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
155 lines
7.8 KiB
LLVM
155 lines
7.8 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 5
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; RUN: opt -passes=loop-vectorize -force-vector-width=4 -S %s | FileCheck %s
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define void @test(ptr %A, i32 %x) {
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; CHECK-LABEL: define void @test(
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; CHECK-SAME: ptr [[A:%.*]], i32 [[X:%.*]]) {
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; CHECK-NEXT: [[ENTRY:.*:]]
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; CHECK-NEXT: br label %[[VECTOR_SCEVCHECK:.*]]
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; CHECK: [[VECTOR_SCEVCHECK]]:
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; CHECK-NEXT: [[IDENT_CHECK:%.*]] = icmp ne i32 [[X]], 1
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; CHECK-NEXT: br i1 [[IDENT_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: [[OFFSET_IDX:%.*]] = phi i64 [ 0, %[[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], %[[VECTOR_BODY]] ]
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; CHECK-NEXT: [[TMP0:%.*]] = trunc i64 [[OFFSET_IDX]] to i32
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; CHECK-NEXT: [[TMP3:%.*]] = add nuw nsw i64 [[OFFSET_IDX]], 1
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; CHECK-NEXT: [[TMP4:%.*]] = trunc i64 [[TMP3]] to i32
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; CHECK-NEXT: [[TMP5:%.*]] = zext i32 [[TMP4]] to i64
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; CHECK-NEXT: [[TMP6:%.*]] = getelementptr inbounds float, ptr [[A]], i64 [[TMP5]]
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; CHECK-NEXT: [[WIDE_LOAD:%.*]] = load <4 x float>, ptr [[TMP6]], align 4
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; CHECK-NEXT: [[TMP8:%.*]] = zext i32 [[TMP0]] to i64
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; CHECK-NEXT: [[TMP9:%.*]] = getelementptr inbounds float, ptr [[A]], i64 [[TMP8]]
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; CHECK-NEXT: store <4 x float> [[WIDE_LOAD]], ptr [[TMP9]], align 4
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; CHECK-NEXT: [[INDEX_NEXT]] = add nuw i64 [[OFFSET_IDX]], 4
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; CHECK-NEXT: [[TMP7:%.*]] = icmp eq i64 [[INDEX_NEXT]], 1000
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; CHECK-NEXT: br i1 [[TMP7]], 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 %[[EXIT:.*]]
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; CHECK: [[SCALAR_PH]]:
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; CHECK-NEXT: br label %[[LOOP:.*]]
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; CHECK: [[LOOP]]:
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; CHECK-NEXT: [[IV:%.*]] = phi i64 [ [[IV_NEXT:%.*]], %[[LOOP]] ], [ 0, %[[SCALAR_PH]] ]
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; CHECK-NEXT: [[IV_NEXT]] = add nuw nsw i64 [[IV]], 1
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; CHECK-NEXT: [[T_IV_NEXT:%.*]] = trunc i64 [[IV_NEXT]] to i32
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; CHECK-NEXT: [[MUL_IV_NEXT:%.*]] = mul i32 [[T_IV_NEXT]], [[X]]
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; CHECK-NEXT: [[IDX_1:%.*]] = zext i32 [[MUL_IV_NEXT]] to i64
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; CHECK-NEXT: [[ARRAYIDX1215:%.*]] = getelementptr inbounds float, ptr [[A]], i64 [[IDX_1]]
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; CHECK-NEXT: [[LV:%.*]] = load float, ptr [[ARRAYIDX1215]], align 4
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; CHECK-NEXT: [[T_IV:%.*]] = trunc i64 [[IV]] to i32
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; CHECK-NEXT: [[MUL_IV:%.*]] = mul i32 [[T_IV]], [[X]]
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; CHECK-NEXT: [[IDX_2:%.*]] = zext i32 [[MUL_IV]] to i64
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; CHECK-NEXT: [[ARRAYIDX1209:%.*]] = getelementptr inbounds float, ptr [[A]], i64 [[IDX_2]]
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; CHECK-NEXT: store float [[LV]], ptr [[ARRAYIDX1209]], align 4
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; CHECK-NEXT: [[EC:%.*]] = icmp eq i64 [[IV_NEXT]], 1000
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; CHECK-NEXT: br i1 [[EC]], label %[[EXIT]], label %[[LOOP]], !llvm.loop [[LOOP3:![0-9]+]]
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; CHECK: [[EXIT]]:
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; CHECK-NEXT: ret void
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;
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entry:
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br label %loop
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loop:
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%iv = phi i64 [ %iv.next, %loop ], [ 0, %entry ]
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%iv.next = add nuw nsw i64 %iv, 1
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%t.iv.next = trunc i64 %iv.next to i32
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%mul.iv.next = mul i32 %t.iv.next, %x
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%idx.1 = zext i32 %mul.iv.next to i64
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%arrayidx1215 = getelementptr inbounds float, ptr %A, i64 %idx.1
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%lv = load float, ptr %arrayidx1215, align 4
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%t.iv = trunc i64 %iv to i32
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%mul.iv = mul i32 %t.iv, %x
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%idx.2 = zext i32 %mul.iv to i64
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%arrayidx1209 = getelementptr inbounds float, ptr %A, i64 %idx.2
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store float %lv, ptr %arrayidx1209, align 4
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%ec = icmp eq i64 %iv.next, 1000
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br i1 %ec, label %exit, label %loop
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exit:
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ret void
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}
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; !llvm.loop.unroll.runtime.disable metadata should be added to the
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; scalar loop, as there are no runtime checks needed (or they can be proven
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; false).
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define void @diff_memcheck_known_false_for_vf_4(ptr %B, ptr %A, ptr %end) {
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; CHECK-LABEL: define void @diff_memcheck_known_false_for_vf_4(
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; CHECK-SAME: ptr [[B:%.*]], ptr [[A:%.*]], ptr [[END:%.*]]) {
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; CHECK-NEXT: [[ENTRY:.*]]:
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; CHECK-NEXT: [[END1:%.*]] = ptrtoint ptr [[END]] to i64
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; CHECK-NEXT: [[A_INT:%.*]] = ptrtoint ptr [[A]] to i64
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; CHECK-NEXT: [[B_CAST:%.*]] = ptrtoint ptr [[B]] to i64
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; CHECK-NEXT: [[PTR_SUB:%.*]] = sub i64 [[A_INT]], [[B_CAST]]
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; CHECK-NEXT: [[ADD_PTR11:%.*]] = getelementptr i8, ptr [[B]], i64 [[PTR_SUB]]
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; CHECK-NEXT: [[TMP0:%.*]] = sub i64 [[A_INT]], [[END1]]
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; CHECK-NEXT: [[TMP1:%.*]] = lshr i64 [[TMP0]], 3
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; CHECK-NEXT: [[TMP2:%.*]] = add nuw nsw i64 [[TMP1]], 1
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; CHECK-NEXT: [[MIN_ITERS_CHECK:%.*]] = icmp ult i64 [[TMP2]], 4
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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 [[TMP2]], 4
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; CHECK-NEXT: [[N_VEC:%.*]] = sub i64 [[TMP2]], [[N_MOD_VF]]
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; CHECK-NEXT: [[TMP3:%.*]] = mul i64 [[N_VEC]], -8
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; CHECK-NEXT: [[TMP4:%.*]] = getelementptr i8, ptr [[A]], i64 [[TMP3]]
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; CHECK-NEXT: [[TMP5:%.*]] = mul i64 [[N_VEC]], -8
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; CHECK-NEXT: [[TMP6:%.*]] = getelementptr i8, ptr [[ADD_PTR11]], i64 [[TMP5]]
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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: [[OFFSET_IDX:%.*]] = mul i64 [[INDEX]], -8
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; CHECK-NEXT: [[NEXT_GEP:%.*]] = getelementptr i8, ptr [[A]], i64 [[OFFSET_IDX]]
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; CHECK-NEXT: [[TMP7:%.*]] = getelementptr i64, ptr [[NEXT_GEP]], i32 0
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; CHECK-NEXT: [[TMP8:%.*]] = getelementptr i64, ptr [[TMP7]], i32 -3
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; CHECK-NEXT: store <4 x i64> zeroinitializer, ptr [[TMP8]], align 8
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; CHECK-NEXT: [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 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 [[LOOP4:![0-9]+]]
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; CHECK: [[MIDDLE_BLOCK]]:
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; CHECK-NEXT: [[CMP_N:%.*]] = icmp eq i64 [[TMP2]], [[N_VEC]]
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; CHECK-NEXT: br i1 [[CMP_N]], label %[[EXIT:.*]], label %[[SCALAR_PH]]
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; CHECK: [[SCALAR_PH]]:
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; CHECK-NEXT: [[BC_RESUME_VAL:%.*]] = phi ptr [ [[TMP4]], %[[MIDDLE_BLOCK]] ], [ [[A]], %[[ENTRY]] ]
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; CHECK-NEXT: [[BC_RESUME_VAL2:%.*]] = phi ptr [ [[TMP6]], %[[MIDDLE_BLOCK]] ], [ [[ADD_PTR11]], %[[ENTRY]] ]
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; CHECK-NEXT: br label %[[LOOP:.*]]
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; CHECK: [[LOOP]]:
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; CHECK-NEXT: [[IV_1:%.*]] = phi ptr [ [[IV_1_NEXT:%.*]], %[[LOOP]] ], [ [[BC_RESUME_VAL]], %[[SCALAR_PH]] ]
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; CHECK-NEXT: [[IV_2:%.*]] = phi ptr [ [[IV_2_NEXT:%.*]], %[[LOOP]] ], [ [[BC_RESUME_VAL2]], %[[SCALAR_PH]] ]
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; CHECK-NEXT: [[IV_2_NEXT]] = getelementptr nusw i8, ptr [[IV_2]], i64 -8
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; CHECK-NEXT: [[IV_1_NEXT]] = getelementptr i8, ptr [[IV_1]], i64 -8
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; CHECK-NEXT: [[TMP10:%.*]] = load i64, ptr [[IV_2_NEXT]], align 8
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; CHECK-NEXT: store i64 0, ptr [[IV_1]], align 8
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; CHECK-NEXT: [[CMP_NOT_I_I_I_I:%.*]] = icmp eq ptr [[END]], [[IV_2]]
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; CHECK-NEXT: br i1 [[CMP_NOT_I_I_I_I]], label %[[EXIT]], label %[[LOOP]], !llvm.loop [[LOOP5:![0-9]+]]
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; CHECK: [[EXIT]]:
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; CHECK-NEXT: ret void
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;
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entry:
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%A.int = ptrtoint ptr %A to i64
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%B.cast = ptrtoint ptr %B to i64
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%ptr.sub = sub i64 %A.int, %B.cast
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%add.ptr11 = getelementptr i8, ptr %B, i64 %ptr.sub
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br label %loop
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loop:
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%iv.1 = phi ptr [ %iv.1.next, %loop ], [ %A, %entry ]
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%iv.2 = phi ptr [ %iv.2.next, %loop ], [ %add.ptr11, %entry ]
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%iv.2.next = getelementptr nusw i8, ptr %iv.2, i64 -8
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%iv.1.next = getelementptr i8, ptr %iv.1, i64 -8
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%2 = load i64, ptr %iv.2.next, align 8
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store i64 0, ptr %iv.1, align 8
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%cmp.not.i.i.i.i = icmp eq ptr %end, %iv.2
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br i1 %cmp.not.i.i.i.i, label %exit, label %loop
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exit:
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ret void
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}
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;.
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; CHECK: [[LOOP0]] = distinct !{[[LOOP0]], [[META1:![0-9]+]], [[META2:![0-9]+]]}
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; CHECK: [[META1]] = !{!"llvm.loop.isvectorized", i32 1}
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; CHECK: [[META2]] = !{!"llvm.loop.unroll.runtime.disable"}
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; CHECK: [[LOOP3]] = distinct !{[[LOOP3]], [[META1]]}
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; CHECK: [[LOOP4]] = distinct !{[[LOOP4]], [[META1]], [[META2]]}
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; CHECK: [[LOOP5]] = distinct !{[[LOOP5]], [[META2]], [[META1]]}
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;.
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