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64 lines
2.2 KiB
LLVM
64 lines
2.2 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -indvars -S < %s | FileCheck %s
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; RUN: opt -passes=indvars -S < %s | FileCheck %s
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; TODO: should be able to remove the range check basing on the following facts:
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; 0 <= len <= MAX_INT [1];
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; iv starts from len and goes down stopping at zero and [1], therefore
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; 0 <= iv <= len [2];
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; 3. In range_check_block, iv != 0 and [2], therefore
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; 1 <= iv <= len [3];
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; 4. iv.next = iv - 1 and [3], therefore
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; 0 <= iv.next < len.
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define void @test_predicated_simple(i32* %p, i32* %arr) {
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; CHECK-LABEL: @test_predicated_simple(
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; CHECK-NEXT: preheader:
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; CHECK-NEXT: [[LEN:%.*]] = load i32, i32* [[P:%.*]], align 4, [[RNG0:!range !.*]]
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; CHECK-NEXT: br label [[LOOP:%.*]]
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; CHECK: loop:
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; CHECK-NEXT: [[IV:%.*]] = phi i32 [ [[LEN]], [[PREHEADER:%.*]] ], [ [[IV_NEXT:%.*]], [[BACKEDGE:%.*]] ]
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; CHECK-NEXT: [[ZERO_COND:%.*]] = icmp eq i32 [[IV]], 0
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; CHECK-NEXT: br i1 [[ZERO_COND]], label [[EXIT:%.*]], label [[RANGE_CHECK_BLOCK:%.*]]
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; CHECK: range_check_block:
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; CHECK-NEXT: [[IV_NEXT]] = sub i32 [[IV]], 1
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; CHECK-NEXT: [[RANGE_CHECK:%.*]] = icmp ult i32 [[IV_NEXT]], [[LEN]]
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; CHECK-NEXT: br i1 [[RANGE_CHECK]], label [[BACKEDGE]], label [[FAIL:%.*]]
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; CHECK: backedge:
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; CHECK-NEXT: [[EL_PTR:%.*]] = getelementptr i32, i32* [[P]], i32 [[IV]]
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; CHECK-NEXT: [[EL:%.*]] = load i32, i32* [[EL_PTR]], align 4
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; CHECK-NEXT: [[LOOP_COND:%.*]] = icmp eq i32 [[EL]], 0
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; CHECK-NEXT: br i1 [[LOOP_COND]], label [[LOOP]], label [[EXIT]]
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; CHECK: exit:
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; CHECK-NEXT: ret void
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; CHECK: fail:
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; CHECK-NEXT: unreachable
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;
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preheader:
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%len = load i32, i32* %p, !range !0
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br label %loop
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loop:
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%iv = phi i32 [%len, %preheader], [%iv.next, %backedge]
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%zero_cond = icmp eq i32 %iv, 0
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br i1 %zero_cond, label %exit, label %range_check_block
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range_check_block:
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%iv.next = sub i32 %iv, 1
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%range_check = icmp ult i32 %iv.next, %len
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br i1 %range_check, label %backedge, label %fail
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backedge:
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%el.ptr = getelementptr i32, i32* %p, i32 %iv
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%el = load i32, i32* %el.ptr
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%loop.cond = icmp eq i32 %el, 0
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br i1 %loop.cond, label %loop, label %exit
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exit:
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ret void
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fail:
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unreachable
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}
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!0 = !{i32 0, i32 2147483647}
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