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path: root/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
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2006-03-13add a couple of missing foldsChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26724 91177308-0d34-0410-b5e6-96231b3b80d8
2006-03-05Reinstate this now that the offending opposite xform has been removed.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26548 91177308-0d34-0410-b5e6-96231b3b80d8
2006-03-05Back out fold (shl (add x, c1), c2) -> (add (shl x, c2), c1<<c2) for now.Evan Cheng
It's causing an infinite loop compiling ldecod on x86 / Darwin. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26544 91177308-0d34-0410-b5e6-96231b3b80d8
2006-03-05Add some simple copysign foldsChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26543 91177308-0d34-0410-b5e6-96231b3b80d8
2006-03-04fold (mul (add x, c1), c2) -> (add (mul x, c2), c1*c2)Chris Lattner
fold (shl (add x, c1), c2) -> (add (shl x, c2), c1<<c2) This allows us to compile CodeGen/PowerPC/addi-reassoc.ll into: _test1: slwi r2, r4, 4 add r2, r2, r3 lwz r3, 36(r2) blr _test2: mulli r2, r4, 5 add r2, r2, r3 lbz r2, 11(r2) extsb r3, r2 blr instead of: _test1: addi r2, r4, 2 slwi r2, r2, 4 add r2, r3, r2 lwz r3, 4(r2) blr _test2: addi r2, r4, 2 mulli r2, r2, 5 add r2, r3, r2 lbz r2, 1(r2) extsb r3, r2 blr git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26535 91177308-0d34-0410-b5e6-96231b3b80d8
2006-03-01Fix CodeGen/Generic/2006-03-01-dagcombineinfloop.ll, an infinite loopChris Lattner
in the dag combiner on 176.gcc on x86. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26459 91177308-0d34-0410-b5e6-96231b3b80d8
2006-03-01Fix a typo evan noticedChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26454 91177308-0d34-0410-b5e6-96231b3b80d8
2006-03-01Add support for target-specific dag combinesChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26443 91177308-0d34-0410-b5e6-96231b3b80d8
2006-03-01Add a new AddToWorkList method, start using itChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26441 91177308-0d34-0410-b5e6-96231b3b80d8
2006-03-01Pull shifts by a constant through multiplies (a form of reassociation),Chris Lattner
implementing Regression/CodeGen/X86/mul-shift-reassoc.ll git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26440 91177308-0d34-0410-b5e6-96231b3b80d8
2006-03-01Vector ops lowering.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26436 91177308-0d34-0410-b5e6-96231b3b80d8
2006-02-28Compile:Chris Lattner
unsigned foo4(unsigned short *P) { return *P & 255; } unsigned foo5(short *P) { return *P & 255; } to: _foo4: lbz r3,1(r3) blr _foo5: lbz r3,1(r3) blr not: _foo4: lhz r2, 0(r3) rlwinm r3, r2, 0, 24, 31 blr _foo5: lhz r2, 0(r3) rlwinm r3, r2, 0, 24, 31 blr git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26419 91177308-0d34-0410-b5e6-96231b3b80d8
2006-02-28Fold "and (LOAD P), 255" -> zextload. This allows us to compile:Chris Lattner
unsigned foo3(unsigned *P) { return *P & 255; } as: _foo3: lbz r3, 3(r3) blr instead of: _foo3: lwz r2, 0(r3) rlwinm r3, r2, 0, 24, 31 blr and: unsigned short foo2(float a) { return a; } as: _foo2: fctiwz f0, f1 stfd f0, -8(r1) lhz r3, -2(r1) blr instead of: _foo2: fctiwz f0, f1 stfd f0, -8(r1) lwz r2, -4(r1) rlwinm r3, r2, 0, 16, 31 blr git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26417 91177308-0d34-0410-b5e6-96231b3b80d8
2006-02-28fold (sra (sra x, c1), c2) -> (sra x, c1+c2)Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26416 91177308-0d34-0410-b5e6-96231b3b80d8
2006-02-27remove some completed notesChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26390 91177308-0d34-0410-b5e6-96231b3b80d8
2006-02-20Fix a problem Nate and Duraid reported where simplifying nodes can causeChris Lattner
them to get ressurected, in which case, deleting the undead nodes is unfriendly. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26291 91177308-0d34-0410-b5e6-96231b3b80d8
2006-02-18Add checks to make sure we don't create bogus extend nodes, and fix a bugNate Begeman
where we were doing exactly that which was causing failures on x86 and alpha. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26284 91177308-0d34-0410-b5e6-96231b3b80d8
2006-02-17Fix a tricky issue in the SimplifyDemandedBits code where CombineTo wasn'tChris Lattner
exactly the API we wanted to call into. This fixes the crash on crafty last night. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26269 91177308-0d34-0410-b5e6-96231b3b80d8
2006-02-17Clean up DemandedBitsAreZero interfaceNate Begeman
Make more use of the new mask helpers in valuetypes.h Combine (sra (srl x, c1), c1) -> sext_inreg if legal git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26263 91177308-0d34-0410-b5e6-96231b3b80d8
2006-02-17Don't expand sdiv by power of two before legalize, since it will likelyNate Begeman
generate illegal nodes. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26261 91177308-0d34-0410-b5e6-96231b3b80d8
2006-02-17kill ADD_PARTS & SUB_PARTS and replace them with fancy new ADDC, ADDE, SUBCNate Begeman
and SUBE nodes that actually expose what's going on and allow for significant simplifications in the targets. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26255 91177308-0d34-0410-b5e6-96231b3b80d8
2006-02-16Rework the SelectionDAG-based implementations of SimplifyDemandedBitsNate Begeman
and ComputeMaskedBits to match the new improved versions in instcombine. Tested against all of multisource/benchmarks on ppc. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26238 91177308-0d34-0410-b5e6-96231b3b80d8
2006-02-16Lowering of sdiv X, pow2 was broken, this fixes it. This patch is writtenChris Lattner
by Nate, I'm just committing it for him. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26230 91177308-0d34-0410-b5e6-96231b3b80d8
2006-02-15Should not combine ISD::LOCATIONs until we have scheme to remove fromJim Laskey
MachineDebugInfo tables. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26216 91177308-0d34-0410-b5e6-96231b3b80d8
2006-02-08Compile this:Chris Lattner
xori r6, r2, 1 rlwinm r6, r6, 0, 31, 31 cmpwi cr0, r6, 0 bne cr0, LBB1_3 ; endif to this: rlwinm r6, r2, 0, 31, 31 cmpwi cr0, r6, 0 beq cr0, LBB1_3 ; endif git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26047 91177308-0d34-0410-b5e6-96231b3b80d8
2006-02-05Back out previous commit, it isn't safe.Nate Begeman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26006 91177308-0d34-0410-b5e6-96231b3b80d8
2006-02-05fold c1 << (x + c2) into (c1 << c2) << x. fix a warning.Nate Begeman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26005 91177308-0d34-0410-b5e6-96231b3b80d8
2006-02-05Handle urem by shifted powers of 2.Nate Begeman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26001 91177308-0d34-0410-b5e6-96231b3b80d8
2006-02-05handle combining A / (B << N) into A >>u (log2(B)+N) when B is a power of 2Nate Begeman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26000 91177308-0d34-0410-b5e6-96231b3b80d8
2006-02-03Add a framework for eliminating instructions that produces undemanded bits.Nate Begeman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@25945 91177308-0d34-0410-b5e6-96231b3b80d8
2006-02-03Add common code for reassociating ops in the dag combinerNate Begeman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@25934 91177308-0d34-0410-b5e6-96231b3b80d8
2006-02-02Turn any_extend nodes into zero_extend nodes when it allows us to remove anChris Lattner
and instruction. This allows us to compile stuff like this: bool %X(int %X) { %Y = add int %X, 14 %Z = setne int %Y, 12345 ret bool %Z } to this: _X: cmpl $12331, 4(%esp) setne %al movzbl %al, %eax ret instead of this: _X: cmpl $12331, 4(%esp) setne %al movzbl %al, %eax andl $1, %eax ret This occurs quite a bit with the X86 backend. For example, 25 times in lambda, 30 times in 177.mesa, 14 times in galgel, 70 times in fma3d, 25 times in vpr, several hundred times in gcc, ~45 times in crafty, ~60 times in parser, ~140 times in eon, 110 times in perlbmk, 55 on gap, 16 times on bzip2, 14 times on twolf, and 1-2 times in many other SPEC2K programs. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@25901 91177308-0d34-0410-b5e6-96231b3b80d8
2006-02-02add two dag combines:Chris Lattner
(C1-X) == C2 --> X == C1-C2 (X+C1) == C2 --> X == C2-C1 This allows us to compile this: bool %X(int %X) { %Y = add int %X, 14 %Z = setne int %Y, 12345 ret bool %Z } into this: _X: cmpl $12331, 4(%esp) setne %al movzbl %al, %eax andl $1, %eax ret not this: _X: movl $14, %eax addl 4(%esp), %eax cmpl $12345, %eax setne %al movzbl %al, %eax andl $1, %eax ret Testcase here: Regression/CodeGen/X86/compare-add.ll nukage of the and coming up next. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@25898 91177308-0d34-0410-b5e6-96231b3b80d8
2006-02-01Fix some of the stuff in the PPC README file, and clean up legalizationNate Begeman
of the SELECT_CC, BR_CC, and BRTWOWAY_CC nodes. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@25875 91177308-0d34-0410-b5e6-96231b3b80d8
2006-01-30Move MaskedValueIsZero from the DAGCombiner to the TargetLowering ↵Chris Lattner
interface,making isMaskedValueZeroForTargetNode simpler, and useable from other partsof the compiler. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@25803 91177308-0d34-0410-b5e6-96231b3b80d8
2006-01-30pass the address of MaskedValueIsZero into isMaskedValueZeroForTargetNode,Chris Lattner
to permit recursion git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@25799 91177308-0d34-0410-b5e6-96231b3b80d8
2006-01-29eliminate uses of SelectionDAG::getBR2Way_CCChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@25767 91177308-0d34-0410-b5e6-96231b3b80d8
2006-01-28Add a missing case to the dag combiner.Nate Begeman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@25723 91177308-0d34-0410-b5e6-96231b3b80d8
2006-01-22Add explicit #includes of <iostream>Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@25515 91177308-0d34-0410-b5e6-96231b3b80d8
2006-01-18Get rid of code in the DAGCombiner that is duplicated in SelectionDAG.cppNate Begeman
Now all constant folding in the code generator is in one place. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@25426 91177308-0d34-0410-b5e6-96231b3b80d8
2006-01-18Fix a backwards conditional that caused an inf loop in some cases. ThisChris Lattner
fixes: test/Regression/CodeGen/Generic/2005-01-18-SetUO-InfLoop.ll git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@25419 91177308-0d34-0410-b5e6-96231b3b80d8
2006-01-15Disable two transformations that contribute to bus errors on SparcV8.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@25339 91177308-0d34-0410-b5e6-96231b3b80d8
2006-01-12Add a simple missing fold to produce this:Chris Lattner
subfic r3, r2, 33 instead of this: subfic r2, r2, 32 addi r3, r2, 1 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@25255 91177308-0d34-0410-b5e6-96231b3b80d8
2006-01-12Don't create rotate instructions in unsupported types, because we don't haveChris Lattner
promote/expand code yet. This fixes the 177.mesa failure on PPC. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@25250 91177308-0d34-0410-b5e6-96231b3b80d8
2006-01-11Add bswap, rotl, and rotr nodesNate Begeman
Add dag combiner code to recognize rotl, rotr Add ppc code to match rotl Targets should add rotl/rotr patterns if they have them git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@25222 91177308-0d34-0410-b5e6-96231b3b80d8
2006-01-06Revert the previous check-in. Leave shl x, 1 along for target to deal with.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@25121 91177308-0d34-0410-b5e6-96231b3b80d8
2006-01-06fold (shl x, 1) -> (add x, x)Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@25120 91177308-0d34-0410-b5e6-96231b3b80d8
2006-01-05Added initial support for DEBUG_LABEL allowing debug specific labels to beJim Laskey
inserted in the code. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@25104 91177308-0d34-0410-b5e6-96231b3b80d8
2006-01-04Add unique id to debug location for debug label use (work in progress.)Jim Laskey
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@25096 91177308-0d34-0410-b5e6-96231b3b80d8
2005-12-23Remove redundant debug locations.Jim Laskey
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@24995 91177308-0d34-0410-b5e6-96231b3b80d8
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