69 lines
3.5 KiB
LLVM
69 lines
3.5 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 2
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; Check that the default heuristic use the local cse constraints.
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; RUN: opt -S -passes=reassociate %s -o - | FileCheck %s -check-prefix=LOCAL_CSE
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; RUN: opt -S -passes=reassociate %s -reassociate-use-cse-local=true -o - | FileCheck %s -check-prefix=LOCAL_CSE
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; RUN: opt -S -passes=reassociate %s -reassociate-use-cse-local=false -o - | FileCheck %s -check-prefix=CSE
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; In the local CSE mode, we check that we don't create loop dependent
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; expressions in order to expose more CSE opportunities.
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; This can be seen with %inv4 and %inv5 that should stay in the entry block.
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;
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; For the non-local CSE mode, we form CSE-able expression regardless of where
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; they would be materialized. In this case, %inv4 and %inv5 are pushed
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; down the loop body in order to make loop_dependent, %inv2 appear as a
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; sub-expression.
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;
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; Related to issue PR61458.
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define void @reassoc_defeats_licm(i64 %inv1, i64 %inv2, i64 %inv3) {
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; LOCAL_CSE-LABEL: define void @reassoc_defeats_licm
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; LOCAL_CSE-SAME: (i64 [[INV1:%.*]], i64 [[INV2:%.*]], i64 [[INV3:%.*]]) {
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; LOCAL_CSE-NEXT: bb:
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; LOCAL_CSE-NEXT: [[INV4:%.*]] = add nuw nsw i64 [[INV2]], [[INV1]]
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; LOCAL_CSE-NEXT: [[INV5:%.*]] = add nuw nsw i64 [[INV3]], [[INV2]]
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; LOCAL_CSE-NEXT: br label [[BB214:%.*]]
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; LOCAL_CSE: bb214:
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; LOCAL_CSE-NEXT: [[IV1:%.*]] = phi i64 [ [[IV2:%.*]], [[BB214]] ], [ 0, [[BB:%.*]] ]
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; LOCAL_CSE-NEXT: [[IV2]] = phi i64 [ [[IV2_PLUS_1:%.*]], [[BB214]] ], [ 1, [[BB]] ]
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; LOCAL_CSE-NEXT: [[LOOP_DEPENDENT:%.*]] = shl nuw nsw i64 [[IV1]], 13
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; LOCAL_CSE-NEXT: [[LOOP_DEPENDENT2:%.*]] = add nsw i64 [[INV4]], [[LOOP_DEPENDENT]]
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; LOCAL_CSE-NEXT: call void @keep_alive(i64 [[LOOP_DEPENDENT2]])
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; LOCAL_CSE-NEXT: [[LOOP_DEPENDENT3:%.*]] = add i64 [[INV5]], [[LOOP_DEPENDENT]]
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; LOCAL_CSE-NEXT: call void @keep_alive(i64 [[LOOP_DEPENDENT3]])
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; LOCAL_CSE-NEXT: [[IV2_PLUS_1]] = add i64 [[IV2]], 1
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; LOCAL_CSE-NEXT: br label [[BB214]]
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;
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; CSE-LABEL: define void @reassoc_defeats_licm
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; CSE-SAME: (i64 [[INV1:%.*]], i64 [[INV2:%.*]], i64 [[INV3:%.*]]) {
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; CSE-NEXT: bb:
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; CSE-NEXT: br label [[BB214:%.*]]
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; CSE: bb214:
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; CSE-NEXT: [[IV1:%.*]] = phi i64 [ [[IV2:%.*]], [[BB214]] ], [ 0, [[BB:%.*]] ]
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; CSE-NEXT: [[IV2]] = phi i64 [ [[IV2_PLUS_1:%.*]], [[BB214]] ], [ 1, [[BB]] ]
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; CSE-NEXT: [[LOOP_DEPENDENT:%.*]] = shl nuw nsw i64 [[IV1]], 13
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; CSE-NEXT: [[INV4:%.*]] = add i64 [[LOOP_DEPENDENT]], [[INV2]]
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; CSE-NEXT: [[LOOP_DEPENDENT2:%.*]] = add i64 [[INV4]], [[INV1]]
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; CSE-NEXT: call void @keep_alive(i64 [[LOOP_DEPENDENT2]])
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; CSE-NEXT: [[INV5:%.*]] = add i64 [[LOOP_DEPENDENT]], [[INV2]]
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; CSE-NEXT: [[LOOP_DEPENDENT3:%.*]] = add i64 [[INV5]], [[INV3]]
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; CSE-NEXT: call void @keep_alive(i64 [[LOOP_DEPENDENT3]])
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; CSE-NEXT: [[IV2_PLUS_1]] = add i64 [[IV2]], 1
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; CSE-NEXT: br label [[BB214]]
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;
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bb:
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%inv4 = add nuw nsw i64 %inv1, %inv2
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%inv5 = add nuw nsw i64 %inv2, %inv3
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br label %bb214
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bb214: ; preds = %bb214, %bb
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%iv1 = phi i64 [ %iv2, %bb214 ], [ 0, %bb ]
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%iv2 = phi i64 [ %iv2_plus_1, %bb214 ], [ 1, %bb ]
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%loop_dependent = shl nuw nsw i64 %iv1, 13
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%loop_dependent2 = add nsw i64 %inv4, %loop_dependent
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call void @keep_alive(i64 %loop_dependent2)
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%loop_dependent3 = add i64 %inv5, %loop_dependent
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call void @keep_alive(i64 %loop_dependent3)
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%iv2_plus_1 = add i64 %iv2, 1
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br label %bb214
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}
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declare void @keep_alive(i64)
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