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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
49 lines
1.6 KiB
LLVM
49 lines
1.6 KiB
LLVM
; XFAIL: *
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; RUN: opt < %s -basicaa -newgvn -S | FileCheck %s
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; GVN should eliminate the fully redundant %9 GEP which
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; allows DEAD to be removed. This is PR3198.
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; The %7 and %4 loads combine to make %DEAD unneeded.
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target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128"
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target triple = "i386-apple-darwin7"
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@H = common global [100 x i32] zeroinitializer, align 32 ; <[100 x i32]*> [#uses=3]
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@G = common global i32 0 ; <i32*> [#uses=2]
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define i32 @test(i32 %i) nounwind {
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entry:
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%0 = tail call i32 (...) @foo() nounwind ; <i32> [#uses=1]
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%1 = icmp eq i32 %0, 0 ; <i1> [#uses=1]
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br i1 %1, label %bb1, label %bb
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bb: ; preds = %entry
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%2 = tail call i32 (...) @bar() nounwind ; <i32> [#uses=0]
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%3 = getelementptr [100 x i32], [100 x i32]* @H, i32 0, i32 %i ; <i32*> [#uses=1]
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%4 = load i32, i32* %3, align 4 ; <i32> [#uses=1]
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store i32 %4, i32* @G, align 4
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br label %bb3
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bb1: ; preds = %entry
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%5 = tail call i32 (...) @baz() nounwind ; <i32> [#uses=0]
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%6 = getelementptr [100 x i32], [100 x i32]* @H, i32 0, i32 %i ; <i32*> [#uses=1]
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%7 = load i32, i32* %6, align 4 ; <i32> [#uses=2]
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store i32 %7, i32* @G, align 4
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%8 = icmp eq i32 %7, 0 ; <i1> [#uses=1]
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br i1 %8, label %bb3, label %bb4
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bb3: ; preds = %bb1, %bb
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%9 = getelementptr [100 x i32], [100 x i32]* @H, i32 0, i32 %i ; <i32*> [#uses=1]
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%DEAD = load i32, i32* %9, align 4 ; <i32> [#uses=1]
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; CHECK: %DEAD = phi i32 [ 0, %bb1 ], [ %4, %bb ]
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ret i32 %DEAD
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bb4: ; preds = %bb1
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ret i32 0
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}
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declare i32 @foo(...)
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declare i32 @bar(...)
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declare i32 @baz(...)
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