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* clarify a noteChris Lattner2008-01-121-1/+9
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45914 91177308-0d34-0410-b5e6-96231b3b80d8
* add some notes.Chris Lattner2008-01-111-0/+18
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45854 91177308-0d34-0410-b5e6-96231b3b80d8
* add a noteChris Lattner2008-01-101-0/+50
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45837 91177308-0d34-0410-b5e6-96231b3b80d8
* add a noteChris Lattner2008-01-091-0/+21
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45766 91177308-0d34-0410-b5e6-96231b3b80d8
* possible switch lowering improvement.Chris Lattner2008-01-071-0/+5
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45720 91177308-0d34-0410-b5e6-96231b3b80d8
* add a noteChris Lattner2008-01-071-0/+7
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45698 91177308-0d34-0410-b5e6-96231b3b80d8
* this is done.Chris Lattner2007-12-291-7/+0
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* expand note.Chris Lattner2007-12-291-0/+4
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* add a note.Chris Lattner2007-12-281-0/+32
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45388 91177308-0d34-0410-b5e6-96231b3b80d8
* add a noteChris Lattner2007-12-281-0/+19
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45377 91177308-0d34-0410-b5e6-96231b3b80d8
* Fold certain additions through selects (and their compares) so as to ↵Christopher Lamb2007-12-181-18/+0
| | | | | | | | | eliminate subtractions. This code is often produced by the SMAX expansion in SCEV. This implements test/Transforms/InstCombine/2007-12-18-AddSelCmpSub.ll git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45158 91177308-0d34-0410-b5e6-96231b3b80d8
* add a missed case.Chris Lattner2007-12-181-0/+18
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* implement a readme entry, compiling the code into:Chris Lattner2007-12-061-38/+0
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | _foo: movl $12, %eax andl 4(%esp), %eax movl _array(%eax), %eax ret instead of: _foo: movl 4(%esp), %eax shrl $2, %eax andl $3, %eax movl _array(,%eax,4), %eax ret As it turns out, this triggers all the time, in a wide variety of situations, for example, I see diffs like this in various programs: - movl 8(%eax), %eax - shll $2, %eax - andl $1020, %eax - movl (%esi,%eax), %eax + movzbl 8(%eax), %eax + movl (%esi,%eax,4), %eax - shll $2, %edx - andl $1020, %edx - movl (%edi,%edx), %edx + andl $255, %edx + movl (%edi,%edx,4), %edx Unfortunately, I also see stuff like this, which can be fixed in the X86 backend: - andl $85, %ebx - addl _bit_count(,%ebx,4), %ebp + shll $2, %ebx + andl $340, %ebx + addl _bit_count(%ebx), %ebp git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@44656 91177308-0d34-0410-b5e6-96231b3b80d8
* add a noteChris Lattner2007-12-051-0/+37
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@44638 91177308-0d34-0410-b5e6-96231b3b80d8
* add a noteChris Lattner2007-10-031-0/+16
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@42573 91177308-0d34-0410-b5e6-96231b3b80d8
* add a noteChris Lattner2007-05-051-0/+25
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@36811 91177308-0d34-0410-b5e6-96231b3b80d8
* the mason example is implemented. Move some examples out of llvm/test,Chris Lattner2007-05-051-36/+51
| | | | | | | upgrade the syntax of some other examples. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@36806 91177308-0d34-0410-b5e6-96231b3b80d8
* add a bad case evan though of.Chris Lattner2007-03-241-0/+32
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@35296 91177308-0d34-0410-b5e6-96231b3b80d8
* minor updatesChris Lattner2007-03-181-8/+6
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@35143 91177308-0d34-0410-b5e6-96231b3b80d8
* This is implemented. We now generate:Nick Lewycky2007-03-181-40/+0
| | | | | | | | | | | | | | | | | | | | | | | entry: icmp ugt i32 %x, 4 ; <i1>:0 [#uses=1] br i1 %0, label %cond_true, label %cond_false cond_true: ; preds = %entry %tmp1 = tail call i32 (...)* @bar( i32 12 ) ; <i32> [#uses=0] ret void cond_false: ; preds = %entry switch i32 %x, label %cond_true15 [ i32 4, label %cond_true3 i32 3, label %cond_true7 i32 2, label %cond_true11 i32 0, label %cond_false17 ] ... git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@35142 91177308-0d34-0410-b5e6-96231b3b80d8
* For PR1195:Reid Spencer2007-02-151-3/+3
| | | | | | | | Change use of "packed" term to "vector" in comments, strings, variable names, etc. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@34300 91177308-0d34-0410-b5e6-96231b3b80d8
* add a noteChris Lattner2007-02-131-0/+4
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@34249 91177308-0d34-0410-b5e6-96231b3b80d8
* add a note: we need whole-function selectiondags :)Chris Lattner2007-01-161-0/+28
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* For PR950:Reid Spencer2006-12-231-1/+1
| | | | | | | | | This patch removes the SetCC instructions and replaces them with the ICmp and FCmp instructions. The SetCondInst instruction has been removed and been replaced with ICmpInst and FCmpInst. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@32751 91177308-0d34-0410-b5e6-96231b3b80d8
* Evan implemented the machineinstr improvements.Chris Lattner2006-12-111-46/+23
| | | | | | | | | The rot example works if the type is cast to ubyte. Move sroa examples together and upgrade them to HEAD syntax. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@32423 91177308-0d34-0410-b5e6-96231b3b80d8
* add a noteChris Lattner2006-12-081-0/+10
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@32347 91177308-0d34-0410-b5e6-96231b3b80d8
* doneChris Lattner2006-11-291-16/+0
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* add a noteChris Lattner2006-11-141-0/+16
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@31719 91177308-0d34-0410-b5e6-96231b3b80d8
* Cute example from Chris Lattner.Nick Lewycky2006-11-131-0/+40
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* add a note about viterbiChris Lattner2006-11-101-0/+6
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* add a noteChris Lattner2006-11-061-0/+16
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* add a noteChris Lattner2006-11-031-0/+6
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* For PR950:Reid Spencer2006-10-261-0/+13
| | | | | | | | | Make necessary changes to support DIV -> [SUF]Div. This changes llvm to have three division instructions: signed, unsigned, floating point. The bytecode and assembler are bacwards compatible, however. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@31195 91177308-0d34-0410-b5e6-96231b3b80d8
* new bad caseChris Lattner2006-10-241-0/+19
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* add a note about a general improvement to the code generatorChris Lattner2006-09-281-1/+15
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* more notesChris Lattner2006-09-251-0/+22
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* item doneChris Lattner2006-09-191-11/+0
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* This is closer to what we really want.Chris Lattner2006-09-181-2/+3
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* add a note noticed through source inspectionChris Lattner2006-09-161-3/+30
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* add a nate noteChris Lattner2006-09-151-0/+6
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* We compile this into:Chris Lattner2006-08-241-18/+0
| | | | | | | | | | | | | _swap_16: slwi r2, r3, 24 rlwimi r2, r3, 8, 8, 15 srwi r3, r2, 16 blr now. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@29864 91177308-0d34-0410-b5e6-96231b3b80d8
* Owen implemented this.Chris Lattner2006-08-241-11/+0
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* Add a noteChris Lattner2006-05-301-0/+19
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* Add a noteChris Lattner2006-05-211-0/+12
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* Add a noteChris Lattner2006-05-191-0/+19
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* Move a target-independent note out of the X86 readme.Chris Lattner2006-05-191-0/+12
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* add a noteChris Lattner2006-05-181-0/+18
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28384 91177308-0d34-0410-b5e6-96231b3b80d8
* add a noteChris Lattner2006-04-201-0/+18
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@27907 91177308-0d34-0410-b5e6-96231b3b80d8
* New noteChris Lattner2006-04-021-0/+6
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* ADd a noteChris Lattner2006-04-011-0/+12
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