| ; RUN: opt < %s -O3 -simplifycfg -keep-loops=false -mcpu=core-avx2 -mtriple=x86_64-unknown-linux-gnu -S | FileCheck --check-prefix AUTO_VEC %s |
| |
| ; This test checks auto-vectorization with FP induction variable. |
| ; The FP operation is not "fast" and requires "fast-math" function attribute. |
| |
| ;void fp_iv_loop1(float * __restrict__ A, int N) { |
| ; float x = 1.0; |
| ; for (int i=0; i < N; ++i) { |
| ; A[i] = x; |
| ; x += 0.5; |
| ; } |
| ;} |
| |
| |
| ; AUTO_VEC-LABEL: @fp_iv_loop1( |
| ; AUTO_VEC: vector.body |
| ; AUTO_VEC: store <8 x float> |
| |
| define void @fp_iv_loop1(float* noalias nocapture %A, i32 %N) #0 { |
| entry: |
| %cmp4 = icmp sgt i32 %N, 0 |
| br i1 %cmp4, label %for.body.preheader, label %for.end |
| |
| for.body.preheader: ; preds = %entry |
| br label %for.body |
| |
| for.body: ; preds = %for.body.preheader, %for.body |
| %indvars.iv = phi i64 [ %indvars.iv.next, %for.body ], [ 0, %for.body.preheader ] |
| %x.06 = phi float [ %conv1, %for.body ], [ 1.000000e+00, %for.body.preheader ] |
| %arrayidx = getelementptr inbounds float, float* %A, i64 %indvars.iv |
| store float %x.06, float* %arrayidx, align 4 |
| %conv1 = fadd float %x.06, 5.000000e-01 |
| %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1 |
| %lftr.wideiv = trunc i64 %indvars.iv.next to i32 |
| %exitcond = icmp eq i32 %lftr.wideiv, %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 |
| } |
| |
| ; The same as the previous, FP operation is not fast, different function attribute |
| ; Vectorization should be rejected. |
| ;void fp_iv_loop2(float * __restrict__ A, int N) { |
| ; float x = 1.0; |
| ; for (int i=0; i < N; ++i) { |
| ; A[i] = x; |
| ; x += 0.5; |
| ; } |
| ;} |
| |
| ; AUTO_VEC-LABEL: @fp_iv_loop2( |
| ; AUTO_VEC-NOT: vector.body |
| ; AUTO_VEC-NOT: store <{{.*}} x float> |
| |
| define void @fp_iv_loop2(float* noalias nocapture %A, i32 %N) #1 { |
| entry: |
| %cmp4 = icmp sgt i32 %N, 0 |
| br i1 %cmp4, label %for.body.preheader, label %for.end |
| |
| for.body.preheader: ; preds = %entry |
| br label %for.body |
| |
| for.body: ; preds = %for.body.preheader, %for.body |
| %indvars.iv = phi i64 [ %indvars.iv.next, %for.body ], [ 0, %for.body.preheader ] |
| %x.06 = phi float [ %conv1, %for.body ], [ 1.000000e+00, %for.body.preheader ] |
| %arrayidx = getelementptr inbounds float, float* %A, i64 %indvars.iv |
| store float %x.06, float* %arrayidx, align 4 |
| %conv1 = fadd float %x.06, 5.000000e-01 |
| %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1 |
| %lftr.wideiv = trunc i64 %indvars.iv.next to i32 |
| %exitcond = icmp eq i32 %lftr.wideiv, %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 |
| } |
| |
| ; AUTO_VEC-LABEL: @external_use_with_fast_math( |
| ; AUTO_VEC-NEXT: entry: |
| ; AUTO_VEC-NEXT: [[TMP0:%.*]] = icmp sgt i64 %n, 1 |
| ; AUTO_VEC-NEXT: [[SMAX:%.*]] = select i1 [[TMP0]], i64 %n, i64 1 |
| ; AUTO_VEC: br i1 {{.*}}, label %for.body, label %vector.ph |
| ; AUTO_VEC: vector.ph: |
| ; AUTO_VEC-NEXT: [[N_VEC:%.*]] = and i64 [[SMAX]], 9223372036854775792 |
| ; AUTO_VEC: br label %vector.body |
| ; AUTO_VEC: middle.block: |
| ; AUTO_VEC: [[TMP11:%.*]] = add nsw i64 [[N_VEC]], -1 |
| ; AUTO_VEC-NEXT: [[CAST_CMO:%.*]] = sitofp i64 [[TMP11]] to double |
| ; AUTO_VEC-NEXT: [[TMP12:%.*]] = fmul fast double [[CAST_CMO]], 3.000000e+00 |
| ; AUTO_VEC-NEXT: br i1 {{.*}}, label %for.end, label %for.body |
| ; AUTO_VEC: for.end: |
| ; AUTO_VEC-NEXT: [[J_LCSSA:%.*]] = phi double [ [[TMP12]], %middle.block ], [ %j, %for.body ] |
| ; AUTO_VEC-NEXT: ret double [[J_LCSSA]] |
| ; |
| define double @external_use_with_fast_math(double* %a, i64 %n) { |
| entry: |
| br label %for.body |
| |
| for.body: |
| %i = phi i64 [ 0, %entry ], [%i.next, %for.body] |
| %j = phi double [ 0.0, %entry ], [ %j.next, %for.body ] |
| %tmp0 = getelementptr double, double* %a, i64 %i |
| store double %j, double* %tmp0 |
| %i.next = add i64 %i, 1 |
| %j.next = fadd fast double %j, 3.0 |
| %cond = icmp slt i64 %i.next, %n |
| br i1 %cond, label %for.body, label %for.end |
| |
| for.end: |
| %tmp1 = phi double [ %j, %for.body ] |
| ret double %tmp1 |
| } |
| |
| ; AUTO_VEC-LABEL: @external_use_without_fast_math( |
| ; AUTO_VEC: for.body: |
| ; AUTO_VEC: [[J:%.*]] = phi double [ 0.000000e+00, %entry ], [ [[J_NEXT:%.*]], %for.body ] |
| ; AUTO_VEC: [[J_NEXT]] = fadd double [[J]], 3.000000e+00 |
| ; AUTO_VEC: br i1 {{.*}}, label %for.body, label %for.end |
| ; AUTO_VEC: for.end: |
| ; AUTO_VEC-NEXT: ret double [[J]] |
| ; |
| define double @external_use_without_fast_math(double* %a, i64 %n) { |
| entry: |
| br label %for.body |
| |
| for.body: |
| %i = phi i64 [ 0, %entry ], [%i.next, %for.body] |
| %j = phi double [ 0.0, %entry ], [ %j.next, %for.body ] |
| %tmp0 = getelementptr double, double* %a, i64 %i |
| store double %j, double* %tmp0 |
| %i.next = add i64 %i, 1 |
| %j.next = fadd double %j, 3.0 |
| %cond = icmp slt i64 %i.next, %n |
| br i1 %cond, label %for.body, label %for.end |
| |
| for.end: |
| %tmp1 = phi double [ %j, %for.body ] |
| ret double %tmp1 |
| } |
| |
| attributes #0 = { "no-nans-fp-math"="true" } |
| attributes #1 = { "no-nans-fp-math"="false" } |