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e0d97dea2f
When type shrinking reductions, we should insert the truncations and extends at the end of the loop latch block. Previously, these instructions were inserted at the end of the loop header block. The difference is only a problem for loops with predicated instructions (e.g., conditional stores and instructions that may divide by zero). For these instructions, we create new basic blocks inside the vectorized loop, which cause the loop header and latch to no longer be the same block. This should fix PR34687. Reference: https://bugs.llvm.org/show_bug.cgi?id=34687 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@314542 91177308-0d34-0410-b5e6-96231b3b80d8
41 lines
1.4 KiB
LLVM
41 lines
1.4 KiB
LLVM
; RUN: opt < %s -force-vector-width=4 -force-vector-interleave=1 -loop-vectorize -S | FileCheck %s
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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; CHECK-LABEL: @PR34687(
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; CHECK: vector.body:
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; CHECK-NEXT: [[INDEX:%.*]] = phi i32 [ 0, %vector.ph ], [ [[INDEX_NEXT:%.*]], %[[LATCH:.*]] ]
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; CHECK-NEXT: [[VEC_PHI:%.*]] = phi <4 x i32> [ zeroinitializer, %vector.ph ], [ [[TMP17:%.*]], %[[LATCH]] ]
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; CHECK: [[LATCH]]:
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; CHECK: [[TMP13:%.*]] = and <4 x i32> [[VEC_PHI]], <i32 255, i32 255, i32 255, i32 255>
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; CHECK-NEXT: [[TMP14:%.*]] = add nuw nsw <4 x i32> [[TMP13]], {{.*}}
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; CHECK-NEXT: [[INDEX_NEXT]] = add i32 [[INDEX]], 4
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; CHECK: [[TMP16:%.*]] = trunc <4 x i32> [[TMP14]] to <4 x i8>
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; CHECK-NEXT: [[TMP17]] = zext <4 x i8> [[TMP16]] to <4 x i32>
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; CHECK-NEXT: br i1 {{.*}}, label %middle.block, label %vector.body
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;
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define void @PR34687(i1 %c, i32 %x, i32 %n) {
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entry:
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br label %for.body
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for.body:
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%i = phi i32 [ 0, %entry ], [ %i.next, %if.end ]
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%r = phi i32 [ 0, %entry ], [ %r.next, %if.end ]
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br i1 %c, label %if.then, label %if.end
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if.then:
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%tmp0 = sdiv i32 undef, undef
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br label %if.end
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if.end:
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%tmp1 = and i32 %r, 255
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%i.next = add nsw i32 %i, 1
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%r.next = add nuw nsw i32 %tmp1, %x
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%cond = icmp eq i32 %i.next, %n
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br i1 %cond, label %for.end, label %for.body
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for.end:
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%tmp2 = phi i32 [ %r.next, %if.end ]
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ret void
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}
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