Chris Lattner 5e8ca66914 Make IVUseShouldUsePostIncValue more aggressive when the use is a PHI. In ... particular, it should realize that phi's use their values in the pred block not the phi block itself. This change turns our em3d loop from this: _test: cmpwi cr0, r4, 0 bgt cr0, LBB_test_2 ; entry.no_exit_crit_edge LBB_test_1: ; entry.loopexit_crit_edge li r2, 0 b LBB_test_6 ; loopexit LBB_test_2: ; entry.no_exit_crit_edge li r6, 0 LBB_test_3: ; no_exit or r2, r6, r6 lwz r6, 0(r3) cmpw cr0, r6, r5 beq cr0, LBB_test_6 ; loopexit LBB_test_4: ; endif addi r3, r3, 4 addi r6, r2, 1 cmpw cr0, r6, r4 blt cr0, LBB_test_3 ; no_exit LBB_test_5: ; endif.loopexit.loopexit_crit_edge addi r3, r2, 1 blr LBB_test_6: ; loopexit or r3, r2, r2 blr into: _test: cmpwi cr0, r4, 0 bgt cr0, LBB_test_2 ; entry.no_exit_crit_edge LBB_test_1: ; entry.loopexit_crit_edge li r2, 0 b LBB_test_5 ; loopexit LBB_test_2: ; entry.no_exit_crit_edge li r6, 0 LBB_test_3: ; no_exit lwz r2, 0(r3) cmpw cr0, r2, r5 or r2, r6, r6 beq cr0, LBB_test_5 ; loopexit LBB_test_4: ; endif addi r3, r3, 4 addi r6, r6, 1 cmpw cr0, r6, r4 or r2, r6, r6 blt cr0, LBB_test_3 ; no_exit LBB_test_5: ; loopexit or r3, r2, r2 blr Unfortunately, this is actually worse code, because the register coallescer is getting confused somehow. If it were doing its job right, it could turn the code into this: _test: cmpwi cr0, r4, 0 bgt cr0, LBB_test_2 ; entry.no_exit_crit_edge LBB_test_1: ; entry.loopexit_crit_edge li r6, 0 b LBB_test_5 ; loopexit LBB_test_2: ; entry.no_exit_crit_edge li r6, 0 LBB_test_3: ; no_exit lwz r2, 0(r3) cmpw cr0, r2, r5 beq cr0, LBB_test_5 ; loopexit LBB_test_4: ; endif addi r3, r3, 4 addi r6, r6, 1 cmpw cr0, r6, r4 blt cr0, LBB_test_3 ; no_exit LBB_test_5: ; loopexit or r3, r6, r6 blr ... which I'll work on next. :) git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23604 91177308-0d34-0410-b5e6-96231b3b80d8		2005-10-03 02:50:05 +00:00
..
Analysis	wrap a long line	2005-09-28 22:30:58 +00:00
Archive	speed up Archive::isBytecodeArchive in the case when the archive doesn't have	2005-09-23 06:22:58 +00:00
AsmParser	Implement PR614:	2005-08-27 18:50:39 +00:00
Bytecode	speed up Archive::isBytecodeArchive in the case when the archive doesn't have	2005-09-23 06:22:58 +00:00
CodeGen	Fix a problem where the legalizer would run out of stack space on extremely	2005-10-02 17:49:46 +00:00
Debugger	For PR495:	2005-07-07 23:21:43 +00:00
ExecutionEngine	Add help support for -mcpu and -mattr.	2005-09-02 19:27:43 +00:00
Linker	For PR495:	2005-07-07 23:21:43 +00:00
Support	Allow bugpoint+PPC codegen to use fsqrt	2005-08-29 13:14:24 +00:00
System	For PR616:	2005-08-24 10:07:20 +00:00
Target	silence some warnings	2005-10-02 16:29:36 +00:00
Transforms	Make IVUseShouldUsePostIncValue more aggressive when the use is a PHI. In	2005-10-03 02:50:05 +00:00
VMCore	Split SimpleConstantVal up into its components, so each Constant subclass getsa different enum value. This allows 'classof' for these to be really simple,not needing to call getType() anymore.	2005-09-27 06:09:08 +00:00
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