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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 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.