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path: root/llvm/lib/CodeGen/OptimizeExts.cpp
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* It's an error to translate this:Bill Wendling2010-06-091-0/+20
| | | | | | | | | | | | | | | | | | | | %reg1025 = <sext> %reg1024 ... %reg1026 = SUBREG_TO_REG 0, %reg1024, 4 into this: %reg1025 = <sext> %reg1024 ... %reg1027 = EXTRACT_SUBREG %reg1025, 4 %reg1026 = SUBREG_TO_REG 0, %reg1027, 4 The problem here is that SUBREG_TO_REG is there to assert that an implicit zext occurs. It doesn't insert a zext instruction. If we allow the EXTRACT_SUBREG here, it will give us the value after the <sext>, not the original value of %reg1024 before <sext>. llvm-svn: 105741
* Handle DEBUG_VALUE in this pass.Dale Johannesen2010-03-261-11/+14
| | | | llvm-svn: 99573
* move target-independent opcodes out of TargetInstrInfoChris Lattner2010-02-091-3/+3
| | | | | | | | | into TargetOpcodes.h. #include the new TargetOpcodes.h into MachineInstr. Add new inline accessors (like isPHI()) to MachineInstr, and start using them throughout the codebase. llvm-svn: 95687
* Do not extend extension results beyond the use of a PHI instruction at the ↵Evan Cheng2010-01-191-0/+12
| | | | | | start of a use block. A PHI use is expected to kill its source values. llvm-svn: 93895
* Commit some changes I had managed to lose last night while refactoring the ↵Evan Cheng2010-01-131-1/+6
| | | | | | | | code. Avoid change use of PHI instructions because it's not legal to insert any instructions before them. This fixes PR6027. llvm-svn: 93335
* Add comment; refactor; avoid pulling in DT if it's not used.Evan Cheng2010-01-131-79/+110
| | | | llvm-svn: 93306
* Add a quick pass to optimize sign / zero extension instructions. For targets ↵Evan Cheng2010-01-131-0/+149
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. llvm-svn: 93278
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