50b9ca4dda
After https://github.com/llvm/llvm-project/pull/153643, there may be a BranchOnCond with constant condition in the entry block. Simplify those in removeBranchOnConst. This removes a number of redundant conditional branch from entry blocks. In some cases, it may also make the original scalar loop unreachable, because we know it will never execute. In that case, we need to remove the loop from LoopInfo, because all unreachable blocks may dominate each other, making LoopInfo invalid. In those cases, we can also completely remove the loop, for which I'll share a follow-up patch. Depends on https://github.com/llvm/llvm-project/pull/153643. PR: https://github.com/llvm/llvm-project/pull/154510
108 lines
5.1 KiB
LLVM
108 lines
5.1 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt < %s -passes=loop-vectorize -vectorize-num-stores-pred=2 -prefer-predicate-over-epilogue=predicate-dont-vectorize -S | FileCheck %s
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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"
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; Vectorization with dependence checks.
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; Check that a non-power-of-2 MaxVF, calculated based on maximum safe distance,
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; does not lead fold-tail to think that no tail will be generated for any chosen
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; (power of 2) VF.
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; Dependence distance here is 3 iterations.
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; Tiny trip count of 15 divides 3, but any (even) VF will have a tail.
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;unsigned char a [15+3];
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;void maxvf3(){
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; for (int j = 0; j < 15; ++j) {
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; a[j] = 69;
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; a[j+3] = 7;
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; }
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;}
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@a = common local_unnamed_addr global [18 x i8] zeroinitializer, align 16
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define void @maxvf3() {
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; CHECK-LABEL: @maxvf3(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: br label [[VECTOR_PH:%.*]]
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; CHECK: vector.ph:
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; CHECK-NEXT: br label [[VECTOR_BODY:%.*]]
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; CHECK: vector.body:
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; CHECK-NEXT: [[INDEX:%.*]] = phi i32 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], [[PRED_STORE_CONTINUE6:%.*]] ]
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; CHECK-NEXT: [[VEC_IND:%.*]] = phi <2 x i32> [ <i32 0, i32 1>, [[VECTOR_PH]] ], [ [[VEC_IND_NEXT:%.*]], [[PRED_STORE_CONTINUE6]] ]
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; CHECK-NEXT: [[TMP0:%.*]] = icmp ule <2 x i32> [[VEC_IND]], splat (i32 14)
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; CHECK-NEXT: [[TMP1:%.*]] = extractelement <2 x i1> [[TMP0]], i32 0
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; CHECK-NEXT: br i1 [[TMP1]], label [[PRED_STORE_IF:%.*]], label [[PRED_STORE_CONTINUE:%.*]]
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; CHECK: pred.store.if:
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; CHECK-NEXT: [[TMP2:%.*]] = add i32 [[INDEX]], 0
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; CHECK-NEXT: [[TMP3:%.*]] = getelementptr inbounds [18 x i8], ptr @a, i32 0, i32 [[TMP2]]
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; CHECK-NEXT: store i8 69, ptr [[TMP3]], align 8
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; CHECK-NEXT: br label [[PRED_STORE_CONTINUE]]
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; CHECK: pred.store.continue:
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; CHECK-NEXT: [[TMP4:%.*]] = extractelement <2 x i1> [[TMP0]], i32 1
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; CHECK-NEXT: br i1 [[TMP4]], label [[PRED_STORE_IF1:%.*]], label [[PRED_STORE_CONTINUE2:%.*]]
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; CHECK: pred.store.if1:
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; CHECK-NEXT: [[TMP5:%.*]] = add i32 [[INDEX]], 1
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; CHECK-NEXT: [[TMP6:%.*]] = getelementptr inbounds [18 x i8], ptr @a, i32 0, i32 [[TMP5]]
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; CHECK-NEXT: store i8 69, ptr [[TMP6]], align 8
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; CHECK-NEXT: br label [[PRED_STORE_CONTINUE2]]
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; CHECK: pred.store.continue2:
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; CHECK-NEXT: [[TMP7:%.*]] = add nuw nsw <2 x i32> splat (i32 3), [[VEC_IND]]
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; CHECK-NEXT: [[TMP8:%.*]] = extractelement <2 x i1> [[TMP0]], i32 0
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; CHECK-NEXT: br i1 [[TMP8]], label [[PRED_STORE_IF3:%.*]], label [[PRED_STORE_CONTINUE4:%.*]]
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; CHECK: pred.store.if3:
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; CHECK-NEXT: [[TMP9:%.*]] = extractelement <2 x i32> [[TMP7]], i32 0
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; CHECK-NEXT: [[TMP10:%.*]] = getelementptr inbounds [18 x i8], ptr @a, i32 0, i32 [[TMP9]]
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; CHECK-NEXT: store i8 7, ptr [[TMP10]], align 8
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; CHECK-NEXT: br label [[PRED_STORE_CONTINUE4]]
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; CHECK: pred.store.continue4:
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; CHECK-NEXT: [[TMP11:%.*]] = extractelement <2 x i1> [[TMP0]], i32 1
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; CHECK-NEXT: br i1 [[TMP11]], label [[PRED_STORE_IF5:%.*]], label [[PRED_STORE_CONTINUE6]]
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; CHECK: pred.store.if5:
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; CHECK-NEXT: [[TMP12:%.*]] = extractelement <2 x i32> [[TMP7]], i32 1
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; CHECK-NEXT: [[TMP13:%.*]] = getelementptr inbounds [18 x i8], ptr @a, i32 0, i32 [[TMP12]]
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; CHECK-NEXT: store i8 7, ptr [[TMP13]], align 8
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; CHECK-NEXT: br label [[PRED_STORE_CONTINUE6]]
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; CHECK: pred.store.continue6:
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; CHECK-NEXT: [[INDEX_NEXT]] = add nuw i32 [[INDEX]], 2
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; CHECK-NEXT: [[VEC_IND_NEXT]] = add <2 x i32> [[VEC_IND]], splat (i32 2)
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; CHECK-NEXT: [[TMP14:%.*]] = icmp eq i32 [[INDEX_NEXT]], 16
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; CHECK-NEXT: br i1 [[TMP14]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], !llvm.loop [[LOOP0:![0-9]+]]
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; CHECK: middle.block:
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; CHECK-NEXT: br label [[FOR_END:%.*]]
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; CHECK: scalar.ph:
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; CHECK-NEXT: br label [[FOR_BODY:%.*]]
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; CHECK: for.body:
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; CHECK-NEXT: [[J:%.*]] = phi i32 [ 0, [[SCALAR_PH:%.*]] ], [ [[J_NEXT:%.*]], [[FOR_BODY]] ]
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; CHECK-NEXT: [[AJ:%.*]] = getelementptr inbounds [18 x i8], ptr @a, i32 0, i32 [[J]]
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; CHECK-NEXT: store i8 69, ptr [[AJ]], align 8
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; CHECK-NEXT: [[JP3:%.*]] = add nuw nsw i32 3, [[J]]
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; CHECK-NEXT: [[AJP3:%.*]] = getelementptr inbounds [18 x i8], ptr @a, i32 0, i32 [[JP3]]
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; CHECK-NEXT: store i8 7, ptr [[AJP3]], align 8
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; CHECK-NEXT: [[J_NEXT]] = add nuw nsw i32 [[J]], 1
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; CHECK-NEXT: [[EXITCOND:%.*]] = icmp eq i32 [[J_NEXT]], 15
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; CHECK-NEXT: br i1 [[EXITCOND]], label [[FOR_END]], label [[FOR_BODY]], !llvm.loop [[LOOP3:![0-9]+]]
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; CHECK: for.end:
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; CHECK-NEXT: ret void
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;
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entry:
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br label %for.body
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for.body:
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%j = phi i32 [ 0, %entry ], [ %j.next, %for.body ]
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%aj = getelementptr inbounds [18 x i8], ptr @a, i32 0, i32 %j
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store i8 69, ptr %aj, align 8
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%jp3 = add nuw nsw i32 3, %j
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%ajp3 = getelementptr inbounds [18 x i8], ptr @a, i32 0, i32 %jp3
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store i8 7, ptr %ajp3, align 8
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%j.next = add nuw nsw i32 %j, 1
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%exitcond = icmp eq i32 %j.next, 15
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br i1 %exitcond, label %for.end, label %for.body, !llvm.loop !0
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for.end:
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ret void
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}
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!0 = distinct !{!0, !1}
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!1 = !{!"llvm.loop.vectorize.enable", i1 true}
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