David Majnemer 505187a9bd InstCombine: Don't miscompile X % ((Pow2 << A) >>u B) ...

We assumed that A must be greater than B because the right hand side of
a remainder operator must be nonzero.

However, it is possible for A to be less than B if Pow2 is a power of
two greater than 1.

Take for example:
i32 %A = 0
i32 %B = 31
i32 Pow2 = 2147483648

((Pow2 << 0) >>u 31) is non-zero but A is less than B.

This fixes PR21274.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@219713 91177308-0d34-0410-b5e6-96231b3b80d8

2014-10-14 20:28:40 +00:00

..

Analysis

[LVI] Check for @llvm.assume dominating the edge branch

2014-10-14 16:04:49 +00:00

AsmParser

Make CallingConv::ID an alias of "unsigned".

2014-09-10 18:00:17 +00:00

Bitcode

Introduce LLVMWriteBitcodeToMemoryBuffer C API function.

2014-10-14 00:30:59 +00:00

CodeGen

Remove unused member variable.

2014-10-14 18:53:16 +00:00

DebugInfo

Add couple of missing 'override' keyword. NFC.

2014-10-10 17:34:30 +00:00

ExecutionEngine

[MCJIT] Replace memcpy with readBytesUnaligned in RuntimeDyldMachOI386.

2014-10-10 23:07:09 +00:00

IR

DebugInfo: Ensure that all debug location scope chains from instructions within a function, lead to the function itself.

2014-10-14 18:22:52 +00:00

IRReader

Pass a && to getLazyBitcodeModule.

2014-09-03 17:31:46 +00:00

LineEditor

…

Linker

Merge alignment of common GlobalValue.

2014-09-09 17:48:18 +00:00

LTO

LTO: Document the Boolean argument from r218784

2014-10-02 21:11:04 +00:00

MC

Remove method that is identical to the base class one.

2014-10-14 17:38:38 +00:00

Object

Object, COFF: Move the VirtualSize/SizeOfRawData logic to getSectionSize

2014-10-09 08:42:31 +00:00

Option

Add an overload of getLastArgNoClaim taking two OptSpecifiers.

2014-09-12 19:42:53 +00:00

ProfileData

Reduce double set lookups. NFC.

2014-10-10 15:32:50 +00:00

Support

Revert "r216914 - Revert: [APFloat] Fixed a bug in method 'fusedMultiplyAdd'"

2014-10-14 19:23:07 +00:00

TableGen

Eliminate some deep std::vector copies. NFC.

2014-10-03 18:33:16 +00:00

Target

Reapply "R600: Add new intrinsic to read work dimensions"

2014-10-14 20:05:26 +00:00

Transforms

InstCombine: Don't miscompile X % ((Pow2 << A) >>u B)

2014-10-14 20:28:40 +00:00

CMakeLists.txt

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LLVMBuild.txt

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Makefile

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