Evan Cheng bbbe413846 Remove a instcombine transform that (no longer?) makes sense: ... // C - zext(bool) -> bool ? C - 1 : C if (ZExtInst *ZI = dyn_cast<ZExtInst>(Op1)) if (ZI->getSrcTy()->isIntegerTy(1)) return SelectInst::Create(ZI->getOperand(0), SubOne(C), C); This ends up forming sext i1 instructions that codegen to terrible code. e.g. int blah(_Bool x, _Bool y) { return (x - y) + 1; } => movzbl %dil, %eax movzbl %sil, %ecx shll $31, %ecx sarl $31, %ecx leal 1(%rax,%rcx), %eax ret Without the rule, llvm now generates: movzbl %sil, %ecx movzbl %dil, %eax incl %eax subl %ecx, %eax ret It also helps with ARM (and pretty much any target that doesn't have a sext i1 :-). The transformation was done as part of Eli's r75531. He has given the ok to remove it. rdar://11748024 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@159230 91177308-0d34-0410-b5e6-96231b3b80d8		2012-06-26 22:03:13 +00:00
..
CMakeLists.txt	llvm/lib: [CMake] Add explicit dependency to intrinsics_gen.	2012-06-24 13:32:01 +00:00
InstCombine.h	add a new pass to instrument loads and stores for run-time bounds checking	2012-05-22 17:19:09 +00:00
InstCombineAddSub.cpp	Remove a instcombine transform that (no longer?) makes sense:	2012-06-26 22:03:13 +00:00
InstCombineAndOrXor.cpp	InstCombine: fix a bug when combining (fcmp cc0 x, y) && (fcmp cc1 x, y).	2012-06-14 05:57:42 +00:00
InstCombineCalls.cpp	instcombine: disable optimization of 'invoke null/undef'. I'll move this functionality to SimplifyCFG (since we cannot make changes to the CFG here).	2012-06-21 23:52:14 +00:00
InstCombineCasts.cpp	Revert remaining part of r93200: "Disable folding sext(trunc(x)) -> x"	2012-06-22 16:36:43 +00:00
InstCombineCompares.cpp	InstCombine: factor code better.	2012-06-11 08:01:25 +00:00
InstCombineLoadStoreAlloca.cpp	Replacing zero-sized alloca's with a null pointer is too aggressive, instead	2012-06-26 13:39:21 +00:00
InstCombineMulDivRem.cpp	Look pass zext to strength reduce an udiv. Patch by David Majnemer. rdar://11721329	2012-06-21 22:52:49 +00:00
InstCombinePHI.cpp	Update instcombine for atomic load/store.	2011-08-15 22:09:40 +00:00
InstCombineSelect.cpp	Fix a bug in FoldSelectOpOp. Bitcast ops may change the number of vector elements, which may disagree with the select condition type.	2012-06-07 20:28:57 +00:00
InstCombineShifts.cpp	PR12967: Don't crash when trying to fold a shift that's larger than the type's size.	2012-05-27 22:03:32 +00:00
InstCombineSimplifyDemanded.cpp	Always compute all the bits in ComputeMaskedBits.	2012-04-04 12:51:34 +00:00
InstCombineVectorOps.cpp	continue making the world safe for ConstantDataVector. At this point,	2012-01-27 03:08:05 +00:00
InstCombineWorklist.h	Use an iterator instead of calling .size() on the worklist every time, which is wasteful.	2012-03-15 11:19:41 +00:00
InstructionCombining.cpp	improve optimization of invoke instructions:	2012-06-25 17:11:47 +00:00
LLVMBuild.txt	LLVMBuild: Remove trailing newline, which irked me.	2011-12-12 19:48:00 +00:00
Makefile	make -fno-rtti the default unless a directory builds with REQUIRES_RTTI.	2010-01-24 20:43:08 +00:00