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6936839d54
Allowed loop vectorization with secondary FP IVs. Like this:
float *A;
float x = init;
for (int i=0; i < N; ++i) {
A[i] = x;
x -= fp_inc;
}
The auto-vectorization is possible when the induction binary operator is "fast" or the function has "unsafe" attribute.
Differential Revision: https://reviews.llvm.org/D21330
llvm-svn: 276554
87 lines
3.0 KiB
LLVM
87 lines
3.0 KiB
LLVM
; RUN: opt < %s -O3 -mcpu=core-avx2 -mtriple=x86_64-unknown-linux-gnu -S | FileCheck --check-prefix AUTO_VEC %s
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; This test checks auto-vectorization with FP induction variable.
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; The FP operation is not "fast" and requires "fast-math" function attribute.
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;void fp_iv_loop1(float * __restrict__ A, int N) {
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; float x = 1.0;
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; for (int i=0; i < N; ++i) {
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; A[i] = x;
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; x += 0.5;
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; }
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;}
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; AUTO_VEC-LABEL: @fp_iv_loop1(
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; AUTO_VEC: vector.body
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; AUTO_VEC: store <8 x float>
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define void @fp_iv_loop1(float* noalias nocapture %A, i32 %N) #0 {
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entry:
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%cmp4 = icmp sgt i32 %N, 0
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br i1 %cmp4, label %for.body.preheader, label %for.end
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for.body.preheader: ; preds = %entry
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br label %for.body
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for.body: ; preds = %for.body.preheader, %for.body
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%indvars.iv = phi i64 [ %indvars.iv.next, %for.body ], [ 0, %for.body.preheader ]
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%x.06 = phi float [ %conv1, %for.body ], [ 1.000000e+00, %for.body.preheader ]
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%arrayidx = getelementptr inbounds float, float* %A, i64 %indvars.iv
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store float %x.06, float* %arrayidx, align 4
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%conv1 = fadd float %x.06, 5.000000e-01
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%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
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%lftr.wideiv = trunc i64 %indvars.iv.next to i32
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%exitcond = icmp eq i32 %lftr.wideiv, %N
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br i1 %exitcond, label %for.end.loopexit, label %for.body
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for.end.loopexit: ; preds = %for.body
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br label %for.end
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for.end: ; preds = %for.end.loopexit, %entry
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ret void
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}
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; The same as the previous, FP operation is not fast, different function attribute
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; Vectorization should be rejected.
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;void fp_iv_loop2(float * __restrict__ A, int N) {
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; float x = 1.0;
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; for (int i=0; i < N; ++i) {
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; A[i] = x;
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; x += 0.5;
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; }
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;}
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; AUTO_VEC-LABEL: @fp_iv_loop2(
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; AUTO_VEC-NOT: vector.body
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; AUTO_VEC-NOT: store <{{.*}} x float>
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define void @fp_iv_loop2(float* noalias nocapture %A, i32 %N) #1 {
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entry:
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%cmp4 = icmp sgt i32 %N, 0
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br i1 %cmp4, label %for.body.preheader, label %for.end
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for.body.preheader: ; preds = %entry
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br label %for.body
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for.body: ; preds = %for.body.preheader, %for.body
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%indvars.iv = phi i64 [ %indvars.iv.next, %for.body ], [ 0, %for.body.preheader ]
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%x.06 = phi float [ %conv1, %for.body ], [ 1.000000e+00, %for.body.preheader ]
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%arrayidx = getelementptr inbounds float, float* %A, i64 %indvars.iv
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store float %x.06, float* %arrayidx, align 4
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%conv1 = fadd float %x.06, 5.000000e-01
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%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
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%lftr.wideiv = trunc i64 %indvars.iv.next to i32
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%exitcond = icmp eq i32 %lftr.wideiv, %N
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br i1 %exitcond, label %for.end.loopexit, label %for.body
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for.end.loopexit: ; preds = %for.body
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br label %for.end
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for.end: ; preds = %for.end.loopexit, %entry
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ret void
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}
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attributes #0 = { "no-nans-fp-math"="true" }
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attributes #1 = { "no-nans-fp-math"="false" }
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