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Improve isSafeToLoadUnconditionally to recognize that GEPs with constant

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indices are safe if the result is known to be within the bounds of the
underlying object.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@94829 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bob Wilson
2010-01-29 19:19:08 +00:00
parent 01eba39793
commit 3eb4f7e2dd
6 changed files with 83 additions and 22 deletions
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16
test/Transforms/InstCombine/load-select.ll Normal file
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@@ -0,0 +1,16 @@
; RUN: opt < %s -instcombine -S | FileCheck %s
target datalayout = "e-p:32:32:32-i1:8:32-i8:8:32-i16:16:32-i32:32:32-i64:32:32-f32:32:32-f64:32:32-v64:64:64-v128:128:128-a0:0:32-n32"
@a = constant [2 x i32] [i32 3, i32 6] ; <[2 x i32]*> [#uses=2]
define arm_apcscc i32 @b(i32 %y) nounwind readonly {
; CHECK: @b
; CHECK-NOT: load
; CHECK: ret i32
entry:
%0 = icmp eq i32 %y, 0 ; <i1> [#uses=1]
%storemerge = select i1 %0, i32* getelementptr inbounds ([2 x i32]* @a, i32 0, i32 1), i32* getelementptr inbounds ([2 x i32]* @a, i32 0, i32 0) ; <i32*> [#uses=1]
%1 = load i32* %storemerge, align 4 ; <i32> [#uses=1]
ret i32 %1
}