derek.holloway
7502bf64a4
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82 lines
3.4 KiB
LLVM
82 lines
3.4 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 6
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; RUN: opt < %s -S -passes=loop-interchange \
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; RUN: -loop-interchange-profitabilities=ignore | FileCheck %s
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; This is a 3-level nested loop (i, j, k) with a reduction variable. The
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; reduction variable involves the outer loop (i) and the middle loop (j), but
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; not the innermost loop (k). Previously, the loop interchange pass crashed
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; when trying to interchange the i-loop and the j-loop. This test ensures that
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; the loop interchange pass can handle such a case.
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define void @f() {
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; CHECK-LABEL: define void @f() {
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; CHECK-NEXT: [[ENTRY:.*:]]
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; CHECK-NEXT: br label %[[LOOP_J_HEADER_PREHEADER:.*]]
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; CHECK: [[LOOP_I_HEADER_PREHEADER:.*]]:
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; CHECK-NEXT: br label %[[LOOP_I_HEADER:.*]]
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; CHECK: [[LOOP_I_HEADER]]:
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; CHECK-NEXT: [[I:%.*]] = phi i64 [ [[I_INC:%.*]], %[[LOOP_I_LATCH:.*]] ], [ 0, %[[LOOP_I_HEADER_PREHEADER]] ]
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; CHECK-NEXT: [[RED_J:%.*]] = phi i8 [ [[RED_J_NEXT:%.*]], %[[LOOP_I_LATCH]] ], [ [[RED_I:%.*]], %[[LOOP_I_HEADER_PREHEADER]] ]
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; CHECK-NEXT: br label %[[LOOP_K:.*]]
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; CHECK: [[LOOP_J_HEADER_PREHEADER]]:
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; CHECK-NEXT: br label %[[LOOP_J_HEADER:.*]]
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; CHECK: [[LOOP_J_HEADER]]:
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; CHECK-NEXT: [[J:%.*]] = phi i64 [ [[TMP0:%.*]], %[[LOOP_J_LATCH_SPLIT:.*]] ], [ 0, %[[LOOP_J_HEADER_PREHEADER]] ]
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; CHECK-NEXT: [[RED_I]] = phi i8 [ [[RED_J_NEXT_LCSSA:%.*]], %[[LOOP_J_LATCH_SPLIT]] ], [ 0, %[[LOOP_J_HEADER_PREHEADER]] ]
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; CHECK-NEXT: br label %[[LOOP_I_HEADER_PREHEADER]]
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; CHECK: [[LOOP_K]]:
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; CHECK-NEXT: [[K:%.*]] = phi i64 [ 0, %[[LOOP_I_HEADER]] ], [ [[K_INC:%.*]], %[[LOOP_K]] ]
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; CHECK-NEXT: [[K_INC]] = add i64 [[K]], 1
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; CHECK-NEXT: [[EC_K:%.*]] = icmp eq i64 [[K_INC]], 10
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; CHECK-NEXT: br i1 [[EC_K]], label %[[LOOP_J_LATCH:.*]], label %[[LOOP_K]]
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; CHECK: [[LOOP_J_LATCH]]:
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; CHECK-NEXT: [[RED_J_NEXT]] = or i8 [[RED_J]], 42
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; CHECK-NEXT: [[J_INC:%.*]] = add i64 [[J]], 1
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; CHECK-NEXT: [[EC_J:%.*]] = icmp eq i64 [[J_INC]], 20
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; CHECK-NEXT: br label %[[LOOP_I_LATCH]]
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; CHECK: [[LOOP_J_LATCH_SPLIT]]:
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; CHECK-NEXT: [[RED_J_NEXT_LCSSA]] = phi i8 [ [[RED_J_NEXT]], %[[LOOP_I_LATCH]] ]
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; CHECK-NEXT: [[TMP0]] = add i64 [[J]], 1
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; CHECK-NEXT: [[TMP1:%.*]] = icmp eq i64 [[TMP0]], 20
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; CHECK-NEXT: br i1 [[TMP1]], label %[[EXIT:.*]], label %[[LOOP_J_HEADER]]
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; CHECK: [[LOOP_I_LATCH]]:
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; CHECK-NEXT: [[I_INC]] = add i64 [[I]], 1
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; CHECK-NEXT: [[EC_I:%.*]] = icmp eq i64 [[I_INC]], 30
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; CHECK-NEXT: br i1 [[EC_I]], label %[[LOOP_J_LATCH_SPLIT]], label %[[LOOP_I_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 %loop.i.header
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loop.i.header:
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%i = phi i64 [ 0, %entry ], [ %i.inc, %loop.i.latch ]
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%red.i = phi i8 [ 0, %entry ], [ %red.j.next, %loop.i.latch ]
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br label %loop.j.header
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loop.j.header:
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%j = phi i64 [ 0, %loop.i.header ], [ %j.inc, %loop.j.latch ]
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%red.j = phi i8 [ %red.i, %loop.i.header ], [ %red.j.next, %loop.j.latch ]
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br label %loop.k
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loop.k:
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%k = phi i64 [ 0, %loop.j.header ], [ %k.inc, %loop.k ]
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%k.inc = add i64 %k, 1
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%ec.k = icmp eq i64 %k.inc, 10
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br i1 %ec.k, label %loop.j.latch, label %loop.k
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loop.j.latch:
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%red.j.next = or i8 %red.j, 42
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%j.inc = add i64 %j, 1
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%ec.j = icmp eq i64 %j.inc, 20
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br i1 %ec.j, label %loop.i.latch, label %loop.j.header
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loop.i.latch:
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%i.inc = add i64 %i, 1
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%ec.i = icmp eq i64 %i.inc, 30
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br i1 %ec.i, label %exit, label %loop.i.header
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exit:
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ret void
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}
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