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Add a testcase for PR2831.

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llvm-svn: 76527
This commit is contained in:
Dan Gohman 2009-07-21 01:02:18 +00:00
parent 7a836d6400
commit f2c6e6a1bd
1 changed files with 35 additions and 0 deletions
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test/Transforms/InstCombine/cast3.ll Normal file
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; RUN: llvm-as < %s | opt -instcombine | llvm-dis | not grep getelementptr
; PR2831
; Don't raise arbitrary inttoptr+arithmetic+ptrtoint to getelementptr.
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-f80:32:32"
define i32 @main(i32 %argc, i8** %argv) nounwind {
entry:
%0 = ptrtoint i8** %argv to i32 ; <i32> [#uses=1]
%1 = add i32 %0, 1 ; <i32> [#uses=1]
ret i32 %1
}
; This testcase could theoretically be optimized down to return zero,
; but for now being conservative with ptrtoint/inttoptr is fine.
define i32 @a() nounwind {
entry:
%b = alloca i32 ; <i32*> [#uses=3]
%a = alloca i32 ; <i32*> [#uses=2]
%"alloca point" = bitcast i32 0 to i32 ; <i32> [#uses=0]
store i32 1, i32* %b, align 4
%a1 = ptrtoint i32* %a to i32 ; <i32> [#uses=1]
%b4 = ptrtoint i32* %b to i32 ; <i32> [#uses=1]
%a7 = ptrtoint i32* %a to i32 ; <i32> [#uses=1]
%0 = sub i32 %b4, %a7 ; <i32> [#uses=1]
%1 = add i32 %a1, %0 ; <i32> [#uses=1]
%2 = inttoptr i32 %1 to i32* ; <i32*> [#uses=1]
store i32 0, i32* %2, align 4
%3 = load i32* %b, align 4 ; <i32> [#uses=1]
br label %return
return: ; preds = %entry
ret i32 %3
}