[OPENMP][LV][D3423] Respect Hints.Force meta-data for loops in LoopVectorizer

llvm-svn: 207512

1 files changed, 93 insertions, 0 deletions

diff --git a/llvm/test/Transforms/LoopVectorize/X86/vect.omp.force.ll b/llvm/test/Transforms/LoopVectorize/X86/vect.omp.force.ll
new file mode 100644
index 00000000000..84ffb2721e3
--- /dev/null
+++ b/llvm/test/Transforms/LoopVectorize/X86/vect.omp.force.ll
@@ -0,0 +1,93 @@
+; RUN: opt < %s  -loop-vectorize -mtriple=x86_64-apple-macosx10.8.0 -mcpu=corei7-avx -debug-only=loop-vectorize -stats -S 2>&1 | FileCheck %s
+; REQUIRES: asserts
+
+; CHECK: LV: Loop hints: force=enabled
+; CHECK: LV: Loop hints: force=?
+; No more loops in the module
+; CHECK-NOT: LV: Loop hints: force=
+; CHECK: 2 loop-vectorize               - Number of loops analyzed for vectorization
+; CHECK: 1 loop-vectorize               - Number of loops vectorized
+
+target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
+target triple = "x86_64-apple-macosx10.8.0"
+
+;
+; The source code for the test:
+;
+; #include <math.h>
+; void foo(float* restrict A, float * restrict B, int size)
+; {
+;   for (int i = 0; i < size; ++i) A[i] = sinf(B[i]);
+; }
+;
+
+;
+; This loop will be vectorized, although the scalar cost is lower than any of vector costs, but vectorization is explicitly forced in metadata.
+;
+
+define void @vectorized(float* noalias nocapture %A, float* noalias nocapture %B, i32 %size) {
+entry:
+  %cmp6 = icmp sgt i32 %size, 0
+  br i1 %cmp6, label %for.body.preheader, label %for.end
+
+for.body.preheader:
+  br label %for.body
+
+for.body:
+  %indvars.iv = phi i64 [ %indvars.iv.next, %for.body ], [ 0, %for.body.preheader ]
+  %arrayidx = getelementptr inbounds float* %B, i64 %indvars.iv
+  %0 = load float* %arrayidx, align 4, !llvm.mem.parallel_loop_access !1
+  %call = tail call float @llvm.sin.f32(float %0)
+  %arrayidx2 = getelementptr inbounds float* %A, i64 %indvars.iv
+  store float %call, float* %arrayidx2, align 4, !llvm.mem.parallel_loop_access !1
+  %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, %size
+  br i1 %exitcond, label %for.end.loopexit, label %for.body, !llvm.loop !1
+
+for.end.loopexit:
+  br label %for.end
+
+for.end:
+  ret void
+}
+
+!1 = metadata !{metadata !1, metadata !2}
+!2 = metadata !{metadata !"llvm.vectorizer.enable", i1 true}
+
+;
+; This method will not be vectorized, as scalar cost is lower than any of vector costs.
+;
+
+define void @not_vectorized(float* noalias nocapture %A, float* noalias nocapture %B, i32 %size) {
+entry:
+  %cmp6 = icmp sgt i32 %size, 0
+  br i1 %cmp6, label %for.body.preheader, label %for.end
+
+for.body.preheader:
+  br label %for.body
+
+for.body:
+  %indvars.iv = phi i64 [ %indvars.iv.next, %for.body ], [ 0, %for.body.preheader ]
+  %arrayidx = getelementptr inbounds float* %B, i64 %indvars.iv
+  %0 = load float* %arrayidx, align 4, !llvm.mem.parallel_loop_access !3
+  %call = tail call float @llvm.sin.f32(float %0)
+  %arrayidx2 = getelementptr inbounds float* %A, i64 %indvars.iv
+  store float %call, float* %arrayidx2, align 4, !llvm.mem.parallel_loop_access !3
+  %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, %size
+  br i1 %exitcond, label %for.end.loopexit, label %for.body, !llvm.loop !3
+
+for.end.loopexit:
+  br label %for.end
+
+for.end:
+  ret void
+}
+
+declare float @llvm.sin.f32(float) nounwind readnone
+
+; Dummy metadata
+!3 = metadata !{metadata !3}
+