156 lines
5.7 KiB
LLVM
156 lines
5.7 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt < %s -loop-deletion -verify-dom-info -S | FileCheck %s
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target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64"
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%pair_t = type { i64, i64 }
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; The loop %inner cannot be removed, because it has outgoing values. But the
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; outer loop is a no-op and can be removed.
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define void @test1(i64 %N, i64 %M, %pair_t* %ptr) willreturn {
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; CHECK-LABEL: @test1(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: br label [[EXIT:%.*]]
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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 %outer.header
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outer.header:
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%outer.iv = phi i64 [ 0, %entry ], [ %outer.iv.next, %outer.latch ]
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br label %inner
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inner:
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%inner.iv = phi i64 [ 0, %outer.header ], [ %inner.iv.next, %inner ]
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%gep = getelementptr %pair_t, %pair_t* %ptr, i64 %inner.iv
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%p = load %pair_t, %pair_t* %gep
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%v.0 = extractvalue %pair_t %p, 0
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%v.1 = extractvalue %pair_t %p, 1
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%inner.ec = icmp ult i64 %v.0, %v.1
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%inner.iv.next = add i64 %inner.iv, 1
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br i1 %inner.ec, label %outer.latch, label %inner
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outer.latch:
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%lcssa = phi i64 [ %v.1, %inner ]
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%outer.ec = icmp ult i64 %outer.iv, %lcssa
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%outer.iv.next = add i64 %outer.iv, 1
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br i1 %outer.ec, label %exit, label %outer.header
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exit:
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ret void
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}
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declare void @sideeffect()
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; Same as @test1, but with a call in the outer loop. Nothing can be deleted.
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define void @test2_sideeffect_in_outer(i64 %N, i64 %M, %pair_t* %ptr) willreturn {
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; CHECK-LABEL: @test2_sideeffect_in_outer(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: br label [[OUTER_HEADER:%.*]]
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; CHECK: outer.header:
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; CHECK-NEXT: [[OUTER_IV:%.*]] = phi i64 [ 0, [[ENTRY:%.*]] ], [ [[OUTER_IV_NEXT:%.*]], [[OUTER_LATCH:%.*]] ]
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; CHECK-NEXT: br label [[INNER:%.*]]
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; CHECK: inner:
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; CHECK-NEXT: [[INNER_IV:%.*]] = phi i64 [ 0, [[OUTER_HEADER]] ], [ [[INNER_IV_NEXT:%.*]], [[INNER]] ]
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; CHECK-NEXT: [[GEP:%.*]] = getelementptr [[PAIR_T:%.*]], %pair_t* [[PTR:%.*]], i64 [[INNER_IV]]
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; CHECK-NEXT: [[P:%.*]] = load [[PAIR_T]], %pair_t* [[GEP]], align 4
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; CHECK-NEXT: [[V_0:%.*]] = extractvalue [[PAIR_T]] [[P]], 0
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; CHECK-NEXT: [[V_1:%.*]] = extractvalue [[PAIR_T]] [[P]], 1
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; CHECK-NEXT: [[INNER_EC:%.*]] = icmp ult i64 [[V_0]], [[V_1]]
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; CHECK-NEXT: [[INNER_IV_NEXT]] = add i64 [[INNER_IV]], 1
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; CHECK-NEXT: br i1 [[INNER_EC]], label [[OUTER_LATCH]], label [[INNER]]
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; CHECK: outer.latch:
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; CHECK-NEXT: [[LCSSA:%.*]] = phi i64 [ [[V_1]], [[INNER]] ]
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; CHECK-NEXT: [[OUTER_EC:%.*]] = icmp ult i64 [[OUTER_IV]], [[LCSSA]]
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; CHECK-NEXT: [[OUTER_IV_NEXT]] = add i64 [[OUTER_IV]], 1
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; CHECK-NEXT: call void @sideeffect()
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; CHECK-NEXT: br i1 [[OUTER_EC]], label [[EXIT:%.*]], label [[OUTER_HEADER]]
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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 %outer.header
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outer.header:
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%outer.iv = phi i64 [ 0, %entry ], [ %outer.iv.next, %outer.latch ]
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br label %inner
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inner:
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%inner.iv = phi i64 [ 0, %outer.header ], [ %inner.iv.next, %inner ]
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%gep = getelementptr %pair_t, %pair_t* %ptr, i64 %inner.iv
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%p = load %pair_t, %pair_t* %gep
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%v.0 = extractvalue %pair_t %p, 0
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%v.1 = extractvalue %pair_t %p, 1
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%inner.ec = icmp ult i64 %v.0, %v.1
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%inner.iv.next = add i64 %inner.iv, 1
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br i1 %inner.ec, label %outer.latch, label %inner
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outer.latch:
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%lcssa = phi i64 [ %v.1, %inner ]
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%outer.ec = icmp ult i64 %outer.iv, %lcssa
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%outer.iv.next = add i64 %outer.iv, 1
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call void @sideeffect()
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br i1 %outer.ec, label %exit, label %outer.header
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exit:
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ret void
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}
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; Same as @test1, but with a call in the inner loop. Nothing can be deleted.
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define void @test3_sideeffect_in_inner(i64 %N, i64 %M, %pair_t* %ptr) willreturn {
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; CHECK-LABEL: @test3_sideeffect_in_inner(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: br label [[OUTER_HEADER:%.*]]
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; CHECK: outer.header:
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; CHECK-NEXT: [[OUTER_IV:%.*]] = phi i64 [ 0, [[ENTRY:%.*]] ], [ [[OUTER_IV_NEXT:%.*]], [[OUTER_LATCH:%.*]] ]
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; CHECK-NEXT: br label [[INNER:%.*]]
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; CHECK: inner:
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; CHECK-NEXT: [[INNER_IV:%.*]] = phi i64 [ 0, [[OUTER_HEADER]] ], [ [[INNER_IV_NEXT:%.*]], [[INNER]] ]
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; CHECK-NEXT: [[GEP:%.*]] = getelementptr [[PAIR_T:%.*]], %pair_t* [[PTR:%.*]], i64 [[INNER_IV]]
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; CHECK-NEXT: [[P:%.*]] = load [[PAIR_T]], %pair_t* [[GEP]], align 4
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; CHECK-NEXT: [[V_0:%.*]] = extractvalue [[PAIR_T]] [[P]], 0
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; CHECK-NEXT: [[V_1:%.*]] = extractvalue [[PAIR_T]] [[P]], 1
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; CHECK-NEXT: [[INNER_EC:%.*]] = icmp ult i64 [[V_0]], [[V_1]]
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; CHECK-NEXT: [[INNER_IV_NEXT]] = add i64 [[INNER_IV]], 1
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; CHECK-NEXT: call void @sideeffect()
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; CHECK-NEXT: br i1 [[INNER_EC]], label [[OUTER_LATCH]], label [[INNER]]
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; CHECK: outer.latch:
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; CHECK-NEXT: [[LCSSA:%.*]] = phi i64 [ [[V_1]], [[INNER]] ]
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; CHECK-NEXT: [[OUTER_EC:%.*]] = icmp ult i64 [[OUTER_IV]], [[LCSSA]]
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; CHECK-NEXT: [[OUTER_IV_NEXT]] = add i64 [[OUTER_IV]], 1
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; CHECK-NEXT: br i1 [[OUTER_EC]], label [[EXIT:%.*]], label [[OUTER_HEADER]]
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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 %outer.header
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outer.header:
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%outer.iv = phi i64 [ 0, %entry ], [ %outer.iv.next, %outer.latch ]
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br label %inner
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inner:
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%inner.iv = phi i64 [ 0, %outer.header ], [ %inner.iv.next, %inner ]
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%gep = getelementptr %pair_t, %pair_t* %ptr, i64 %inner.iv
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%p = load %pair_t, %pair_t* %gep
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%v.0 = extractvalue %pair_t %p, 0
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%v.1 = extractvalue %pair_t %p, 1
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%inner.ec = icmp ult i64 %v.0, %v.1
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%inner.iv.next = add i64 %inner.iv, 1
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call void @sideeffect()
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br i1 %inner.ec, label %outer.latch, label %inner
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outer.latch:
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%lcssa = phi i64 [ %v.1, %inner ]
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%outer.ec = icmp ult i64 %outer.iv, %lcssa
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%outer.iv.next = add i64 %outer.iv, 1
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br i1 %outer.ec, label %exit, label %outer.header
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exit:
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ret void
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}
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