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path: root/lib/Target/PowerPC/README.txt
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* Generate PPC early conditional returnsHal Finkel2013-04-08
| | | | | | | | | | | | | PowerPC has a conditional branch to the link register (return) instruction: BCLR. This should be used any time when we'd otherwise have a conditional branch to a return. This adds a small pass, PPCEarlyReturn, which runs just prior to the branch selection pass (and, importantly, after block placement) to generate these conditional returns when possible. It will also eliminate unconditional branches to returns (these happen rarely; most of the time these have already been tail duplicated by the time PPCEarlyReturn is invoked). This is a nice optimization for small functions that do not maintain a stack frame. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@179026 91177308-0d34-0410-b5e6-96231b3b80d8
* Remove some obsolete PowerPC/README entriesHal Finkel2013-04-03
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@178657 91177308-0d34-0410-b5e6-96231b3b80d8
* Remove "gpr0 allocation" from the PPC README TODO listHal Finkel2013-03-27
| | | | | | As Chris pointed out, post r178123, this is now done! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@178165 91177308-0d34-0410-b5e6-96231b3b80d8
* Remove the TODO statement in the PPC README re: CTR loopsHal Finkel2012-06-08
| | | | | | | | As Chris points out, this can now be removed! TODO: check if the associated section on viterbi's inner loop can also be removed. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@158224 91177308-0d34-0410-b5e6-96231b3b80d8
* Renaming ISD::BIT_CONVERT to ISD::BITCAST to better reflect the LLVM IR concept.Wesley Peck2010-11-23
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@119990 91177308-0d34-0410-b5e6-96231b3b80d8
* add a readme.Chris Lattner2010-09-19
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@114303 91177308-0d34-0410-b5e6-96231b3b80d8
* Floating-point add, sub, and mul are now spelled fadd, fsub, and fmul,Dan Gohman2010-03-02
| | | | | | | respectively. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97531 91177308-0d34-0410-b5e6-96231b3b80d8
* Add the problem I just hacked around in 96015/96020.Dale Johannesen2010-02-12
| | | | | | | | | The solution there produces correct code, but is seriously deficient in several ways. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@96039 91177308-0d34-0410-b5e6-96231b3b80d8
* move PR5945 here.Chris Lattner2010-01-24
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@94350 91177308-0d34-0410-b5e6-96231b3b80d8
* change the canonical form of "cond ? -1 : 0" to be Chris Lattner2010-01-24
| | | | | | | | | "sext cond" instead of a select. This simplifies some instcombine code, matches the policy for zext (cond ? 1 : 0 -> zext), and allows us to generate better code for a testcase on ppc. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@94339 91177308-0d34-0410-b5e6-96231b3b80d8
* add a noteChris Lattner2010-01-23
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@94317 91177308-0d34-0410-b5e6-96231b3b80d8
* constant materialization could be improved.Chris Lattner2010-01-07
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92921 91177308-0d34-0410-b5e6-96231b3b80d8
* Remove the IA-64 backend.Dan Gohman2009-07-24
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@76920 91177308-0d34-0410-b5e6-96231b3b80d8
* clarify: stub emission depends on the version of the linker you use, it has ↵Chris Lattner2009-07-02
| | | | | | | | | | nothing to do with the target. Also, the stub elimination optimization *requires* making the stub explicit. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@74682 91177308-0d34-0410-b5e6-96231b3b80d8
* Add darwin stub removal to wishlist.Dale Johannesen2009-07-01
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@74667 91177308-0d34-0410-b5e6-96231b3b80d8
* Move some former testcases (low-probability codegenDale Johannesen2008-11-17
| | | | | | | | optimizations) into this wishlist. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@59455 91177308-0d34-0410-b5e6-96231b3b80d8
* Implement ISD::TRAP support on PPCNate Begeman2008-08-11
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@54644 91177308-0d34-0410-b5e6-96231b3b80d8
* add a noteChris Lattner2008-03-02
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47830 91177308-0d34-0410-b5e6-96231b3b80d8
* Evan implemented this.Chris Lattner2008-03-02
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47827 91177308-0d34-0410-b5e6-96231b3b80d8
* additional missing featureNate Begeman2008-02-11
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46948 91177308-0d34-0410-b5e6-96231b3b80d8
* If someone wants to implement ppc TRAP, they can go for it :)Chris Lattner2008-01-15
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46019 91177308-0d34-0410-b5e6-96231b3b80d8
* Finally implement correct ordered comparisons for PPC, even thoughChris Lattner2008-01-08
| | | | | | | | | the code generated is not wonderful. This turns a miscompilation into a code quality bug (noted in the ppc readme). This fixes PR642, which is over 2 years old (!). Nate, please review this. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45742 91177308-0d34-0410-b5e6-96231b3b80d8
* implement __builtin_return_addr(0) on ppc.Chris Lattner2007-12-08
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@44700 91177308-0d34-0410-b5e6-96231b3b80d8
* Add some notes about better flag handling.Chris Lattner2007-09-10
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@41808 91177308-0d34-0410-b5e6-96231b3b80d8
* new exampleChris Lattner2007-08-23
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@41318 91177308-0d34-0410-b5e6-96231b3b80d8
* add a noteChris Lattner2007-03-31
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@35530 91177308-0d34-0410-b5e6-96231b3b80d8
* add a noteChris Lattner2007-03-25
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@35334 91177308-0d34-0410-b5e6-96231b3b80d8
* add a noteChris Lattner2007-03-25
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@35330 91177308-0d34-0410-b5e6-96231b3b80d8
* add a noteChris Lattner2007-02-09
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@34101 91177308-0d34-0410-b5e6-96231b3b80d8
* Remove fixed itemNate Begeman2007-02-09
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@34081 91177308-0d34-0410-b5e6-96231b3b80d8
* A relatively simple PPC optimization.Chris Lattner2007-01-31
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@33709 91177308-0d34-0410-b5e6-96231b3b80d8
* Update some of the llvm in the readmeNate Begeman2007-01-29
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@33630 91177308-0d34-0410-b5e6-96231b3b80d8
* move contents of PR587 to here.Chris Lattner2007-01-18
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@33333 91177308-0d34-0410-b5e6-96231b3b80d8
* Rewrite the branch selector to be correct in the face of large functions.Chris Lattner2006-11-18
| | | | | | | | | | | | | | | | The algorithm it used before wasn't 100% correct, we now use an iterative expansion model. This fixes assembler errors when compiling 403.gcc with tail merging enabled. Change the way the branch selector works overall: Now, the isel generates PPC::BCC instructions (as it used to) directly, and these BCC instructions are emitted to the output or jitted directly if branches don't need expansion. Only if branches need expansion are instructions rewritten and created. This should make branch select faster, and eliminates the Bxx instructions from the .td file. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@31837 91177308-0d34-0410-b5e6-96231b3b80d8
* add note about ugly codegen with preincChris Lattner2006-11-10
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@31617 91177308-0d34-0410-b5e6-96231b3b80d8
* add a note from viterbiChris Lattner2006-11-07
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@31506 91177308-0d34-0410-b5e6-96231b3b80d8
* this doesn't occur any more in masonChris Lattner2006-10-27
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@31236 91177308-0d34-0410-b5e6-96231b3b80d8
* the code in question is now:Chris Lattner2006-10-27
| | | | | | | | | | | | | cmpw cr0, r7, r3 ble cr0, LBB1_5 ;bb25 LBB1_8: ;bb17 cmpw cr0, r8, r5 bgt cr0, LBB1_2 ;bb which is just as good as crnand. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@31235 91177308-0d34-0410-b5e6-96231b3b80d8
* add noteChris Lattner2006-10-13
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* Fold AND and ROTL more oftenNate Begeman2006-09-22
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@30577 91177308-0d34-0410-b5e6-96231b3b80d8
* item doneChris Lattner2006-09-20
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* This is already doneChris Lattner2006-09-20
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@30512 91177308-0d34-0410-b5e6-96231b3b80d8
* Two improvements:Chris Lattner2006-09-20
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 1. Codegen this comparison: if (X == 0x8000) as: cmplwi cr0, r3, 32768 bne cr0, LBB1_2 ;cond_next instead of: lis r2, 0 ori r2, r2, 32768 cmpw cr0, r3, r2 bne cr0, LBB1_2 ;cond_next 2. Codegen this comparison: if (X == 0x12345678) as: xoris r2, r3, 4660 cmplwi cr0, r2, 22136 bne cr0, LBB1_2 ;cond_next instead of: lis r2, 4660 ori r2, r2, 22136 cmpw cr0, r3, r2 bne cr0, LBB1_2 ;cond_next git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@30509 91177308-0d34-0410-b5e6-96231b3b80d8
* Add a note that we should match rlwnm betterChris Lattner2006-09-20
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@30508 91177308-0d34-0410-b5e6-96231b3b80d8
* add a noteChris Lattner2006-09-14
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@30377 91177308-0d34-0410-b5e6-96231b3b80d8
* Add a noteChris Lattner2006-07-14
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@29139 91177308-0d34-0410-b5e6-96231b3b80d8
* Implement Regression/CodeGen/PowerPC/bswap-load-store.ll by folding bswapsChris Lattner2006-07-10
| | | | | | | into i16/i32 load/stores. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@29089 91177308-0d34-0410-b5e6-96231b3b80d8
* Add a note about a noteChris Lattner2006-05-17
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28355 91177308-0d34-0410-b5e6-96231b3b80d8
* Yet more readme updatingNate Begeman2006-05-08
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28172 91177308-0d34-0410-b5e6-96231b3b80d8
* New note about something bad happening in target independent optimizersNate Begeman2006-05-08
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28170 91177308-0d34-0410-b5e6-96231b3b80d8
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