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Some new entries about truncate / anyext

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28548 91177308-0d34-0410-b5e6-96231b3b80d8
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Evan Cheng 2006-05-30 06:23:50 +00:00
parent 66c873479f
commit 8c65fa564a
1 changed files with 16 additions and 0 deletions
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16
lib/Target/X86/README.txt
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@ -606,3 +606,19 @@ _bar:
The current isel scheme will not allow the load to be folded in the call since The current isel scheme will not allow the load to be folded in the call since
the load's chain result is read by the callseq_start. the load's chain result is read by the callseq_start.
//===---------------------------------------------------------------------===//
Don't forget to find a way to squash noop truncates in the JIT environment.
//===---------------------------------------------------------------------===//
Implement anyext in the same manner as truncate that would allow them to be
eliminated.
//===---------------------------------------------------------------------===//
How about implementing truncate / anyext as a property of machine instruction
operand? i.e. Print as 32-bit super-class register / 16-bit sub-class register.
Do this for the cases where a truncate / anyext is guaranteed to be eliminated.
For IA32 that is truncate from 32 to 16 and anyext from 16 to 32.