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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
45 lines
1.5 KiB
LLVM
45 lines
1.5 KiB
LLVM
; RUN: opt -basicaa -newgvn -S < %s | FileCheck %s
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target datalayout = "e-m:x-p:32:32-i64:64-f80:32-n8:16:32-a:0:32-S32"
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target triple = "i686-pc-windows-msvc"
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%eh.ThrowInfo = type { i32, i8*, i8*, i8* }
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%struct.A = type { i32* }
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@"_TI1?AUA@@" = external constant %eh.ThrowInfo
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define i8 @f() personality i32 (...)* @__CxxFrameHandler3 {
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entry:
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%b = alloca i8
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%c = alloca i8
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store i8 42, i8* %b
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store i8 13, i8* %c
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invoke void @_CxxThrowException(i8* %b, %eh.ThrowInfo* nonnull @"_TI1?AUA@@")
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to label %unreachable unwind label %catch.dispatch
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catch.dispatch: ; preds = %entry
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%cs1 = catchswitch within none [label %catch] unwind to caller
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catch: ; preds = %catch.dispatch
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%catchpad = catchpad within %cs1 [i8* null, i32 64, i8* null]
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store i8 5, i8* %b
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catchret from %catchpad to label %try.cont
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try.cont: ; preds = %catch
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%load_b = load i8, i8* %b
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%load_c = load i8, i8* %c
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%add = add i8 %load_b, %load_c
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ret i8 %add
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unreachable: ; preds = %entry
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unreachable
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}
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; CHECK-LABEL: define i8 @f(
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; CHECK: %[[load_b:.*]] = load i8, i8* %b
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; CHECK-NEXT: %[[load_c:.*]] = load i8, i8* %c
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; CHECK-NEXT: %[[add:.*]] = add i8 %[[load_b]], %[[load_c]]
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; CHECK-NEXT: ret i8 %[[add]]
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declare i32 @__CxxFrameHandler3(...)
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declare x86_stdcallcc void @_CxxThrowException(i8*, %eh.ThrowInfo*)
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