align 4
  %arrayidx1 = getelementptr inbounds float, float* %b, i32 %i.07
  %1 = load float, float* %arrayidx1, align 4
  %mul = fmul fast float %1, %0
  %add = fadd fast float %mul, %Red.06
  %inc = add nuw nsw i32 %i.07, 1
  %exitcond = icmp eq i32 %inc, %N
  br i1 %exitcond, label %for.end.loopexit, label %for.body

for.end.loopexit:                                 ; preds = %for.body
  %add.lcssa = phi float [ %add, %for.body ]
  br label %for.end

for.end:                                          ; preds = %for.end.loopexit, %entry
  %Red.0.lcssa = phi float [ undef, %entry ], [ %add.lcssa, %for.end.loopexit ]
  ret float %Red.0.lcssa
}

; Make sure calls that turn into builtins are also covered
; CHECK: Checking a loop in "fabs_fast"
; CHECK: We can vectorize this loop!
define void @fabs_fast(float* noalias nocapture readonly %A, float* noalias nocapture readonly %B, float* noalias nocapture %C, i32 %N) {
entry:
  %cmp10 = icmp eq i32 %N, 0
  br i1 %cmp10, label %for.end, label %for.body

for.body:                                         ; preds = %entry, %for.body
  %i.011 = phi i32 [ %inc, %for.body ], [ 0, %entry ]
  %arrayidx = getelementptr inbounds float, float* %A, i32 %i.011
  %0 = load float, float* %arrayidx, align 4
  %arrayidx1 = getelementptr inbounds float, float* %B, i32 %i.011
  %1 = load float, float* %arrayidx1, align 4
  %fabsf = tail call fast float @fabsf(float %1) #2
  %conv3 = fmul fast float %fabsf, %0
  %arrayidx4 = getelementptr inbounds float, float* %C, i32 %i.011
  store float %conv3, float* %arrayidx4, align 4
  %inc = add nuw nsw i32 %i.011, 1
  %exitcond = icmp eq i32 %inc, %N
  br i1 %exitcond, label %for.end, label %for.body

for.end:                                          ; preds = %for.body, %entry
  ret void
}

declare float @fabsf(float)

attributes #1 = { nounwind readnone "disable-tail-calls"="false" "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="cortex-a8" "target-features"="+dsp,+neon,+vfp3" "unsafe-fp-math"="false" "use-soft-float"="false" }
attributes #2 = { nounwind readnone "disable-tail-calls"="false" "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="true" "no-nans-fp-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="cortex-a8" "target-features"="+dsp,+neon,+vfp3" "unsafe-fp-math"="true" "use-soft-float"="false" }