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
81 lines
4.9 KiB
LLVM
81 lines
4.9 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
|
|
; RUN: opt -passes=loop-vectorize -force-vector-width=4 -force-vector-interleave=1 -S < %s | FileCheck %s
|
|
|
|
define void @m(ptr nocapture %p, ptr nocapture %p2, i32 %q) {
|
|
; CHECK-LABEL: @m(
|
|
; CHECK-NEXT: entry:
|
|
; CHECK-NEXT: [[ARRAYIDX9_1:%.*]] = getelementptr inbounds i32, ptr [[P2:%.*]], i64 1
|
|
; CHECK-NEXT: [[ARRAYIDX9_2:%.*]] = getelementptr inbounds i32, ptr [[P2]], i64 2
|
|
; CHECK-NEXT: br label [[VECTOR_MEMCHECK:%.*]]
|
|
; CHECK: vector.memcheck:
|
|
; CHECK-NEXT: [[UGLYGEP:%.*]] = getelementptr i8, ptr [[P:%.*]], i64 252
|
|
; CHECK-NEXT: [[UGLYGEP1:%.*]] = getelementptr i8, ptr [[P2]], i64 12
|
|
; CHECK-NEXT: [[BOUND0:%.*]] = icmp ult ptr [[P]], [[UGLYGEP1]]
|
|
; CHECK-NEXT: [[BOUND1:%.*]] = icmp ult ptr [[P2]], [[UGLYGEP]]
|
|
; CHECK-NEXT: [[FOUND_CONFLICT:%.*]] = and i1 [[BOUND0]], [[BOUND1]]
|
|
; CHECK-NEXT: br i1 [[FOUND_CONFLICT]], label [[SCALAR_PH:%.*]], label [[VECTOR_PH:%.*]]
|
|
; CHECK: vector.ph:
|
|
; CHECK-NEXT: br label [[VECTOR_BODY:%.*]]
|
|
; CHECK: vector.body:
|
|
; CHECK-NEXT: [[INDEX:%.*]] = phi i64 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], [[VECTOR_BODY]] ]
|
|
; CHECK-NEXT: [[TMP1:%.*]] = load i32, ptr [[P2]], align 4, !alias.scope [[META0:![0-9]+]]
|
|
; CHECK-NEXT: [[BROADCAST_SPLATINSERT:%.*]] = insertelement <4 x i32> poison, i32 [[TMP1]], i64 0
|
|
; CHECK-NEXT: [[BROADCAST_SPLAT:%.*]] = shufflevector <4 x i32> [[BROADCAST_SPLATINSERT]], <4 x i32> poison, <4 x i32> zeroinitializer
|
|
; CHECK-NEXT: [[TMP2:%.*]] = sub nsw <4 x i32> zeroinitializer, [[BROADCAST_SPLAT]]
|
|
; CHECK-NEXT: [[TMP3:%.*]] = load i32, ptr [[ARRAYIDX9_1]], align 4, !alias.scope [[META0]]
|
|
; CHECK-NEXT: [[BROADCAST_SPLATINSERT2:%.*]] = insertelement <4 x i32> poison, i32 [[TMP3]], i64 0
|
|
; CHECK-NEXT: [[BROADCAST_SPLAT3:%.*]] = shufflevector <4 x i32> [[BROADCAST_SPLATINSERT2]], <4 x i32> poison, <4 x i32> zeroinitializer
|
|
; CHECK-NEXT: [[TMP4:%.*]] = sub nsw <4 x i32> [[TMP2]], [[BROADCAST_SPLAT3]]
|
|
; CHECK-NEXT: [[TMP5:%.*]] = load i32, ptr [[ARRAYIDX9_2]], align 4, !alias.scope [[META0]]
|
|
; CHECK-NEXT: [[BROADCAST_SPLATINSERT4:%.*]] = insertelement <4 x i32> poison, i32 [[TMP5]], i64 0
|
|
; CHECK-NEXT: [[BROADCAST_SPLAT5:%.*]] = shufflevector <4 x i32> [[BROADCAST_SPLATINSERT4]], <4 x i32> poison, <4 x i32> zeroinitializer
|
|
; CHECK-NEXT: [[TMP6:%.*]] = sub nsw <4 x i32> [[TMP4]], [[BROADCAST_SPLAT5]]
|
|
; CHECK-NEXT: [[TMP7:%.*]] = getelementptr inbounds i32, ptr [[P]], i64 [[INDEX]]
|
|
; CHECK-NEXT: store <4 x i32> [[TMP6]], ptr [[TMP7]], align 4, !alias.scope [[META3:![0-9]+]], !noalias [[META0]]
|
|
; CHECK-NEXT: [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 4
|
|
; CHECK-NEXT: [[TMP8:%.*]] = icmp eq i64 [[INDEX_NEXT]], 60
|
|
; CHECK-NEXT: br i1 [[TMP8]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], !llvm.loop [[LOOP5:![0-9]+]]
|
|
; CHECK: middle.block:
|
|
; CHECK-NEXT: br label [[SCALAR_PH]]
|
|
; CHECK: scalar.ph:
|
|
; CHECK-NEXT: [[BC_RESUME_VAL:%.*]] = phi i64 [ 60, [[MIDDLE_BLOCK]] ], [ 0, [[VECTOR_MEMCHECK]] ]
|
|
; CHECK-NEXT: br label [[FOR_COND5:%.*]]
|
|
; CHECK: for.cond5:
|
|
; CHECK-NEXT: [[INDVARS_IV:%.*]] = phi i64 [ [[BC_RESUME_VAL]], [[SCALAR_PH]] ], [ [[INDVARS_IV_NEXT:%.*]], [[FOR_COND5]] ]
|
|
; CHECK-NEXT: [[I3:%.*]] = load i32, ptr [[P2]], align 4
|
|
; CHECK-NEXT: [[SUB:%.*]] = sub nsw i32 0, [[I3]]
|
|
; CHECK-NEXT: [[I4:%.*]] = load i32, ptr [[ARRAYIDX9_1]], align 4
|
|
; CHECK-NEXT: [[SUB_1:%.*]] = sub nsw i32 [[SUB]], [[I4]]
|
|
; CHECK-NEXT: [[I5:%.*]] = load i32, ptr [[ARRAYIDX9_2]], align 4
|
|
; CHECK-NEXT: [[SUB_2:%.*]] = sub nsw i32 [[SUB_1]], [[I5]]
|
|
; CHECK-NEXT: [[ARRAYIDX14:%.*]] = getelementptr inbounds i32, ptr [[P]], i64 [[INDVARS_IV]]
|
|
; CHECK-NEXT: store i32 [[SUB_2]], ptr [[ARRAYIDX14]], align 4
|
|
; CHECK-NEXT: [[INDVARS_IV_NEXT]] = add nuw nsw i64 [[INDVARS_IV]], 1
|
|
; CHECK-NEXT: [[EXITCOND:%.*]] = icmp eq i64 [[INDVARS_IV_NEXT]], 63
|
|
; CHECK-NEXT: br i1 [[EXITCOND]], label [[FOR_END17:%.*]], label [[FOR_COND5]], !llvm.loop [[LOOP8:![0-9]+]]
|
|
; CHECK: for.end17:
|
|
; CHECK-NEXT: ret void
|
|
;
|
|
entry:
|
|
%arrayidx9.1 = getelementptr inbounds i32, ptr %p2, i64 1
|
|
%arrayidx9.2 = getelementptr inbounds i32, ptr %p2, i64 2
|
|
br label %for.cond5
|
|
|
|
for.cond5: ; preds = %entry, %for.cond5
|
|
%indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.cond5 ]
|
|
%i3 = load i32, ptr %p2, align 4
|
|
%sub = sub nsw i32 0, %i3
|
|
%i4 = load i32, ptr %arrayidx9.1, align 4
|
|
%sub.1 = sub nsw i32 %sub, %i4
|
|
%i5 = load i32, ptr %arrayidx9.2, align 4
|
|
%sub.2 = sub nsw i32 %sub.1, %i5
|
|
%arrayidx14 = getelementptr inbounds i32, ptr %p, i64 %indvars.iv
|
|
store i32 %sub.2, ptr %arrayidx14, align 4
|
|
%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
|
|
%exitcond = icmp eq i64 %indvars.iv.next, 63
|
|
br i1 %exitcond, label %for.end17, label %for.cond5
|
|
|
|
for.end17: ; preds = %for.cond5
|
|
ret void
|
|
}
|