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* OK, that's it. This test is going away now. But don't worry, I am taking it to aJakob Stoklund Olesen2010-08-031-361/+0
| | | | | | | | | | nice farm in the country where it can play with other tests. And bunnies. It is not clear what is being tested, and the revision history shows a bunch of random changes to the expected instruction count. Clearly, we are just fudging it to pass whenever it fails. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@110118 91177308-0d34-0410-b5e6-96231b3b80d8
* - Clean up some crappy code which deals with coalescing of copies which look atEvan Cheng2010-04-211-2/+2
| | | | | | | | extract_subreg / insert_subreg, etc. - Add support for more aggressive insert_subreg coalescing. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@101971 91177308-0d34-0410-b5e6-96231b3b80d8
* Fix typo.Evan Cheng2010-03-101-1/+1
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@98142 91177308-0d34-0410-b5e6-96231b3b80d8
* Enable machine cse pass.Evan Cheng2010-03-101-1/+2
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@98132 91177308-0d34-0410-b5e6-96231b3b80d8
* Reapply coalescer fix for better cross-class coalescing.Jakob Stoklund Olesen2010-02-111-1/+1
| | | | | | This time with fixed test cases. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@95938 91177308-0d34-0410-b5e6-96231b3b80d8
* Commit some changes I had managed to lose last night while refactoring the ↵Evan Cheng2010-01-131-1/+1
| | | | | | | | | code. Avoid change use of PHI instructions because it's not legal to insert any instructions before them. This fixes PR6027. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@93335 91177308-0d34-0410-b5e6-96231b3b80d8
* Re-enable extension optimization pass.Evan Cheng2010-01-131-1/+1
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@93313 91177308-0d34-0410-b5e6-96231b3b80d8
* Disable opt-ext pass to unbreak the build for now.Evan Cheng2010-01-131-1/+1
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@93286 91177308-0d34-0410-b5e6-96231b3b80d8
* Add a quick pass to optimize sign / zero extension instructions. For targets ↵Evan Cheng2010-01-131-1/+1
| | | | | | | | | where the pre-extension values are available in the subreg of the result of the extension, replace the uses of the pre-extension value with the result + extract_subreg. For now, this pass is fairly conservative. It only perform the replacement when both the pre- and post- extension values are used in the block. It will miss cases where the post-extension values are live, but not used. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@93278 91177308-0d34-0410-b5e6-96231b3b80d8
* Remove fragile test.Jakob Stoklund Olesen2009-11-171-1/+0
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@89150 91177308-0d34-0410-b5e6-96231b3b80d8
* Enable -split-phi-edges by default, except when -regalloc=local.Jakob Stoklund Olesen2009-11-171-1/+1
| | | | | | | The local register allocator doesn't like it when LiveVariables is run. We should also disable edge splitting under -O0, but that has to wait a bit. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@89125 91177308-0d34-0410-b5e6-96231b3b80d8
* Revert 89021. It's miscompiling llvm-gcc driver driver at -O0.Evan Cheng2009-11-171-3/+1
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@89082 91177308-0d34-0410-b5e6-96231b3b80d8
* Enable -split-phi-edges by defaultJakob Stoklund Olesen2009-11-171-1/+3
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@89021 91177308-0d34-0410-b5e6-96231b3b80d8
* Move zext and sext casts fed by loads into the same block as theDan Gohman2009-10-161-2/+2
| | | | | | | | load, to help SelectionDAG fold them into the loads, unless conditions are unfavorable. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84271 91177308-0d34-0410-b5e6-96231b3b80d8
* Clean up spill weight computation. Also some changes to give loop inductionEvan Cheng2009-09-211-2/+2
| | | | | | | | | | | variable increment / decrement slighter high priority. This has major impact on some micro-benchmarks. On MultiSource/Applications and spec tests, it's a minor win. It also reduce 256.bzip instruction count by 8%, 55 on 164.gzip on i386 / Darwin. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@82485 91177308-0d34-0410-b5e6-96231b3b80d8
* Add support for using the FLAGS result of or, xor, and and instructionsDan Gohman2009-09-181-3/+2
| | | | | | | | on x86, to avoid explicit test instructions. A few existing tests changed due to arbitrary register allocation differences. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@82263 91177308-0d34-0410-b5e6-96231b3b80d8
* Eliminate more uses of llvm-as and llvm-dis.Dan Gohman2009-09-081-1/+1
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@81290 91177308-0d34-0410-b5e6-96231b3b80d8
* Stabilize the order of live intervals in the priority_queue used by theBob Wilson2009-09-051-1/+1
| | | | | | | | | | | | | | linear scan reg alloc. This fixes a problem I ran into where extracting a function from a larger file caused the generated code to change (masking the problem I was trying to debug) because the allocator behaved differently. This changes the results for two X86 regression checks. stack-color-with-reg is improved, with one less instruction, but pr3495 is worse, with one more copy. As far as I can tell, these tests were just getting lucky or unlucky, so I've changed the expected results. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@81060 91177308-0d34-0410-b5e6-96231b3b80d8
* Enable the new no-SP register classes by default. This is to addressDan Gohman2009-08-051-1/+1
| | | | | | | | PR4572. A few tests have some minor code regressions due to different coalescing. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@78217 91177308-0d34-0410-b5e6-96231b3b80d8
* Revert changes accidentally committed along with r78163.Dan Gohman2009-08-051-1/+1
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@78165 91177308-0d34-0410-b5e6-96231b3b80d8
* Teach X86FastISel how to handle CCValAssign::BCvt, which is used forDan Gohman2009-08-051-1/+1
| | | | | | | MMX arguments. This fixes PR4684. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@78163 91177308-0d34-0410-b5e6-96231b3b80d8
* LowerSubregsInstructionPass::LowerExtract should not extend the live range ↵Jakob Stoklund Olesen2009-08-041-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | of registers. When LowerExtract eliminates an EXTRACT_SUBREG with a kill flag, it moves the kill flag to the place where the sub-register is killed. This can accidentally overlap with the use of a sibling sub-register, and we have trouble. In the test case we have this code: Live Ins: %R0 %R1 %R2 %R2L<def> = EXTRACT_SUBREG %R2<kill>, 1 %R2H<def> = LOAD16fi <fi#-1>, 0, Mem:LD(2,4) [FixedStack-1 + 0] %R1L<def> = EXTRACT_SUBREG %R1<kill>, 1 %R0L<def> = EXTRACT_SUBREG %R0<kill>, 1 %R0H<def> = ADD16 %R2H<kill>, %R2L<kill>, %AZ<imp-def>, %AN<imp-def>, %AC0<imp-def>, %V<imp-def>, %VS<imp-def> subreg: CONVERTING: %R2L<def> = EXTRACT_SUBREG %R2<kill>, 1 subreg: eliminated! subreg: killed here: %R0H<def> = ADD16 %R2H, %R2L, %R2<imp-use,kill>, %AZ<imp-def>, %AN<imp-def>, %AC0<imp-def>, %V<imp-def>, %VS<imp-def> The kill flag on %R2 is moved to the last instruction, and the live range overlaps with the definition of %R2H: *** Bad machine code: Redefining a live physical register *** - function: f - basic block: 0x18358c0 (#0) - instruction: %R2H<def> = LOAD16fi <fi#-1>, 0, Mem:LD(2,4) [FixedStack-1 + 0] Register R2H was defined but already live. The fix is to replace EXTRACT_SUBREG with IMPLICIT_DEF instead of eliminating it completely: subreg: CONVERTING: %R2L<def> = EXTRACT_SUBREG %R2<kill>, 1 subreg: replace by: %R2L<def> = IMPLICIT_DEF %R2<kill> Note that these IMPLICIT_DEF instructions survive to the asm output. It is necessary to fix the stack-color-with-reg test case because of that. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@78093 91177308-0d34-0410-b5e6-96231b3b80d8
* Catch more coalescing opportunities.Evan Cheng2009-07-181-1/+1
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@76282 91177308-0d34-0410-b5e6-96231b3b80d8
* Enable cross register class coalescing.Evan Cheng2009-07-181-1/+2
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@76281 91177308-0d34-0410-b5e6-96231b3b80d8
* Fixed a stack slot coloring with reg bug: do not update implicit use / def ↵Evan Cheng2009-05-121-2/+1
| | | | | | when doing forward / backward propagation. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@71574 91177308-0d34-0410-b5e6-96231b3b80d8
* Temporarily revert r71010. It was causing massive failures during self-hosting.Bill Wendling2009-05-071-0/+1
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@71138 91177308-0d34-0410-b5e6-96231b3b80d8
* Enable stack coloring with regs at -O3.Evan Cheng2009-05-051-0/+361
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@71010 91177308-0d34-0410-b5e6-96231b3b80d8
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