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c22a4eeec6
llvm-6502/test
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David Majnemer c22a4eeec6 InstCombine: FoldGEPICmp shouldn't change sign of base pointer comparison 
Changing the sign when comparing the base pointer would introduce all
sorts of unexpected things like:
  %gep.i = getelementptr inbounds [1 x i8]* %a, i32 0, i32 0
  %gep2.i = getelementptr inbounds [1 x i8]* %b, i32 0, i32 0
  %cmp.i = icmp ult i8* %gep.i, %gep2.i
  %cmp.i1 = icmp ult [1 x i8]* %a, %b
  %cmp = icmp ne i1 %cmp.i, %cmp.i1
  ret i1 %cmp

into:
  %cmp.i = icmp slt [1 x i8]* %a, %b
  %cmp.i1 = icmp ult [1 x i8]* %a, %b
  %cmp = xor i1 %cmp.i, %cmp.i1
  ret i1 %cmp

By preserving the original sign, we now get:
  ret i1 false

This fixes PR16483.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@185259 91177308-0d34-0410-b5e6-96231b3b80d8
2013-06-29 10:28:04 +00:00
..
Analysis Minimize precision loss when computing cyclic probabilities. 2013-06-28 22:40:43 +00:00
Archive Fix an ordering problem in the test. 2013-06-21 07:23:14 +00:00
Assembler Added support for the Builtin attribute. 2013-06-27 00:25:01 +00:00
Bindings/Ocaml
Bitcode
BugPoint
CodeGen PPC: Ignore spill/restore requests for VRSAVE (except on Darwin) 2013-06-28 22:29:56 +00:00
DebugInfo DebugInfo: PR14728: TLS support 2013-06-28 20:05:11 +00:00
ExecutionEngine Enable mcjit tests on ppc64 when building with cmake. 2013-06-03 19:17:21 +00:00
Feature
FileCheck
Instrumentation [asan] workaround for PR16277: don't instrument AllocaInstr with alignment more than the redzone size 2013-06-26 09:49:52 +00:00
Integer
JitListener
Linker
MC ARM: Fix pseudo-instructions for SRS (Store Return State). 2013-06-28 15:09:46 +00:00
Object [yaml2obj][ELF] Make symbol table top-level key. 2013-06-22 01:38:00 +00:00
Other Suppress llvm/test/Other/can-execute.txt on msys bash. 2013-06-26 10:56:44 +00:00
TableGen
tools readobj: Dump PE/COFF optional records. 2013-06-12 19:10:33 +00:00
Transforms InstCombine: FoldGEPICmp shouldn't change sign of base pointer comparison 2013-06-29 10:28:04 +00:00
Unit
Verifier
YAMLParser
CMakeLists.txt
lit.cfg Suppress llvm/test/Other/can-execute.txt on msys bash. 2013-06-26 10:56:44 +00:00
lit.site.cfg.in
Makefile
Makefile.tests
TestRunner.sh