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ea0ea63773
llvm-6502/lib
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Serge Pavlov ea0ea63773 Recognize test for overflow in integer multiplication. 
If multiplication involves zero-extended arguments and the result is
compared as in the patterns:

    %mul32 = trunc i64 %mul64 to i32
    %zext = zext i32 %mul32 to i64
    %overflow = icmp ne i64 %mul64, %zext
or
    %overflow = icmp ugt i64 %mul64 , 0xffffffff

then the multiplication may be replaced by call to umul.with.overflow.
This change fixes PR4917 and PR4918.

Differential Revision: http://llvm-reviews.chandlerc.com/D2814


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@206137 91177308-0d34-0410-b5e6-96231b3b80d8
2014-04-13 18:23:41 +00:00
..
Analysis blockfreq: Rename BlockFrequencyImpl to BlockFrequencyInfoImpl 2014-04-11 23:20:58 +00:00
AsmParser AsmParser: add a warning for compatibility parsing 2014-04-05 22:42:53 +00:00
Bitcode All new elements except the last one initialized to NULL. Ideally, once parsing is complete, all elements should be non-NULL. 2014-03-27 12:08:23 +00:00
CodeGen Retire llvm::array_endof in favor of non-member std::end. 2014-04-12 16:15:53 +00:00
DebugInfo Simplify compression API by decompressing into a SmallVector rather than a MemoryBuffer 2014-04-05 21:26:44 +00:00
ExecutionEngine LLVMBuild.txt: Add missing dependencies. 2014-04-10 11:16:47 +00:00
IR Retire llvm::array_endof in favor of non-member std::end. 2014-04-12 16:15:53 +00:00
IRReader Replace OwningPtr<T> with std::unique_ptr<T>. 2014-03-06 05:51:42 +00:00
LineEditor [CMake] Use LINK_LIBS instead of target_link_libraries(). 2014-02-26 06:41:29 +00:00
Linker [Layering] Sink Linker.h into a Linker subdirectory to make it 2014-03-06 03:42:23 +00:00
LTO Move the segmented stack switch to a function attribute 2014-04-10 22:58:43 +00:00
MC [C++11] More 'nullptr' conversion or in some cases just using a boolean check instead of comparing to nullptr. 2014-04-13 04:57:38 +00:00
Object [yaml2obj][ELF] ELF Relocations Support. 2014-04-11 04:13:39 +00:00
Option Avoid buffer copies when a Twine already is a StringRef. 2013-12-03 18:18:28 +00:00
ProfileData InstrProf: Silence spurious warnings in GCC 4.8 2014-03-24 00:47:18 +00:00
Support Retire llvm::array_endof in favor of non-member std::end. 2014-04-12 16:15:53 +00:00
TableGen [C++11] Make use of 'nullptr' in TableGen library. 2014-04-09 04:50:04 +00:00
Target [PowerPC] Fix rlwimi isel when mask is not constant 2014-04-13 17:10:58 +00:00
Transforms Recognize test for overflow in integer multiplication. 2014-04-13 18:23:41 +00:00
CMakeLists.txt ProfileData: Introduce the InstrProfReader interface and a text reader 2014-03-21 17:24:48 +00:00
LLVMBuild.txt ProfileData: Introduce the InstrProfReader interface and a text reader 2014-03-21 17:24:48 +00:00
Makefile ProfileData: Introduce the InstrProfReader interface and a text reader 2014-03-21 17:24:48 +00:00