Andrea Di Biagio 56f90d72c8 [InstCombine] Teach the udiv folding logic how to handle constant expressions. ...

This patch fixes PR30366.

Function foldUDivShl() worked under the assumption that one of the values
in input to the function was always an instance of llvm::Instruction.
However, function visitUDivOperand() (the only user of foldUDivShl) was
clearly violating that precondition; internally, visitUDivOperand() uses pattern
matches to check the operands of a udiv. Pattern matchers for binary operators
know how to handle both Instruction and ConstantExpr values.

This patch fixes the problem in foldUDivShl(). Now we use pattern matchers
instead of explicit casts to Instruction. The reduced test case from PR30366
has been added to test file InstCombine/udiv-simplify.ll.

Differential Revision: https://reviews.llvm.org/D24565


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@282398 91177308-0d34-0410-b5e6-96231b3b80d8

2016-09-26 12:07:23 +00:00

..

CMakeLists.txt

Use ADDITIONAL_HEADER_DIRS in all LLVM CMake projects.

2015-02-11 03:28:02 +00:00

InstCombineAddSub.cpp

InstCombine: Replace some never-null pointers with references. NFC

2016-08-05 01:06:44 +00:00

InstCombineAndOrXor.cpp

[InstCombine] add helper function for folding {and,or,xor} (cast X), C ; NFCI

2016-09-12 00:16:23 +00:00

InstCombineCalls.cpp

[InstCombine][SSE4a] Fix assertion failure in the insertq/insertqi combining logic.

2016-09-07 12:47:53 +00:00

InstCombineCasts.cpp

Reapply "InstCombine: Reduce trunc (shl x, K) width."

2016-09-13 19:43:57 +00:00

InstCombineCompares.cpp

[InstCombine] add helper functions for visitICmpInst(); NFCI

2016-09-16 16:10:22 +00:00

InstCombineInternal.h

[InstCombine] add helper functions for visitICmpInst(); NFCI

2016-09-16 16:10:22 +00:00

InstCombineLoadStoreAlloca.cpp

InstCombine: Don't combine loads/stores from swifterror to a new type

2016-09-10 18:14:57 +00:00

InstCombineMulDivRem.cpp

[InstCombine] Teach the udiv folding logic how to handle constant expressions.

2016-09-26 12:07:23 +00:00

InstCombinePHI.cpp

Use the range variant of find/find_if instead of unpacking begin/end

2016-08-12 03:55:06 +00:00

InstCombineSelect.cpp

[InstCombine] canonicalize vector select with constant vector condition to shuffle

2016-09-16 22:16:18 +00:00

InstCombineShifts.cpp

Replace a few more "fall through" comments with LLVM_FALLTHROUGH

2016-08-17 20:30:52 +00:00

InstCombineSimplifyDemanded.cpp

[InstCombine] Fix for PR29124: reduce insertelements to shufflevector

2016-09-23 09:14:08 +00:00

InstCombineVectorOps.cpp

[InstCombine] Fix for PR29124: reduce insertelements to shufflevector

2016-09-23 09:14:08 +00:00

InstructionCombining.cpp

[InstCombine] allow vector types for constant folding / computeKnownBits (PR24942)

2016-09-16 21:20:36 +00:00

LLVMBuild.txt

Update libdeps since TLI was moved from Target to Analysis in r226078.

2015-01-15 05:21:00 +00:00