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[LoopUnroll] Add additional test with one unpredictable exit (NFC)
One exit is unpredictable, the other has a known trip count. For one function the predictable exit is the latch exit, for the other the non-latch exit. Currently they are treated differently.
This commit is contained in:
Nikita Popov
parent
dd23a07d05
commit
6b76b629b6
@ -1,68 +0,0 @@
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -S -loop-unroll %s | FileCheck %s
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; Full unrolling can be performed against the header exit here, but we have
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; both multiple exits and a latch exit. After full unrolling, this function
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; folds to ret i1 true.
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define i1 @test() {
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; CHECK-LABEL: @test(
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; CHECK-NEXT: start:
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; CHECK-NEXT: [[A1:%.*]] = alloca [2 x i64], align 8
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; CHECK-NEXT: [[A2:%.*]] = alloca [2 x i64], align 8
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; CHECK-NEXT: [[A1_0:%.*]] = getelementptr inbounds [2 x i64], [2 x i64]* [[A1]], i64 0, i64 0
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; CHECK-NEXT: store i64 -5015437470765251660, i64* [[A1_0]], align 8
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; CHECK-NEXT: [[A1_1:%.*]] = getelementptr inbounds [2 x i64], [2 x i64]* [[A1]], i64 0, i64 1
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; CHECK-NEXT: store i64 -8661621401413125213, i64* [[A1_1]], align 8
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; CHECK-NEXT: [[A2_0:%.*]] = getelementptr inbounds [2 x i64], [2 x i64]* [[A2]], i64 0, i64 0
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; CHECK-NEXT: store i64 -5015437470765251660, i64* [[A2_0]], align 8
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; CHECK-NEXT: [[A2_1:%.*]] = getelementptr inbounds [2 x i64], [2 x i64]* [[A2]], i64 0, i64 1
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; CHECK-NEXT: store i64 -8661621401413125213, i64* [[A2_1]], align 8
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; CHECK-NEXT: br label [[LOOP:%.*]]
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; CHECK: loop:
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; CHECK-NEXT: [[IV:%.*]] = phi i64 [ 0, [[START:%.*]] ], [ [[IV_NEXT:%.*]], [[LATCH:%.*]] ]
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; CHECK-NEXT: [[EXITCOND:%.*]] = icmp eq i64 [[IV]], 2
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; CHECK-NEXT: br i1 [[EXITCOND]], label [[EXIT:%.*]], label [[LATCH]]
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; CHECK: latch:
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; CHECK-NEXT: [[IV_NEXT]] = add nuw nsw i64 [[IV]], 1
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; CHECK-NEXT: [[GEP1:%.*]] = getelementptr inbounds [2 x i64], [2 x i64]* [[A1]], i64 0, i64 [[IV]]
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; CHECK-NEXT: [[GEP2:%.*]] = getelementptr inbounds [2 x i64], [2 x i64]* [[A2]], i64 0, i64 [[IV]]
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; CHECK-NEXT: [[LOAD1:%.*]] = load i64, i64* [[GEP1]], align 8
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; CHECK-NEXT: [[LOAD2:%.*]] = load i64, i64* [[GEP2]], align 8
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; CHECK-NEXT: [[EXITCOND2:%.*]] = icmp eq i64 [[LOAD1]], [[LOAD2]]
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; CHECK-NEXT: br i1 [[EXITCOND2]], label [[LOOP]], label [[EXIT]]
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; CHECK: exit:
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; CHECK-NEXT: [[EXIT_VAL:%.*]] = phi i1 [ false, [[LATCH]] ], [ true, [[LOOP]] ]
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; CHECK-NEXT: ret i1 [[EXIT_VAL]]
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;
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start:
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%a1 = alloca [2 x i64], align 8
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%a2 = alloca [2 x i64], align 8
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%a1.0 = getelementptr inbounds [2 x i64], [2 x i64]* %a1, i64 0, i64 0
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store i64 -5015437470765251660, i64* %a1.0, align 8
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%a1.1 = getelementptr inbounds [2 x i64], [2 x i64]* %a1, i64 0, i64 1
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store i64 -8661621401413125213, i64* %a1.1, align 8
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%a2.0 = getelementptr inbounds [2 x i64], [2 x i64]* %a2, i64 0, i64 0
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store i64 -5015437470765251660, i64* %a2.0, align 8
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%a2.1 = getelementptr inbounds [2 x i64], [2 x i64]* %a2, i64 0, i64 1
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store i64 -8661621401413125213, i64* %a2.1, align 8
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br label %loop
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loop:
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%iv = phi i64 [ 0, %start ], [ %iv.next, %latch ]
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%exitcond = icmp eq i64 %iv, 2
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br i1 %exitcond, label %exit, label %latch
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latch:
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%iv.next = add nuw nsw i64 %iv, 1
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%gep1 = getelementptr inbounds [2 x i64], [2 x i64]* %a1, i64 0, i64 %iv
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%gep2 = getelementptr inbounds [2 x i64], [2 x i64]* %a2, i64 0, i64 %iv
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%load1 = load i64, i64* %gep1, align 8
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%load2 = load i64, i64* %gep2, align 8
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%exitcond2 = icmp eq i64 %load1, %load2
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br i1 %exitcond2, label %loop, label %exit
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exit:
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%exit.val = phi i1 [ false, %latch ], [ true, %loop ]
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ret i1 %exit.val
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}
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135
test/Transforms/LoopUnroll/full-unroll-one-unpredictable-exit.ll
Normal file
135
test/Transforms/LoopUnroll/full-unroll-one-unpredictable-exit.ll
Normal file
@ -0,0 +1,135 @@
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -S -loop-unroll %s | FileCheck %s
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; In both cases, we have one unpredictable exit and one IV-based exit with
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; known trip count. We can fully unroll against the latter. In one of the
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; examples the IV-based exit is the latch exit, in the other the non-latch
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; exit. After full unrolling, the functions fold to ret i1 true.
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define i1 @test_latch() {
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; CHECK-LABEL: @test_latch(
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; CHECK-NEXT: start:
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; CHECK-NEXT: [[A1:%.*]] = alloca [2 x i64], align 8
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; CHECK-NEXT: [[A2:%.*]] = alloca [2 x i64], align 8
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; CHECK-NEXT: [[A1_0:%.*]] = getelementptr inbounds [2 x i64], [2 x i64]* [[A1]], i64 0, i64 0
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; CHECK-NEXT: store i64 -5015437470765251660, i64* [[A1_0]], align 8
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; CHECK-NEXT: [[A1_1:%.*]] = getelementptr inbounds [2 x i64], [2 x i64]* [[A1]], i64 0, i64 1
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; CHECK-NEXT: store i64 -8661621401413125213, i64* [[A1_1]], align 8
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; CHECK-NEXT: [[A2_0:%.*]] = getelementptr inbounds [2 x i64], [2 x i64]* [[A2]], i64 0, i64 0
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; CHECK-NEXT: store i64 -5015437470765251660, i64* [[A2_0]], align 8
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; CHECK-NEXT: [[A2_1:%.*]] = getelementptr inbounds [2 x i64], [2 x i64]* [[A2]], i64 0, i64 1
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; CHECK-NEXT: store i64 -8661621401413125213, i64* [[A2_1]], align 8
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; CHECK-NEXT: br label [[LOOP:%.*]]
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; CHECK: loop:
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; CHECK-NEXT: [[GEP1:%.*]] = getelementptr inbounds [2 x i64], [2 x i64]* [[A1]], i64 0, i64 0
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; CHECK-NEXT: [[GEP2:%.*]] = getelementptr inbounds [2 x i64], [2 x i64]* [[A2]], i64 0, i64 0
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; CHECK-NEXT: [[LOAD1:%.*]] = load i64, i64* [[GEP1]], align 8
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; CHECK-NEXT: [[LOAD2:%.*]] = load i64, i64* [[GEP2]], align 8
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; CHECK-NEXT: [[EXITCOND2:%.*]] = icmp eq i64 [[LOAD1]], [[LOAD2]]
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; CHECK-NEXT: br i1 [[EXITCOND2]], label [[LATCH:%.*]], label [[EXIT:%.*]]
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; CHECK: latch:
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; CHECK-NEXT: [[GEP1_1:%.*]] = getelementptr inbounds [2 x i64], [2 x i64]* [[A1]], i64 0, i64 1
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; CHECK-NEXT: [[GEP2_1:%.*]] = getelementptr inbounds [2 x i64], [2 x i64]* [[A2]], i64 0, i64 1
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; CHECK-NEXT: [[LOAD1_1:%.*]] = load i64, i64* [[GEP1_1]], align 8
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; CHECK-NEXT: [[LOAD2_1:%.*]] = load i64, i64* [[GEP2_1]], align 8
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; CHECK-NEXT: [[EXITCOND2_1:%.*]] = icmp eq i64 [[LOAD1_1]], [[LOAD2_1]]
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; CHECK-NEXT: br i1 [[EXITCOND2_1]], label [[LATCH_1:%.*]], label [[EXIT]]
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; CHECK: exit:
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; CHECK-NEXT: [[EXIT_VAL:%.*]] = phi i1 [ false, [[LOOP]] ], [ false, [[LATCH]] ], [ true, [[LATCH_1]] ]
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; CHECK-NEXT: ret i1 [[EXIT_VAL]]
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; CHECK: latch.1:
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; CHECK-NEXT: br label [[EXIT]]
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;
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start:
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%a1 = alloca [2 x i64], align 8
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%a2 = alloca [2 x i64], align 8
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%a1.0 = getelementptr inbounds [2 x i64], [2 x i64]* %a1, i64 0, i64 0
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store i64 -5015437470765251660, i64* %a1.0, align 8
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%a1.1 = getelementptr inbounds [2 x i64], [2 x i64]* %a1, i64 0, i64 1
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store i64 -8661621401413125213, i64* %a1.1, align 8
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%a2.0 = getelementptr inbounds [2 x i64], [2 x i64]* %a2, i64 0, i64 0
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store i64 -5015437470765251660, i64* %a2.0, align 8
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%a2.1 = getelementptr inbounds [2 x i64], [2 x i64]* %a2, i64 0, i64 1
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store i64 -8661621401413125213, i64* %a2.1, align 8
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br label %loop
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loop:
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%iv = phi i64 [ 0, %start ], [ %iv.next, %latch ]
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%gep1 = getelementptr inbounds [2 x i64], [2 x i64]* %a1, i64 0, i64 %iv
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%gep2 = getelementptr inbounds [2 x i64], [2 x i64]* %a2, i64 0, i64 %iv
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%load1 = load i64, i64* %gep1, align 8
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%load2 = load i64, i64* %gep2, align 8
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%exitcond2 = icmp eq i64 %load1, %load2
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br i1 %exitcond2, label %latch, label %exit
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latch:
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%iv.next = add nuw nsw i64 %iv, 1
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%exitcond = icmp eq i64 %iv.next, 2
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br i1 %exitcond, label %exit, label %loop
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exit:
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%exit.val = phi i1 [ true, %latch ], [ false, %loop ]
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ret i1 %exit.val
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}
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define i1 @test_non_latch() {
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; CHECK-LABEL: @test_non_latch(
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; CHECK-NEXT: start:
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; CHECK-NEXT: [[A1:%.*]] = alloca [2 x i64], align 8
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; CHECK-NEXT: [[A2:%.*]] = alloca [2 x i64], align 8
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; CHECK-NEXT: [[A1_0:%.*]] = getelementptr inbounds [2 x i64], [2 x i64]* [[A1]], i64 0, i64 0
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; CHECK-NEXT: store i64 -5015437470765251660, i64* [[A1_0]], align 8
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; CHECK-NEXT: [[A1_1:%.*]] = getelementptr inbounds [2 x i64], [2 x i64]* [[A1]], i64 0, i64 1
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; CHECK-NEXT: store i64 -8661621401413125213, i64* [[A1_1]], align 8
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; CHECK-NEXT: [[A2_0:%.*]] = getelementptr inbounds [2 x i64], [2 x i64]* [[A2]], i64 0, i64 0
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; CHECK-NEXT: store i64 -5015437470765251660, i64* [[A2_0]], align 8
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; CHECK-NEXT: [[A2_1:%.*]] = getelementptr inbounds [2 x i64], [2 x i64]* [[A2]], i64 0, i64 1
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; CHECK-NEXT: store i64 -8661621401413125213, i64* [[A2_1]], align 8
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; CHECK-NEXT: br label [[LOOP:%.*]]
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; CHECK: loop:
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; CHECK-NEXT: [[IV:%.*]] = phi i64 [ 0, [[START:%.*]] ], [ [[IV_NEXT:%.*]], [[LATCH:%.*]] ]
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; CHECK-NEXT: [[EXITCOND:%.*]] = icmp eq i64 [[IV]], 2
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; CHECK-NEXT: br i1 [[EXITCOND]], label [[EXIT:%.*]], label [[LATCH]]
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; CHECK: latch:
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; CHECK-NEXT: [[IV_NEXT]] = add nuw nsw i64 [[IV]], 1
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; CHECK-NEXT: [[GEP1:%.*]] = getelementptr inbounds [2 x i64], [2 x i64]* [[A1]], i64 0, i64 [[IV]]
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; CHECK-NEXT: [[GEP2:%.*]] = getelementptr inbounds [2 x i64], [2 x i64]* [[A2]], i64 0, i64 [[IV]]
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; CHECK-NEXT: [[LOAD1:%.*]] = load i64, i64* [[GEP1]], align 8
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; CHECK-NEXT: [[LOAD2:%.*]] = load i64, i64* [[GEP2]], align 8
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; CHECK-NEXT: [[EXITCOND2:%.*]] = icmp eq i64 [[LOAD1]], [[LOAD2]]
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; CHECK-NEXT: br i1 [[EXITCOND2]], label [[LOOP]], label [[EXIT]]
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; CHECK: exit:
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; CHECK-NEXT: [[EXIT_VAL:%.*]] = phi i1 [ false, [[LATCH]] ], [ true, [[LOOP]] ]
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; CHECK-NEXT: ret i1 [[EXIT_VAL]]
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;
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start:
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%a1 = alloca [2 x i64], align 8
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%a2 = alloca [2 x i64], align 8
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%a1.0 = getelementptr inbounds [2 x i64], [2 x i64]* %a1, i64 0, i64 0
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store i64 -5015437470765251660, i64* %a1.0, align 8
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%a1.1 = getelementptr inbounds [2 x i64], [2 x i64]* %a1, i64 0, i64 1
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store i64 -8661621401413125213, i64* %a1.1, align 8
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%a2.0 = getelementptr inbounds [2 x i64], [2 x i64]* %a2, i64 0, i64 0
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store i64 -5015437470765251660, i64* %a2.0, align 8
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%a2.1 = getelementptr inbounds [2 x i64], [2 x i64]* %a2, i64 0, i64 1
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store i64 -8661621401413125213, i64* %a2.1, align 8
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br label %loop
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loop:
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%iv = phi i64 [ 0, %start ], [ %iv.next, %latch ]
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%exitcond = icmp eq i64 %iv, 2
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br i1 %exitcond, label %exit, label %latch
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latch:
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%iv.next = add nuw nsw i64 %iv, 1
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%gep1 = getelementptr inbounds [2 x i64], [2 x i64]* %a1, i64 0, i64 %iv
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%gep2 = getelementptr inbounds [2 x i64], [2 x i64]* %a2, i64 0, i64 %iv
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%load1 = load i64, i64* %gep1, align 8
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%load2 = load i64, i64* %gep2, align 8
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%exitcond2 = icmp eq i64 %load1, %load2
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br i1 %exitcond2, label %loop, label %exit
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exit:
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%exit.val = phi i1 [ false, %latch ], [ true, %loop ]
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ret i1 %exit.val
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}
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