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
175 lines
9.6 KiB
LLVM
175 lines
9.6 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -passes=loop-vectorize,instcombine -force-vector-width=4 -S < %s 2>&1 | FileCheck %s
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target datalayout = "e-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128"
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;;;; Derived from the following C code
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;; void forked_ptrs_different_base_same_offset(ptr A, ptr B, ptr C, int *D) {
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;; for (int i=0; i<100; i++) {
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;; if (D[i] != 0) {
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;; C[i] = A[i];
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;; } else {
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;; C[i] = B[i];
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;; }
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;; }
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;; }
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define dso_local void @forked_ptrs_different_base_same_offset(ptr nocapture readonly %Base1, ptr nocapture readonly %Base2, ptr nocapture %Dest, ptr nocapture readonly %Preds) {
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; CHECK-LABEL: @forked_ptrs_different_base_same_offset(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[BASE1:%.*]] = freeze ptr [[BASE3:%.*]]
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; CHECK-NEXT: [[BASE2:%.*]] = freeze ptr [[BASE4:%.*]]
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; CHECK-NEXT: [[DEST:%.*]] = freeze ptr [[DEST2:%.*]]
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; CHECK-NEXT: br label [[VECTOR_MEMCHECK:%.*]]
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; CHECK: vector.memcheck:
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; CHECK-NEXT: [[DEST1:%.*]] = ptrtoint ptr [[DEST]] to i64
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; CHECK-NEXT: [[PREDS2:%.*]] = ptrtoint ptr [[PREDS:%.*]] to i64
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; CHECK-NEXT: [[BASE23:%.*]] = ptrtoint ptr [[BASE2]] to i64
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; CHECK-NEXT: [[BASE15:%.*]] = ptrtoint ptr [[BASE1]] to i64
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; CHECK-NEXT: [[TMP0:%.*]] = sub i64 [[DEST1]], [[PREDS2]]
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; CHECK-NEXT: [[DIFF_CHECK:%.*]] = icmp ult i64 [[TMP0]], 16
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; CHECK-NEXT: [[TMP1:%.*]] = sub i64 [[DEST1]], [[BASE23]]
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; CHECK-NEXT: [[DIFF_CHECK4:%.*]] = icmp ult i64 [[TMP1]], 16
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; CHECK-NEXT: [[CONFLICT_RDX:%.*]] = or i1 [[DIFF_CHECK]], [[DIFF_CHECK4]]
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; CHECK-NEXT: [[TMP2:%.*]] = sub i64 [[DEST1]], [[BASE15]]
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; CHECK-NEXT: [[DIFF_CHECK6:%.*]] = icmp ult i64 [[TMP2]], 16
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; CHECK-NEXT: [[CONFLICT_RDX7:%.*]] = or i1 [[CONFLICT_RDX]], [[DIFF_CHECK6]]
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; CHECK-NEXT: br i1 [[CONFLICT_RDX7]], label [[SCALAR_PH:%.*]], label [[VECTOR_PH:%.*]]
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; CHECK: vector.ph:
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; CHECK-NEXT: [[BROADCAST_SPLATINSERT:%.*]] = insertelement <4 x ptr> poison, ptr [[BASE2]], i64 0
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; CHECK-NEXT: [[BROADCAST_SPLAT:%.*]] = shufflevector <4 x ptr> [[BROADCAST_SPLATINSERT]], <4 x ptr> poison, <4 x i32> zeroinitializer
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; CHECK-NEXT: [[BROADCAST_SPLATINSERT8:%.*]] = insertelement <4 x ptr> poison, ptr [[BASE1]], i64 0
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; CHECK-NEXT: [[BROADCAST_SPLAT9:%.*]] = shufflevector <4 x ptr> [[BROADCAST_SPLATINSERT8]], <4 x ptr> poison, <4 x i32> zeroinitializer
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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 i64 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], [[VECTOR_BODY]] ]
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; CHECK-NEXT: [[TMP6:%.*]] = getelementptr inbounds i32, ptr [[PREDS]], i64 [[INDEX]]
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; CHECK-NEXT: [[WIDE_LOAD:%.*]] = load <4 x i32>, ptr [[TMP6]], align 4
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; CHECK-NEXT: [[TMP7:%.*]] = icmp eq <4 x i32> [[WIDE_LOAD]], zeroinitializer
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; CHECK-NEXT: [[TMP8:%.*]] = select <4 x i1> [[TMP7]], <4 x ptr> [[BROADCAST_SPLAT]], <4 x ptr> [[BROADCAST_SPLAT9]]
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; CHECK-NEXT: [[TMP9:%.*]] = extractelement <4 x ptr> [[TMP8]], i64 0
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; CHECK-NEXT: [[TMP10:%.*]] = getelementptr inbounds float, ptr [[TMP9]], i64 [[INDEX]]
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; CHECK-NEXT: [[TMP11:%.*]] = extractelement <4 x ptr> [[TMP8]], i64 1
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; CHECK-NEXT: [[TMP29:%.*]] = getelementptr float, ptr [[TMP11]], i64 [[INDEX]]
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; CHECK-NEXT: [[TMP12:%.*]] = getelementptr i8, ptr [[TMP29]], i64 4
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; CHECK-NEXT: [[TMP13:%.*]] = extractelement <4 x ptr> [[TMP8]], i64 2
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; CHECK-NEXT: [[TMP30:%.*]] = getelementptr float, ptr [[TMP13]], i64 [[INDEX]]
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; CHECK-NEXT: [[TMP14:%.*]] = getelementptr i8, ptr [[TMP30]], i64 8
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; CHECK-NEXT: [[TMP15:%.*]] = extractelement <4 x ptr> [[TMP8]], i64 3
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; CHECK-NEXT: [[TMP31:%.*]] = getelementptr float, ptr [[TMP15]], i64 [[INDEX]]
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; CHECK-NEXT: [[TMP16:%.*]] = getelementptr i8, ptr [[TMP31]], i64 12
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; CHECK-NEXT: [[TMP17:%.*]] = load float, ptr [[TMP10]], align 4
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; CHECK-NEXT: [[TMP18:%.*]] = load float, ptr [[TMP12]], align 4
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; CHECK-NEXT: [[TMP19:%.*]] = load float, ptr [[TMP14]], align 4
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; CHECK-NEXT: [[TMP20:%.*]] = load float, ptr [[TMP16]], align 4
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; CHECK-NEXT: [[TMP21:%.*]] = insertelement <4 x float> poison, float [[TMP17]], i64 0
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; CHECK-NEXT: [[TMP22:%.*]] = insertelement <4 x float> [[TMP21]], float [[TMP18]], i64 1
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; CHECK-NEXT: [[TMP23:%.*]] = insertelement <4 x float> [[TMP22]], float [[TMP19]], i64 2
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; CHECK-NEXT: [[TMP24:%.*]] = insertelement <4 x float> [[TMP23]], float [[TMP20]], i64 3
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; CHECK-NEXT: [[TMP25:%.*]] = getelementptr inbounds float, ptr [[DEST]], i64 [[INDEX]]
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; CHECK-NEXT: store <4 x float> [[TMP24]], ptr [[TMP25]], align 4
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; CHECK-NEXT: [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 4
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; CHECK-NEXT: [[TMP26:%.*]] = icmp eq i64 [[INDEX_NEXT]], 100
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; CHECK-NEXT: br i1 [[TMP26]], 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_COND_CLEANUP:%.*]]
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; CHECK: scalar.ph:
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; CHECK-NEXT: br label [[FOR_BODY:%.*]]
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; CHECK: for.cond.cleanup:
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; CHECK-NEXT: ret void
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; CHECK: for.body:
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; CHECK-NEXT: [[INDVARS_IV:%.*]] = phi i64 [ 0, [[SCALAR_PH]] ], [ [[INDVARS_IV_NEXT:%.*]], [[FOR_BODY]] ]
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; CHECK-NEXT: [[ARRAYIDX:%.*]] = getelementptr inbounds nuw i32, ptr [[PREDS]], i64 [[INDVARS_IV]]
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; CHECK-NEXT: [[TMP27:%.*]] = load i32, ptr [[ARRAYIDX]], align 4
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; CHECK-NEXT: [[CMP1_NOT:%.*]] = icmp eq i32 [[TMP27]], 0
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; CHECK-NEXT: [[SPEC_SELECT:%.*]] = select i1 [[CMP1_NOT]], ptr [[BASE2]], ptr [[BASE1]]
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; CHECK-NEXT: [[DOTSINK_IN:%.*]] = getelementptr inbounds nuw float, ptr [[SPEC_SELECT]], i64 [[INDVARS_IV]]
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; CHECK-NEXT: [[DOTSINK:%.*]] = load float, ptr [[DOTSINK_IN]], align 4
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; CHECK-NEXT: [[TMP28:%.*]] = getelementptr inbounds nuw float, ptr [[DEST]], i64 [[INDVARS_IV]]
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; CHECK-NEXT: store float [[DOTSINK]], ptr [[TMP28]], align 4
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; CHECK-NEXT: [[INDVARS_IV_NEXT]] = add nuw nsw i64 [[INDVARS_IV]], 1
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; CHECK-NEXT: [[EXITCOND_NOT:%.*]] = icmp eq i64 [[INDVARS_IV_NEXT]], 100
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; CHECK-NEXT: br i1 [[EXITCOND_NOT]], label [[FOR_COND_CLEANUP]], label [[FOR_BODY]], !llvm.loop [[LOOP3:![0-9]+]]
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;
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entry:
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br label %for.body
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for.cond.cleanup:
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ret void
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for.body:
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%indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
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%arrayidx = getelementptr inbounds i32, ptr %Preds, i64 %indvars.iv
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%0 = load i32, ptr %arrayidx, align 4
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%cmp1.not = icmp eq i32 %0, 0
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%spec.select = select i1 %cmp1.not, ptr %Base2, ptr %Base1
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%.sink.in = getelementptr inbounds float, ptr %spec.select, i64 %indvars.iv
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%.sink = load float, ptr %.sink.in, align 4
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%1 = getelementptr inbounds float, ptr %Dest, i64 %indvars.iv
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store float %.sink, ptr %1, align 4
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%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
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%exitcond.not = icmp eq i64 %indvars.iv.next, 100
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br i1 %exitcond.not, label %for.cond.cleanup, label %for.body
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}
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;;;; Derived from the following C code
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;; void forked_ptrs_same_base_different_offset(ptr A, ptr B, int *C) {
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;; int offset;
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;; for (int i = 0; i < 100; i++) {
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;; if (C[i] != 0)
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;; offset = i;
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;; else
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;; offset = i+1;
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;; B[i] = A[offset];
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;; }
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;; }
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define dso_local void @forked_ptrs_same_base_different_offset(ptr nocapture readonly %Base, ptr nocapture %Dest, ptr nocapture readonly %Preds) {
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; CHECK-LABEL: @forked_ptrs_same_base_different_offset(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: br label [[FOR_BODY:%.*]]
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; CHECK: for.cond.cleanup:
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; CHECK-NEXT: ret void
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; CHECK: for.body:
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; CHECK-NEXT: [[INDVARS_IV:%.*]] = phi i64 [ 0, [[ENTRY:%.*]] ], [ [[INDVARS_IV_NEXT:%.*]], [[FOR_BODY]] ]
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; CHECK-NEXT: [[I_014:%.*]] = phi i32 [ 0, [[ENTRY]] ], [ [[ADD:%.*]], [[FOR_BODY]] ]
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; CHECK-NEXT: [[ARRAYIDX:%.*]] = getelementptr inbounds nuw i32, ptr [[PREDS:%.*]], i64 [[INDVARS_IV]]
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; CHECK-NEXT: [[TMP0:%.*]] = load i32, ptr [[ARRAYIDX]], align 4
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; CHECK-NEXT: [[CMP1_NOT:%.*]] = icmp eq i32 [[TMP0]], 0
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; CHECK-NEXT: [[INDVARS_IV_NEXT]] = add nuw nsw i64 [[INDVARS_IV]], 1
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; CHECK-NEXT: [[ADD]] = add nuw nsw i32 [[I_014]], 1
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; CHECK-NEXT: [[TMP1:%.*]] = trunc i64 [[INDVARS_IV]] to i32
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; CHECK-NEXT: [[OFFSET_0:%.*]] = select i1 [[CMP1_NOT]], i32 [[ADD]], i32 [[TMP1]]
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; CHECK-NEXT: [[IDXPROM213:%.*]] = zext i32 [[OFFSET_0]] to i64
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; CHECK-NEXT: [[ARRAYIDX3:%.*]] = getelementptr inbounds nuw float, ptr [[BASE:%.*]], i64 [[IDXPROM213]]
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; CHECK-NEXT: [[TMP2:%.*]] = load float, ptr [[ARRAYIDX3]], align 4
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; CHECK-NEXT: [[ARRAYIDX5:%.*]] = getelementptr inbounds nuw float, ptr [[DEST:%.*]], i64 [[INDVARS_IV]]
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; CHECK-NEXT: store float [[TMP2]], ptr [[ARRAYIDX5]], align 4
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; CHECK-NEXT: [[EXITCOND_NOT:%.*]] = icmp eq i64 [[INDVARS_IV_NEXT]], 100
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; CHECK-NEXT: br i1 [[EXITCOND_NOT]], label [[FOR_COND_CLEANUP:%.*]], label [[FOR_BODY]]
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;
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entry:
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br label %for.body
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for.cond.cleanup: ; preds = %for.body
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ret void
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for.body: ; preds = %entry, %for.body
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%indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
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%i.014 = phi i32 [ 0, %entry ], [ %add, %for.body ]
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%arrayidx = getelementptr inbounds i32, ptr %Preds, i64 %indvars.iv
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%0 = load i32, ptr %arrayidx, align 4
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%cmp1.not = icmp eq i32 %0, 0
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%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
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%add = add nuw nsw i32 %i.014, 1
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%1 = trunc i64 %indvars.iv to i32
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%offset.0 = select i1 %cmp1.not, i32 %add, i32 %1
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%idxprom213 = zext i32 %offset.0 to i64
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%arrayidx3 = getelementptr inbounds float, ptr %Base, i64 %idxprom213
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%2 = load float, ptr %arrayidx3, align 4
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%arrayidx5 = getelementptr inbounds float, ptr %Dest, i64 %indvars.iv
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store float %2, ptr %arrayidx5, align 4
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%exitcond.not = icmp eq i64 %indvars.iv.next, 100
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br i1 %exitcond.not, label %for.cond.cleanup, label %for.body
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}
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