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Change getelementptr folding to use APInt instead of uint64_t for

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offset computations. This fixes a truncation bug on targets that
don't have 64-bit pointers.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@79639 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman
2009-08-21 16:52:54 +00:00
parent 3b83287c4e
commit cda9706cb7
2 changed files with 34 additions and 14 deletions
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test/Transforms/InstCombine/constant-fold-gep-overindex.ll
+19 -3
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@@ -1,17 +1,33 @@
; RUN: llvm-as < %s | opt -instcombine
; RUN: llvm-as < %s | opt -instcombine | llvm-dis | FileCheck %s
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"
target triple = "i386-apple-darwin10.0"
%0 = type { i8*, [19 x i8] }
%1 = type { i8*, [0 x i8] }
@array = external global [11 x i8]
@s = external global %0 ; <%0*> [#uses=1]
@"\01LC8" = external constant [17 x i8] ; <[17 x i8]*> [#uses=1]
; Instcombine should be able to fold this getelementptr.
define i32 @main() nounwind {
entry:
%0 = call i32 (i8*, ...)* @printf(i8* getelementptr ([17 x i8]* @"\01LC8", i32 0, i32 0), i8* undef, i8* getelementptr (%1* bitcast (%0* @s to %1*), i32 0, i32 1, i32 0)) nounwind ; <i32> [#uses=0]
; CHECK: call i32 (i8*, ...)* @printf(i8* getelementptr inbounds ([17 x i8]* @"\01LC8", i32 0, i32 0), i8* undef, i8* bitcast (i8** getelementptr (%1* bitcast (%0* @s to %1*), i32 1, i32 0) to i8*)) nounwind
call i32 (i8*, ...)* @printf(i8* getelementptr ([17 x i8]* @"\01LC8", i32 0, i32 0), i8* undef, i8* getelementptr (%1* bitcast (%0* @s to %1*), i32 0, i32 1, i32 0)) nounwind ; <i32> [#uses=0]
ret i32 0
}
; Instcombine should constant-fold the GEP so that indices that have
; static array extents are within bounds of those array extents.
; In the below, -1 is not in the range [0,11). After the transformation,
; the same address is computed, but 3 is in the range of [0,11).
define i8* @foo() nounwind {
; CHECK: ret i8* getelementptr ([11 x i8]* @array, i32 390451572, i32 3)
ret i8* getelementptr ([11 x i8]* @array, i32 0, i64 -1)
}
declare i32 @printf(i8*, ...) nounwind