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
53 lines
2.6 KiB
LLVM
53 lines
2.6 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --check-globals none --filter-out-after "scalar.ph\:" --version 5
|
|
; RUN: opt < %s -passes=loop-vectorize -force-vector-width=4 -S | FileCheck %s
|
|
|
|
; Test case for PR45525. Checks that phi's with a single predecessor and a mask are supported.
|
|
|
|
define void @main(i1 %cond, ptr %arr) {
|
|
; CHECK-LABEL: define void @main(
|
|
; CHECK-SAME: i1 [[COND:%.*]], ptr [[ARR:%.*]]) {
|
|
; CHECK-NEXT: [[BB_0:.*:]]
|
|
; CHECK-NEXT: br label %[[VECTOR_PH:.*]]
|
|
; CHECK: [[VECTOR_PH]]:
|
|
; CHECK-NEXT: [[BROADCAST_SPLATINSERT:%.*]] = insertelement <4 x i1> poison, i1 [[COND]], i64 0
|
|
; CHECK-NEXT: [[BROADCAST_SPLAT:%.*]] = shufflevector <4 x i1> [[BROADCAST_SPLATINSERT]], <4 x i1> poison, <4 x i32> zeroinitializer
|
|
; CHECK-NEXT: br label %[[VECTOR_BODY:.*]]
|
|
; CHECK: [[VECTOR_BODY]]:
|
|
; CHECK-NEXT: [[INDEX:%.*]] = phi i32 [ 0, %[[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], %[[VECTOR_BODY]] ]
|
|
; CHECK-NEXT: [[VEC_IND:%.*]] = phi <4 x i32> [ <i32 0, i32 1, i32 2, i32 3>, %[[VECTOR_PH]] ], [ [[VEC_IND_NEXT:%.*]], %[[VECTOR_BODY]] ]
|
|
; CHECK-NEXT: [[TMP5:%.*]] = mul <4 x i32> [[VEC_IND]], splat (i32 3)
|
|
; CHECK-NEXT: [[PREDPHI:%.*]] = select <4 x i1> [[BROADCAST_SPLAT]], <4 x i32> splat (i32 7), <4 x i32> [[TMP5]]
|
|
; CHECK-NEXT: [[TMP1:%.*]] = getelementptr inbounds i32, ptr [[ARR]], i32 [[INDEX]]
|
|
; CHECK-NEXT: store <4 x i32> [[PREDPHI]], ptr [[TMP1]], align 4
|
|
; CHECK-NEXT: [[INDEX_NEXT]] = add nuw i32 [[INDEX]], 4
|
|
; CHECK-NEXT: [[VEC_IND_NEXT]] = add <4 x i32> [[VEC_IND]], splat (i32 4)
|
|
; CHECK-NEXT: [[TMP2:%.*]] = icmp eq i32 [[INDEX_NEXT]], 32
|
|
; CHECK-NEXT: br i1 [[TMP2]], label %[[MIDDLE_BLOCK:.*]], label %[[VECTOR_BODY]], !llvm.loop [[LOOP0:![0-9]+]]
|
|
; CHECK: [[MIDDLE_BLOCK]]:
|
|
; CHECK-NEXT: br [[BB_4:label %.*]]
|
|
; CHECK: [[SCALAR_PH:.*:]]
|
|
;
|
|
bb.0:
|
|
br label %bb.1
|
|
|
|
bb.1: ; preds = %bb.3, %bb.0
|
|
%iv = phi i32 [ 0, %bb.0 ], [ %iv.next, %bb.3 ]
|
|
br i1 %cond, label %bb.3, label %bb.2
|
|
|
|
bb.2: ; preds = %bb.1
|
|
%single.pred = phi i32 [ %iv, %bb.1 ]
|
|
%mult = mul i32 %single.pred, 3
|
|
br label %bb.3
|
|
|
|
bb.3: ; preds = %bb.2, %bb.1
|
|
%stored.value = phi i32 [ 7, %bb.1 ], [ %mult, %bb.2 ]
|
|
%arrayidx = getelementptr inbounds i32, ptr %arr, i32 %iv
|
|
store i32 %stored.value, ptr %arrayidx
|
|
%iv.next = add i32 %iv, 1
|
|
%continue = icmp ult i32 %iv.next, 32
|
|
br i1 %continue, label %bb.1, label %bb.4
|
|
|
|
bb.4: ; preds = %bb.3
|
|
ret void
|
|
}
|