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
281 lines
16 KiB
LLVM
281 lines
16 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 5
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; RUN: opt < %s -passes=loop-vectorize -force-vector-width=4 -force-vector-interleave=2 -S | FileCheck %s
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define void @test1(ptr noalias nocapture %a, ptr noalias nocapture readonly %b) {
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; CHECK-LABEL: define void @test1(
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; CHECK-SAME: ptr noalias captures(none) [[A:%.*]], ptr noalias readonly captures(none) [[B:%.*]]) {
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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 i64 [ 0, %[[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], %[[VECTOR_BODY]] ]
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; CHECK-NEXT: [[TMP0:%.*]] = getelementptr inbounds float, ptr [[B]], i64 [[INDEX]]
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; CHECK-NEXT: [[TMP1:%.*]] = getelementptr inbounds float, ptr [[TMP0]], i32 4
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; CHECK-NEXT: [[WIDE_LOAD:%.*]] = load <4 x float>, ptr [[TMP0]], align 4
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; CHECK-NEXT: [[WIDE_LOAD1:%.*]] = load <4 x float>, ptr [[TMP1]], align 4
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; CHECK-NEXT: tail call void @llvm.experimental.noalias.scope.decl(metadata [[META0:![0-9]+]])
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; CHECK-NEXT: [[TMP2:%.*]] = fadd <4 x float> [[WIDE_LOAD]], splat (float 1.000000e+00)
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; CHECK-NEXT: [[TMP3:%.*]] = fadd <4 x float> [[WIDE_LOAD1]], splat (float 1.000000e+00)
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; CHECK-NEXT: [[TMP4:%.*]] = getelementptr inbounds float, ptr [[A]], i64 [[INDEX]]
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; CHECK-NEXT: [[TMP5:%.*]] = getelementptr inbounds float, ptr [[TMP4]], i32 4
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; CHECK-NEXT: store <4 x float> [[TMP2]], ptr [[TMP4]], align 4
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; CHECK-NEXT: store <4 x float> [[TMP3]], ptr [[TMP5]], align 4
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; CHECK-NEXT: [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 8
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; CHECK-NEXT: [[TMP6:%.*]] = icmp eq i64 [[INDEX_NEXT]], 1600
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; CHECK-NEXT: br i1 [[TMP6]], label %[[MIDDLE_BLOCK:.*]], label %[[VECTOR_BODY]], !llvm.loop [[LOOP3:![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: [[INDVARS_IV:%.*]] = phi i64 [ 0, %[[SCALAR_PH]] ], [ [[INDVARS_IV_NEXT:%.*]], %[[FOR_BODY]] ]
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; CHECK-NEXT: [[ARRAYIDX:%.*]] = getelementptr inbounds float, ptr [[B]], i64 [[INDVARS_IV]]
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; CHECK-NEXT: [[TMP7:%.*]] = load float, ptr [[ARRAYIDX]], align 4
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; CHECK-NEXT: [[CMP1:%.*]] = fcmp ogt float [[TMP7]], 1.000000e+02
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; CHECK-NEXT: tail call void @llvm.experimental.noalias.scope.decl(metadata [[META0]])
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; CHECK-NEXT: [[ADD:%.*]] = fadd float [[TMP7]], 1.000000e+00
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; CHECK-NEXT: [[ARRAYIDX5:%.*]] = getelementptr inbounds float, ptr [[A]], i64 [[INDVARS_IV]]
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; CHECK-NEXT: store float [[ADD]], ptr [[ARRAYIDX5]], 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:%.*]] = icmp eq i64 [[INDVARS_IV]], 1599
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; CHECK-NEXT: br i1 [[EXITCOND]], label %[[FOR_END]], label %[[FOR_BODY]]
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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: ; preds = %for.body, %entry
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%indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
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%arrayidx = getelementptr inbounds float, ptr %b, i64 %indvars.iv
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%0 = load float, ptr %arrayidx, align 4
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%cmp1 = fcmp ogt float %0, 1.000000e+02
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tail call void @llvm.experimental.noalias.scope.decl(metadata !0)
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%add = fadd float %0, 1.000000e+00
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%arrayidx5 = getelementptr inbounds float, ptr %a, i64 %indvars.iv
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store float %add, ptr %arrayidx5, align 4
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%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
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%exitcond = icmp eq i64 %indvars.iv, 1599
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br i1 %exitcond, label %for.end, label %for.body
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for.end: ; preds = %for.body
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ret void
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}
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declare void @llvm.experimental.noalias.scope.decl(metadata)
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%struct.data = type { ptr, ptr }
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define void @test2(ptr nocapture readonly %d) {
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; CHECK-LABEL: define void @test2(
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; CHECK-SAME: ptr readonly captures(none) [[D:%.*]]) {
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; CHECK-NEXT: [[ENTRY:.*:]]
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; CHECK-NEXT: [[B:%.*]] = getelementptr inbounds [[STRUCT_DATA:%.*]], ptr [[D]], i64 0, i32 1
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; CHECK-NEXT: [[TMP0:%.*]] = load ptr, ptr [[B]], align 8
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; CHECK-NEXT: [[PTRINT:%.*]] = ptrtoint ptr [[TMP0]] to i64
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; CHECK-NEXT: [[MASKEDPTR:%.*]] = and i64 [[PTRINT]], 31
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; CHECK-NEXT: [[MASKCOND:%.*]] = icmp eq i64 [[MASKEDPTR]], 0
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; CHECK-NEXT: [[TMP1:%.*]] = load ptr, ptr [[D]], align 8
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; CHECK-NEXT: [[PTRINT2:%.*]] = ptrtoint ptr [[TMP1]] to i64
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; CHECK-NEXT: [[MASKEDPTR3:%.*]] = and i64 [[PTRINT2]], 31
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; CHECK-NEXT: [[MASKCOND4:%.*]] = icmp eq i64 [[MASKEDPTR3]], 0
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; CHECK-NEXT: br label %[[VECTOR_MEMCHECK:.*]]
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; CHECK: [[VECTOR_MEMCHECK]]:
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; CHECK-NEXT: [[TMP2:%.*]] = sub i64 [[PTRINT2]], [[PTRINT]]
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; CHECK-NEXT: [[DIFF_CHECK:%.*]] = icmp ult i64 [[TMP2]], 32
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; CHECK-NEXT: br i1 [[DIFF_CHECK]], label %[[SCALAR_PH:.*]], 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 i64 [ 0, %[[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], %[[VECTOR_BODY]] ]
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; CHECK-NEXT: tail call void @llvm.experimental.noalias.scope.decl(metadata [[META0]])
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; CHECK-NEXT: [[TMP3:%.*]] = getelementptr inbounds float, ptr [[TMP0]], i64 [[INDEX]]
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; CHECK-NEXT: [[TMP4:%.*]] = getelementptr inbounds float, ptr [[TMP3]], i32 4
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; CHECK-NEXT: [[WIDE_LOAD:%.*]] = load <4 x float>, ptr [[TMP3]], align 4
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; CHECK-NEXT: [[WIDE_LOAD1:%.*]] = load <4 x float>, ptr [[TMP4]], align 4
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; CHECK-NEXT: [[TMP5:%.*]] = fadd <4 x float> [[WIDE_LOAD]], splat (float 1.000000e+00)
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; CHECK-NEXT: [[TMP6:%.*]] = fadd <4 x float> [[WIDE_LOAD1]], splat (float 1.000000e+00)
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; CHECK-NEXT: tail call void @llvm.experimental.noalias.scope.decl(metadata [[META6:![0-9]+]])
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; CHECK-NEXT: [[TMP7:%.*]] = getelementptr inbounds float, ptr [[TMP1]], i64 [[INDEX]]
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; CHECK-NEXT: [[TMP8:%.*]] = getelementptr inbounds float, ptr [[TMP7]], i32 4
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; CHECK-NEXT: store <4 x float> [[TMP5]], ptr [[TMP7]], align 4
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; CHECK-NEXT: store <4 x float> [[TMP6]], ptr [[TMP8]], align 4
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; CHECK-NEXT: [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 8
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; CHECK-NEXT: [[TMP9:%.*]] = icmp eq i64 [[INDEX_NEXT]], 1600
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; CHECK-NEXT: br i1 [[TMP9]], label %[[MIDDLE_BLOCK:.*]], label %[[VECTOR_BODY]], !llvm.loop [[LOOP8:![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: [[INDVARS_IV:%.*]] = phi i64 [ 0, %[[SCALAR_PH]] ], [ [[INDVARS_IV_NEXT:%.*]], %[[FOR_BODY]] ]
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; CHECK-NEXT: tail call void @llvm.experimental.noalias.scope.decl(metadata [[META0]])
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; CHECK-NEXT: [[ARRAYIDX:%.*]] = getelementptr inbounds float, ptr [[TMP0]], i64 [[INDVARS_IV]]
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; CHECK-NEXT: [[TMP10:%.*]] = load float, ptr [[ARRAYIDX]], align 4
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; CHECK-NEXT: [[ADD:%.*]] = fadd float [[TMP10]], 1.000000e+00
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; CHECK-NEXT: tail call void @llvm.experimental.noalias.scope.decl(metadata [[META6]])
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; CHECK-NEXT: [[ARRAYIDX5:%.*]] = getelementptr inbounds float, ptr [[TMP1]], i64 [[INDVARS_IV]]
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; CHECK-NEXT: store float [[ADD]], ptr [[ARRAYIDX5]], 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:%.*]] = icmp eq i64 [[INDVARS_IV]], 1599
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; CHECK-NEXT: br i1 [[EXITCOND]], label %[[FOR_END]], label %[[FOR_BODY]], !llvm.loop [[LOOP9:![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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%b = getelementptr inbounds %struct.data, ptr %d, i64 0, i32 1
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%0 = load ptr, ptr %b, align 8
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%ptrint = ptrtoint ptr %0 to i64
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%maskedptr = and i64 %ptrint, 31
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%maskcond = icmp eq i64 %maskedptr, 0
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%1 = load ptr, ptr %d, align 8
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%ptrint2 = ptrtoint ptr %1 to i64
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%maskedptr3 = and i64 %ptrint2, 31
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%maskcond4 = icmp eq i64 %maskedptr3, 0
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br label %for.body
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for.body: ; preds = %for.body, %entry
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%indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
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tail call void @llvm.experimental.noalias.scope.decl(metadata !0)
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%arrayidx = getelementptr inbounds float, ptr %0, i64 %indvars.iv
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%2 = load float, ptr %arrayidx, align 4
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%add = fadd float %2, 1.000000e+00
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tail call void @llvm.experimental.noalias.scope.decl(metadata !4)
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%arrayidx5 = getelementptr inbounds float, ptr %1, i64 %indvars.iv
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store float %add, ptr %arrayidx5, align 4
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%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
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%exitcond = icmp eq i64 %indvars.iv, 1599
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br i1 %exitcond, label %for.end, label %for.body
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for.end: ; preds = %for.body
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ret void
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}
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define void @predicated_noalias_scope_decl(ptr noalias nocapture readonly %a, ptr noalias nocapture %b, i32 %n) {
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; Check that the vector.body still contains a llvm.experimental.noalias.scope.decl
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; CHECK-LABEL: define void @predicated_noalias_scope_decl(
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; CHECK-SAME: ptr noalias readonly captures(none) [[A:%.*]], ptr noalias captures(none) [[B:%.*]], i32 [[N:%.*]]) {
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; CHECK-NEXT: [[ENTRY:.*:]]
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; CHECK-NEXT: [[CMP15:%.*]] = icmp eq i32 [[N]], 0
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; CHECK-NEXT: br i1 [[CMP15]], label %[[FOR_COND_CLEANUP:.*]], label %[[FOR_BODY_PREHEADER:.*]]
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; CHECK: [[FOR_BODY_PREHEADER]]:
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; CHECK-NEXT: [[TMP0:%.*]] = zext i32 [[N]] to i64
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; CHECK-NEXT: [[MIN_ITERS_CHECK:%.*]] = icmp ult i64 [[TMP0]], 8
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; CHECK-NEXT: br i1 [[MIN_ITERS_CHECK]], label %[[SCALAR_PH:.*]], label %[[VECTOR_PH:.*]]
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; CHECK: [[VECTOR_PH]]:
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; CHECK-NEXT: [[N_MOD_VF:%.*]] = urem i64 [[TMP0]], 8
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; CHECK-NEXT: [[N_VEC:%.*]] = sub i64 [[TMP0]], [[N_MOD_VF]]
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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: [[VEC_IND:%.*]] = phi <4 x i64> [ <i64 0, i64 1, i64 2, i64 3>, %[[VECTOR_PH]] ], [ [[VEC_IND_NEXT:%.*]], %[[VECTOR_BODY]] ]
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; CHECK-NEXT: [[STEP_ADD:%.*]] = add <4 x i64> [[VEC_IND]], splat (i64 4)
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; CHECK-NEXT: [[TMP1:%.*]] = icmp ult <4 x i64> [[VEC_IND]], splat (i64 495616)
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; CHECK-NEXT: [[TMP2:%.*]] = icmp ult <4 x i64> [[STEP_ADD]], splat (i64 495616)
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; CHECK-NEXT: tail call void @llvm.experimental.noalias.scope.decl(metadata [[META0]])
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; CHECK-NEXT: [[PREDPHI:%.*]] = select <4 x i1> [[TMP1]], <4 x float> splat (float 2.300000e+01), <4 x float> splat (float 4.200000e+01)
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; CHECK-NEXT: [[PREDPHI1:%.*]] = select <4 x i1> [[TMP2]], <4 x float> splat (float 2.300000e+01), <4 x float> splat (float 4.200000e+01)
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; CHECK-NEXT: [[TMP3:%.*]] = getelementptr inbounds float, ptr [[A]], i64 [[INDEX]]
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; CHECK-NEXT: [[TMP4:%.*]] = getelementptr inbounds float, ptr [[TMP3]], i32 4
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; CHECK-NEXT: [[WIDE_LOAD:%.*]] = load <4 x float>, ptr [[TMP3]], align 4
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; CHECK-NEXT: [[WIDE_LOAD2:%.*]] = load <4 x float>, ptr [[TMP4]], align 4
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; CHECK-NEXT: [[TMP5:%.*]] = fmul <4 x float> [[PREDPHI]], [[WIDE_LOAD]]
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; CHECK-NEXT: [[TMP6:%.*]] = fmul <4 x float> [[PREDPHI1]], [[WIDE_LOAD2]]
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; CHECK-NEXT: [[TMP7:%.*]] = getelementptr inbounds float, ptr [[B]], i64 [[INDEX]]
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; CHECK-NEXT: [[TMP8:%.*]] = getelementptr inbounds float, ptr [[TMP7]], i32 4
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; CHECK-NEXT: store <4 x float> [[TMP5]], ptr [[TMP7]], align 4
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; CHECK-NEXT: store <4 x float> [[TMP6]], ptr [[TMP8]], align 4
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; CHECK-NEXT: [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 8
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; CHECK-NEXT: [[VEC_IND_NEXT]] = add <4 x i64> [[STEP_ADD]], splat (i64 4)
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; CHECK-NEXT: [[TMP9:%.*]] = icmp eq i64 [[INDEX_NEXT]], [[N_VEC]]
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; CHECK-NEXT: br i1 [[TMP9]], label %[[MIDDLE_BLOCK:.*]], label %[[VECTOR_BODY]], !llvm.loop [[LOOP10:![0-9]+]]
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; CHECK: [[MIDDLE_BLOCK]]:
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; CHECK-NEXT: [[CMP_N:%.*]] = icmp eq i64 [[TMP0]], [[N_VEC]]
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; CHECK-NEXT: br i1 [[CMP_N]], label %[[FOR_COND_CLEANUP_LOOPEXIT:.*]], label %[[SCALAR_PH]]
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; CHECK: [[SCALAR_PH]]:
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; CHECK-NEXT: [[BC_RESUME_VAL:%.*]] = phi i64 [ [[N_VEC]], %[[MIDDLE_BLOCK]] ], [ 0, %[[FOR_BODY_PREHEADER]] ]
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; CHECK-NEXT: br label %[[FOR_BODY:.*]]
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; CHECK: [[FOR_COND_CLEANUP_LOOPEXIT]]:
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; CHECK-NEXT: br label %[[FOR_COND_CLEANUP]]
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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 [ [[BC_RESUME_VAL]], %[[SCALAR_PH]] ], [ [[INDVARS_IV_NEXT:%.*]], %[[IF_END5:.*]] ]
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; CHECK-NEXT: [[CMP1:%.*]] = icmp ult i64 [[INDVARS_IV]], 495616
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; CHECK-NEXT: br i1 [[CMP1]], label %[[IF_END5]], label %[[IF_ELSE:.*]]
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; CHECK: [[IF_ELSE]]:
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; CHECK-NEXT: [[CMP2:%.*]] = icmp ult i64 [[INDVARS_IV]], 991232
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; CHECK-NEXT: tail call void @llvm.experimental.noalias.scope.decl(metadata [[META0]])
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; CHECK-NEXT: br label %[[IF_END5]]
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; CHECK: [[IF_END5]]:
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; CHECK-NEXT: [[X_0:%.*]] = phi float [ 4.200000e+01, %[[IF_ELSE]] ], [ 2.300000e+01, %[[FOR_BODY]] ]
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; CHECK-NEXT: [[ARRAYIDX:%.*]] = getelementptr inbounds float, ptr [[A]], i64 [[INDVARS_IV]]
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; CHECK-NEXT: [[TMP10:%.*]] = load float, ptr [[ARRAYIDX]], align 4
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; CHECK-NEXT: [[MUL:%.*]] = fmul float [[X_0]], [[TMP10]]
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; CHECK-NEXT: [[ARRAYIDX7:%.*]] = getelementptr inbounds float, ptr [[B]], i64 [[INDVARS_IV]]
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; CHECK-NEXT: store float [[MUL]], ptr [[ARRAYIDX7]], align 4
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; CHECK-NEXT: [[INDVARS_IV_NEXT]] = add nuw nsw i64 [[INDVARS_IV]], 1
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; CHECK-NEXT: [[CMP:%.*]] = icmp eq i64 [[INDVARS_IV_NEXT]], [[TMP0]]
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; CHECK-NEXT: br i1 [[CMP]], label %[[FOR_COND_CLEANUP_LOOPEXIT]], label %[[FOR_BODY]], !llvm.loop [[LOOP11:![0-9]+]]
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;
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entry:
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%cmp15 = icmp eq i32 %n, 0
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br i1 %cmp15, label %for.cond.cleanup, label %for.body.preheader
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for.body.preheader: ; preds = %entry
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%0 = zext i32 %n to i64
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br label %for.body
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for.cond.cleanup.loopexit: ; preds = %if.end5
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br label %for.cond.cleanup
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for.cond.cleanup: ; preds = %for.cond.cleanup.loopexit, %entry
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ret void
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for.body: ; preds = %for.body.preheader, %if.end5
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%indvars.iv = phi i64 [ 0, %for.body.preheader ], [ %indvars.iv.next, %if.end5 ]
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%cmp1 = icmp ult i64 %indvars.iv, 495616
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br i1 %cmp1, label %if.end5, label %if.else
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if.else: ; preds = %for.body
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%cmp2 = icmp ult i64 %indvars.iv, 991232
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tail call void @llvm.experimental.noalias.scope.decl(metadata !0)
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br label %if.end5
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if.end5: ; preds = %for.body, %if.else
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%x.0 = phi float [ 4.200000e+01, %if.else ], [ 2.300000e+01, %for.body ]
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%arrayidx = getelementptr inbounds float, ptr %a, i64 %indvars.iv
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%1 = load float, ptr %arrayidx, align 4
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%mul = fmul float %x.0, %1
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%arrayidx7 = getelementptr inbounds float, ptr %b, i64 %indvars.iv
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store float %mul, ptr %arrayidx7, align 4
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%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
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%cmp = icmp eq i64 %indvars.iv.next, %0
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br i1 %cmp, label %for.cond.cleanup.loopexit, label %for.body
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}
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!0 = !{ !1 }
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!1 = distinct !{ !1, !2 }
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!2 = distinct !{ !2 }
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!3 = distinct !{ !3, !2 }
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!4 = !{ !3 }
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;.
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; CHECK: [[META0]] = !{[[META1:![0-9]+]]}
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; CHECK: [[META1]] = distinct !{[[META1]], [[META2:![0-9]+]]}
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; CHECK: [[META2]] = distinct !{[[META2]]}
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; CHECK: [[LOOP3]] = distinct !{[[LOOP3]], [[META4:![0-9]+]], [[META5:![0-9]+]]}
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; CHECK: [[META4]] = !{!"llvm.loop.isvectorized", i32 1}
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; CHECK: [[META5]] = !{!"llvm.loop.unroll.runtime.disable"}
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; CHECK: [[META6]] = !{[[META7:![0-9]+]]}
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; CHECK: [[META7]] = distinct !{[[META7]], [[META2]]}
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; CHECK: [[LOOP8]] = distinct !{[[LOOP8]], [[META4]], [[META5]]}
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; CHECK: [[LOOP9]] = distinct !{[[LOOP9]], [[META4]]}
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; CHECK: [[LOOP10]] = distinct !{[[LOOP10]], [[META4]], [[META5]]}
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; CHECK: [[LOOP11]] = distinct !{[[LOOP11]], [[META5]], [[META4]]}
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;.
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