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
5.4 KiB
LLVM
98 lines
5.4 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt < %s -passes=loop-vectorize -force-vector-interleave=4 -force-vector-width=1 -S | FileCheck --check-prefixes=CHECK,DEFAULT %s
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; RUN: opt < %s -passes=loop-vectorize -force-vector-interleave=4 -force-vector-width=1 -lv-strided-pointer-ivs=true -S | FileCheck --check-prefixes=CHECK,STRIDED %s
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target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
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; Test the scalar expansion of a non-constant stride pointer IV
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define void @non_constant_scalar_expansion(i32 %0, ptr %call) {
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; DEFAULT-LABEL: @non_constant_scalar_expansion(
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; DEFAULT-NEXT: entry:
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; DEFAULT-NEXT: [[MUL:%.*]] = shl i32 [[TMP0:%.*]], 1
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; DEFAULT-NEXT: br label [[FOR_COND:%.*]]
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; DEFAULT: for.cond:
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; DEFAULT-NEXT: [[TMP1:%.*]] = phi i32 [ 30, [[ENTRY:%.*]] ], [ [[INC:%.*]], [[FOR_COND]] ]
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; DEFAULT-NEXT: [[P_0:%.*]] = phi ptr [ null, [[ENTRY]] ], [ [[ADD_PTR:%.*]], [[FOR_COND]] ]
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; DEFAULT-NEXT: [[ADD_PTR]] = getelementptr i8, ptr [[P_0]], i32 [[MUL]]
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; DEFAULT-NEXT: [[ARRAYIDX:%.*]] = getelementptr ptr, ptr [[CALL:%.*]], i32 [[TMP1]]
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; DEFAULT-NEXT: store ptr [[P_0]], ptr [[ARRAYIDX]], align 4
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; DEFAULT-NEXT: [[INC]] = add i32 [[TMP1]], 1
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; DEFAULT-NEXT: [[TOBOOL_NOT:%.*]] = icmp eq i32 [[TMP1]], 0
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; DEFAULT-NEXT: br i1 [[TOBOOL_NOT]], label [[FOR_END:%.*]], label [[FOR_COND]]
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; DEFAULT: for.end:
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; DEFAULT-NEXT: ret void
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;
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; STRIDED-LABEL: @non_constant_scalar_expansion(
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; STRIDED-NEXT: entry:
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; STRIDED-NEXT: [[MUL:%.*]] = shl i32 [[TMP0:%.*]], 1
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; STRIDED-NEXT: [[TMP1:%.*]] = sext i32 [[MUL]] to i64
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; STRIDED-NEXT: br label [[VECTOR_PH:%.*]]
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; STRIDED: vector.ph:
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; STRIDED-NEXT: [[TMP2:%.*]] = mul i64 4294967264, [[TMP1]]
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; STRIDED-NEXT: [[IND_END:%.*]] = getelementptr i8, ptr null, i64 [[TMP2]]
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; STRIDED-NEXT: br label [[VECTOR_BODY:%.*]]
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; STRIDED: vector.body:
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; STRIDED-NEXT: [[INDEX:%.*]] = phi i64 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], [[VECTOR_BODY]] ]
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; STRIDED-NEXT: [[DOTCAST:%.*]] = trunc i64 [[INDEX]] to i32
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; STRIDED-NEXT: [[OFFSET_IDX:%.*]] = add i32 30, [[DOTCAST]]
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; STRIDED-NEXT: [[TMP4:%.*]] = add i32 [[OFFSET_IDX]], 1
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; STRIDED-NEXT: [[TMP5:%.*]] = add i32 [[OFFSET_IDX]], 2
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; STRIDED-NEXT: [[TMP6:%.*]] = add i32 [[OFFSET_IDX]], 3
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; STRIDED-NEXT: [[OFFSET_IDX2:%.*]] = mul i64 [[INDEX]], [[TMP1]]
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; STRIDED-NEXT: [[TMP9:%.*]] = mul i64 1, [[TMP1]]
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; STRIDED-NEXT: [[TMP10:%.*]] = add i64 [[OFFSET_IDX2]], [[TMP9]]
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; STRIDED-NEXT: [[TMP11:%.*]] = mul i64 2, [[TMP1]]
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; STRIDED-NEXT: [[TMP12:%.*]] = add i64 [[OFFSET_IDX2]], [[TMP11]]
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; STRIDED-NEXT: [[TMP13:%.*]] = mul i64 3, [[TMP1]]
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; STRIDED-NEXT: [[TMP14:%.*]] = add i64 [[OFFSET_IDX2]], [[TMP13]]
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; STRIDED-NEXT: [[TMP15:%.*]] = getelementptr i8, ptr null, i64 [[OFFSET_IDX2]]
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; STRIDED-NEXT: [[TMP16:%.*]] = getelementptr i8, ptr null, i64 [[TMP10]]
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; STRIDED-NEXT: [[TMP17:%.*]] = getelementptr i8, ptr null, i64 [[TMP12]]
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; STRIDED-NEXT: [[TMP18:%.*]] = getelementptr i8, ptr null, i64 [[TMP14]]
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; STRIDED-NEXT: [[TMP19:%.*]] = getelementptr ptr, ptr [[CALL:%.*]], i32 [[OFFSET_IDX]]
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; STRIDED-NEXT: [[TMP20:%.*]] = getelementptr ptr, ptr [[CALL]], i32 [[TMP4]]
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; STRIDED-NEXT: [[TMP21:%.*]] = getelementptr ptr, ptr [[CALL]], i32 [[TMP5]]
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; STRIDED-NEXT: [[TMP22:%.*]] = getelementptr ptr, ptr [[CALL]], i32 [[TMP6]]
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; STRIDED-NEXT: store ptr [[TMP15]], ptr [[TMP19]], align 4
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; STRIDED-NEXT: store ptr [[TMP16]], ptr [[TMP20]], align 4
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; STRIDED-NEXT: store ptr [[TMP17]], ptr [[TMP21]], align 4
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; STRIDED-NEXT: store ptr [[TMP18]], ptr [[TMP22]], align 4
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; STRIDED-NEXT: [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 4
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; STRIDED-NEXT: [[TMP23:%.*]] = icmp eq i64 [[INDEX_NEXT]], 4294967264
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; STRIDED-NEXT: br i1 [[TMP23]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], !llvm.loop [[LOOP0:![0-9]+]]
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; STRIDED: middle.block:
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; STRIDED-NEXT: br label [[SCALAR_PH:%.*]]
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; STRIDED: scalar.ph:
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; STRIDED-NEXT: br label [[FOR_COND:%.*]]
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; STRIDED: for.cond:
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; STRIDED-NEXT: [[TMP24:%.*]] = phi i32 [ -2, [[SCALAR_PH]] ], [ [[INC:%.*]], [[FOR_COND]] ]
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; STRIDED-NEXT: [[P_0:%.*]] = phi ptr [ [[IND_END]], [[SCALAR_PH]] ], [ [[ADD_PTR:%.*]], [[FOR_COND]] ]
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; STRIDED-NEXT: [[ADD_PTR]] = getelementptr i8, ptr [[P_0]], i32 [[MUL]]
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; STRIDED-NEXT: [[ARRAYIDX:%.*]] = getelementptr ptr, ptr [[CALL]], i32 [[TMP24]]
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; STRIDED-NEXT: store ptr [[P_0]], ptr [[ARRAYIDX]], align 4
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; STRIDED-NEXT: [[INC]] = add i32 [[TMP24]], 1
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; STRIDED-NEXT: [[TOBOOL_NOT:%.*]] = icmp eq i32 [[TMP24]], 0
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; STRIDED-NEXT: br i1 [[TOBOOL_NOT]], label [[FOR_END:%.*]], label [[FOR_COND]], !llvm.loop [[LOOP3:![0-9]+]]
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; STRIDED: for.end:
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; STRIDED-NEXT: ret void
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;
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entry:
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%mul = shl i32 %0, 1
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br label %for.cond
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for.cond: ; preds = %for.body, %entry
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%1 = phi i32 [ 30, %entry ], [ %inc, %for.cond ]
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%p.0 = phi ptr [ null, %entry ], [ %add.ptr, %for.cond ]
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%add.ptr = getelementptr i8, ptr %p.0, i32 %mul
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%arrayidx = getelementptr ptr, ptr %call, i32 %1
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store ptr %p.0, ptr %arrayidx, align 4
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%inc = add i32 %1, 1
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%tobool.not = icmp eq i32 %1, 0
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br i1 %tobool.not, label %for.end, label %for.cond
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for.end: ; preds = %for.cond
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ret void
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}
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;; NOTE: These prefixes are unused and the list is autogenerated. Do not add tests below this line:
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; CHECK: {{.*}}
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