diff options
| -rw-r--r-- | lib/Transforms/Vectorize/LoopVectorize.cpp | 2 | ||||
| -rw-r--r-- | test/Transforms/LoopVectorize/no_idiv_reduction.ll | 24 |
2 files changed, 24 insertions, 2 deletions
diff --git a/lib/Transforms/Vectorize/LoopVectorize.cpp b/lib/Transforms/Vectorize/LoopVectorize.cpp index acf2b81..238fc8b 100644 --- a/lib/Transforms/Vectorize/LoopVectorize.cpp +++ b/lib/Transforms/Vectorize/LoopVectorize.cpp @@ -2833,8 +2833,6 @@ LoopVectorizationLegality::isReductionInstr(Instruction *I, case Instruction::Sub: case Instruction::Add: return Kind == RK_IntegerAdd; - case Instruction::SDiv: - case Instruction::UDiv: case Instruction::Mul: return Kind == RK_IntegerMult; case Instruction::And: diff --git a/test/Transforms/LoopVectorize/no_idiv_reduction.ll b/test/Transforms/LoopVectorize/no_idiv_reduction.ll new file mode 100644 index 0000000..cdfb3fd --- /dev/null +++ b/test/Transforms/LoopVectorize/no_idiv_reduction.ll @@ -0,0 +1,24 @@ +; RUN: opt -loop-vectorize -force-vector-width=2 -force-vector-unroll=1 -S < %s | FileCheck %s +@a = common global [128 x i32] zeroinitializer, align 16 + +;; Must not vectorize division reduction. Division is lossy. +define i32 @g() { +entry: + br label %for.body + +for.body: + ; CHECK: @g + ; CHECK-NOT: sdiv <2 x i32> + %indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ] + %r.05 = phi i32 [ 80, %entry ], [ %div, %for.body ] + %arrayidx = getelementptr inbounds [128 x i32]* @a, i64 0, i64 %indvars.iv + %0 = load i32* %arrayidx, align 4 + %div = sdiv i32 %r.05, %0 + %indvars.iv.next = add i64 %indvars.iv, 1 + %lftr.wideiv = trunc i64 %indvars.iv.next to i32 + %exitcond = icmp eq i32 %lftr.wideiv, 1024 + br i1 %exitcond, label %for.end, label %for.body + +for.end: + ret i32 %div +} |