llvm-6502/test/Assembler/ConstantExprFold.llx
Chris Lattner f286f6fd93 Fix PR1850 by removing an unsafe transformation from VMCore/ConstantFold.cpp.
Reimplement the xform in Analysis/ConstantFolding.cpp where we can use
targetdata to validate that it is safe.  While I'm in there, fix some const
correctness issues and generalize the interface to the "operand folder".


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@44817 91177308-0d34-0410-b5e6-96231b3b80d8
2007-12-10 22:53:04 +00:00

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; This test checks to make sure that constant exprs fold in some simple
; situations
; RUN: llvm-upgrade < %s | llvm-as | llvm-dis | not grep {(}
%A = global long 0
global long* cast (long add (long cast (long* %A to long), long 0) to long*) ; X + 0 == X
global long* cast (long sub (long cast (long* %A to long), long 0) to long*) ; X - 0 == X
global long* cast (long mul (long cast (long* %A to long), long 0) to long*) ; X * 0 == 0
global long* cast (long div (long cast (long* %A to long), long 1) to long*) ; X / 1 == X
global long* cast (long rem (long cast (long* %A to long), long 1) to long*) ; X % 1 == 0
global long* cast (long and (long cast (long* %A to long), long 0) to long*) ; X & 0 == 0
global long* cast (long and (long cast (long* %A to long), long -1) to long*) ; X & -1 == X
global long or (long cast (long* %A to long), long -1) ; X | -1 == -1
global long* cast (long xor (long cast (long* %A to long), long 0) to long*) ; X ^ 0 == X
%Ty = type { int, int }
%B = external global %Ty
global bool setlt (long* %A, long* getelementptr (long* %A, long 1)) ; true
global bool setlt (long* %A, long* getelementptr (long* %A, long 0)) ; false
global bool setlt (int* getelementptr (%Ty* %B, long 0, uint 0),
int* getelementptr (%Ty* %B, long 0, uint 1)) ; true
;global bool setne (long* %A, long* cast (%Ty* %B to long*)) ; true