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
98 lines
5.8 KiB
LLVM
98 lines
5.8 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --check-globals none --version 5
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; RUN: opt < %s -passes=loop-vectorize -mtriple riscv64 -mattr=+v -S | FileCheck %s -check-prefix=NO-ZVFHMIN
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; RUN: opt < %s -passes=loop-vectorize -mtriple riscv64 -mattr=+v -S -prefer-predicate-over-epilogue=scalar-epilogue | FileCheck %s -check-prefix=NO-ZVFHMIN
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; RUN: opt < %s -passes=loop-vectorize -mtriple riscv64 -mattr=+v -S -prefer-predicate-over-epilogue=predicate-else-scalar-epilogue | FileCheck %s -check-prefix=NO-ZVFHMIN
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; RUN: opt < %s -passes=loop-vectorize -mtriple riscv64 -mattr=+v,+zvfhmin -S | FileCheck %s -check-prefix=ZVFHMIN
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define void @fadd(ptr noalias %a, ptr noalias %b, i64 %n) {
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; NO-ZVFHMIN-LABEL: define void @fadd(
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; NO-ZVFHMIN-SAME: ptr noalias [[A:%.*]], ptr noalias [[B:%.*]], i64 [[N:%.*]]) #[[ATTR0:[0-9]+]] {
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; NO-ZVFHMIN-NEXT: [[ENTRY:.*]]:
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; NO-ZVFHMIN-NEXT: br label %[[LOOP:.*]]
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; NO-ZVFHMIN: [[LOOP]]:
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; NO-ZVFHMIN-NEXT: [[I:%.*]] = phi i64 [ 0, %[[ENTRY]] ], [ [[I_NEXT:%.*]], %[[LOOP]] ]
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; NO-ZVFHMIN-NEXT: [[A_GEP:%.*]] = getelementptr half, ptr [[A]], i64 [[I]]
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; NO-ZVFHMIN-NEXT: [[B_GEP:%.*]] = getelementptr half, ptr [[B]], i64 [[I]]
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; NO-ZVFHMIN-NEXT: [[X:%.*]] = load half, ptr [[A_GEP]], align 2
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; NO-ZVFHMIN-NEXT: [[Y:%.*]] = load half, ptr [[B_GEP]], align 2
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; NO-ZVFHMIN-NEXT: [[Z:%.*]] = fadd half [[X]], [[Y]]
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; NO-ZVFHMIN-NEXT: store half [[Z]], ptr [[A_GEP]], align 2
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; NO-ZVFHMIN-NEXT: [[I_NEXT]] = add i64 [[I]], 1
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; NO-ZVFHMIN-NEXT: [[DONE:%.*]] = icmp eq i64 [[I_NEXT]], [[N]]
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; NO-ZVFHMIN-NEXT: br i1 [[DONE]], label %[[EXIT:.*]], label %[[LOOP]]
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; NO-ZVFHMIN: [[EXIT]]:
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; NO-ZVFHMIN-NEXT: ret void
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;
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; ZVFHMIN-LABEL: define void @fadd(
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; ZVFHMIN-SAME: ptr noalias [[A:%.*]], ptr noalias [[B:%.*]], i64 [[N:%.*]]) #[[ATTR0:[0-9]+]] {
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; ZVFHMIN-NEXT: [[ENTRY:.*:]]
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; ZVFHMIN-NEXT: br label %[[VECTOR_PH:.*]]
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; ZVFHMIN: [[VECTOR_PH]]:
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; ZVFHMIN-NEXT: br label %[[VECTOR_BODY:.*]]
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; ZVFHMIN: [[VECTOR_BODY]]:
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; ZVFHMIN-NEXT: [[INDEX:%.*]] = phi i64 [ 0, %[[VECTOR_PH]] ], [ [[INDEX_EVL_NEXT:%.*]], %[[VECTOR_BODY]] ]
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; ZVFHMIN-NEXT: [[AVL:%.*]] = phi i64 [ [[N]], %[[VECTOR_PH]] ], [ [[AVL_NEXT:%.*]], %[[VECTOR_BODY]] ]
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; ZVFHMIN-NEXT: [[TMP6:%.*]] = call i32 @llvm.experimental.get.vector.length.i64(i64 [[AVL]], i32 8, i1 true)
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; ZVFHMIN-NEXT: [[TMP1:%.*]] = getelementptr half, ptr [[A]], i64 [[INDEX]]
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; ZVFHMIN-NEXT: [[TMP2:%.*]] = getelementptr half, ptr [[B]], i64 [[INDEX]]
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; ZVFHMIN-NEXT: [[WIDE_LOAD:%.*]] = call <vscale x 8 x half> @llvm.vp.load.nxv8f16.p0(ptr align 2 [[TMP1]], <vscale x 8 x i1> splat (i1 true), i32 [[TMP6]])
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; ZVFHMIN-NEXT: [[WIDE_LOAD1:%.*]] = call <vscale x 8 x half> @llvm.vp.load.nxv8f16.p0(ptr align 2 [[TMP2]], <vscale x 8 x i1> splat (i1 true), i32 [[TMP6]])
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; ZVFHMIN-NEXT: [[TMP11:%.*]] = fadd <vscale x 8 x half> [[WIDE_LOAD]], [[WIDE_LOAD1]]
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; ZVFHMIN-NEXT: call void @llvm.vp.store.nxv8f16.p0(<vscale x 8 x half> [[TMP11]], ptr align 2 [[TMP1]], <vscale x 8 x i1> splat (i1 true), i32 [[TMP6]])
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; ZVFHMIN-NEXT: [[TMP13:%.*]] = zext i32 [[TMP6]] to i64
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; ZVFHMIN-NEXT: [[INDEX_EVL_NEXT]] = add i64 [[TMP13]], [[INDEX]]
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; ZVFHMIN-NEXT: [[AVL_NEXT]] = sub nuw i64 [[AVL]], [[TMP13]]
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; ZVFHMIN-NEXT: [[TMP7:%.*]] = icmp eq i64 [[AVL_NEXT]], 0
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; ZVFHMIN-NEXT: br i1 [[TMP7]], label %[[MIDDLE_BLOCK:.*]], label %[[VECTOR_BODY]], !llvm.loop [[LOOP0:![0-9]+]]
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; ZVFHMIN: [[MIDDLE_BLOCK]]:
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; ZVFHMIN-NEXT: br label %[[EXIT:.*]]
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; ZVFHMIN: [[SCALAR_PH:.*]]:
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; ZVFHMIN-NEXT: br label %[[LOOP:.*]]
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; ZVFHMIN: [[LOOP]]:
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; ZVFHMIN-NEXT: [[I:%.*]] = phi i64 [ 0, %[[SCALAR_PH]] ], [ [[I_NEXT:%.*]], %[[LOOP]] ]
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; ZVFHMIN-NEXT: [[A_GEP:%.*]] = getelementptr half, ptr [[A]], i64 [[I]]
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; ZVFHMIN-NEXT: [[B_GEP:%.*]] = getelementptr half, ptr [[B]], i64 [[I]]
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; ZVFHMIN-NEXT: [[X:%.*]] = load half, ptr [[A_GEP]], align 2
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; ZVFHMIN-NEXT: [[Y:%.*]] = load half, ptr [[B_GEP]], align 2
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; ZVFHMIN-NEXT: [[Z:%.*]] = fadd half [[X]], [[Y]]
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; ZVFHMIN-NEXT: store half [[Z]], ptr [[A_GEP]], align 2
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; ZVFHMIN-NEXT: [[I_NEXT]] = add i64 [[I]], 1
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; ZVFHMIN-NEXT: [[DONE:%.*]] = icmp eq i64 [[I_NEXT]], [[N]]
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; ZVFHMIN-NEXT: br i1 [[DONE]], label %[[EXIT]], label %[[LOOP]]
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; ZVFHMIN: [[EXIT]]:
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; ZVFHMIN-NEXT: ret void
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;
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; NO-ZVFHMIN-PREDICATED-LABEL: define void @fadd(
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; NO-ZVFHMIN-PREDICATED-SAME: ptr noalias [[A:%.*]], ptr noalias [[B:%.*]], i64 [[N:%.*]]) #[[ATTR0:[0-9]+]] {
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; NO-ZVFHMIN-PREDICATED-NEXT: [[ENTRY:.*]]:
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; NO-ZVFHMIN-PREDICATED-NEXT: br label %[[LOOP:.*]]
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; NO-ZVFHMIN-PREDICATED: [[LOOP]]:
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; NO-ZVFHMIN-PREDICATED-NEXT: [[I:%.*]] = phi i64 [ 0, %[[ENTRY]] ], [ [[I_NEXT:%.*]], %[[LOOP]] ]
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; NO-ZVFHMIN-PREDICATED-NEXT: [[A_GEP:%.*]] = getelementptr half, ptr [[A]], i64 [[I]]
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; NO-ZVFHMIN-PREDICATED-NEXT: [[B_GEP:%.*]] = getelementptr half, ptr [[B]], i64 [[I]]
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; NO-ZVFHMIN-PREDICATED-NEXT: [[X:%.*]] = load half, ptr [[A_GEP]], align 2
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; NO-ZVFHMIN-PREDICATED-NEXT: [[Y:%.*]] = load half, ptr [[B_GEP]], align 2
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; NO-ZVFHMIN-PREDICATED-NEXT: [[Z:%.*]] = fadd half [[X]], [[Y]]
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; NO-ZVFHMIN-PREDICATED-NEXT: store half [[Z]], ptr [[A_GEP]], align 2
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; NO-ZVFHMIN-PREDICATED-NEXT: [[I_NEXT]] = add i64 [[I]], 1
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; NO-ZVFHMIN-PREDICATED-NEXT: [[DONE:%.*]] = icmp eq i64 [[I_NEXT]], [[N]]
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; NO-ZVFHMIN-PREDICATED-NEXT: br i1 [[DONE]], label %[[EXIT:.*]], label %[[LOOP]]
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; NO-ZVFHMIN-PREDICATED: [[EXIT]]:
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; NO-ZVFHMIN-PREDICATED-NEXT: ret void
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entry:
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br label %loop
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loop:
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%i = phi i64 [0, %entry], [%i.next, %loop]
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%a.gep = getelementptr half, ptr %a, i64 %i
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%b.gep = getelementptr half, ptr %b, i64 %i
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%x = load half, ptr %a.gep
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%y = load half, ptr %b.gep
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%z = fadd half %x, %y
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store half %z, ptr %a.gep
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%i.next = add i64 %i, 1
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%done = icmp eq i64 %i.next, %n
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br i1 %done, label %exit, label %loop
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exit:
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ret void
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}
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