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bd0298b1e1
The code have been developed by Daniel Berlin over the years, and the new implementation goal is that of addressing shortcomings of the current GVN infrastructure, i.e. long compile time for large testcases, lack of phi predication, no load/store value numbering etc... The current code just implements the "core" GVN algorithm, although other pieces (load coercion, phi handling, predicate system) are already implemented in a branch out of tree. Once the core is stable, we'll start adding pieces on top of the base framework. The test currently living in test/Transform/NewGVN are a copy of the ones in GVN, with proper `XFAIL` (missing features in NewGVN). A flag will be added in a future commit to enable NewGVN, so that interested parties can exercise this code easily. Differential Revision: https://reviews.llvm.org/D26224 llvm-svn: 290346
51 lines
1.8 KiB
LLVM
51 lines
1.8 KiB
LLVM
; RUN: opt -loops -newgvn -S < %s | FileCheck %s
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; This used to fail with ASAN enabled and if for some reason LoopInfo remained
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; available during GVN. In this case BasicAA will use LI but
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; MergeBlockIntoPredecessor in GVN failed to update LI.
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target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
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%struct.wibble.1028 = type { i32, i32, %struct.barney.881 }
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%struct.barney.881 = type { %struct.zot.882 }
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%struct.zot.882 = type { [64 x i8] }
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; Function Attrs: argmemonly
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declare void @snork.1(i8*) local_unnamed_addr #0
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define hidden zeroext i1 @eggs(%struct.wibble.1028* %arg, i1 %arg2) unnamed_addr align 2 {
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bb:
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br i1 %arg2, label %bb14, label %bb3
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bb3: ; preds = %bb
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%tmp = getelementptr inbounds %struct.wibble.1028, %struct.wibble.1028* %arg, i64 0, i32 2, i32 0, i32 0, i64 0
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%tmp5 = bitcast i8* %tmp to %struct.wibble.1028**
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br label %bb6
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bb6: ; preds = %bb12, %bb3
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br label %bb7
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bb7: ; preds = %bb6
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br i1 undef, label %bb11, label %bb8
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bb8: ; preds = %bb7
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%tmp9 = load %struct.wibble.1028*, %struct.wibble.1028** %tmp5, align 8
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; CHECK: %tmp9 = load %struct.wibble.1028*, %struct.wibble.1028** %tmp5, align 8
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%tmp10 = bitcast %struct.wibble.1028* %tmp9 to i8*
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br label %bb12
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bb11: ; preds = %bb7
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br label %bb12
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bb12: ; preds = %bb11, %bb8
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%tmp13 = phi i8* [ %tmp, %bb11 ], [ %tmp10, %bb8 ]
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call void @snork.1(i8* %tmp13) #1
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br label %bb6
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bb14: ; preds = %bb
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ret i1 false
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}
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attributes #0 = { argmemonly }
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attributes #1 = { nounwind }
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