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Remove README entry obsoleted by register masks.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@154588 91177308-0d34-0410-b5e6-96231b3b80d8
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Benjamin Kramer 2012-04-12 12:47:29 +00:00
parent 0ce12d5a07
commit 503a86b731
1 changed files with 0 additions and 16 deletions
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lib/Target/README.txt
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@ -2,22 +2,6 @@ Target Independent Opportunities:
//===---------------------------------------------------------------------===//
With the recent changes to make the implicit def/use set explicit in
machineinstrs, we should change the target descriptions for 'call' instructions
so that the .td files don't list all the call-clobbered registers as implicit
defs. Instead, these should be added by the code generator (e.g. on the dag).
This has a number of uses:
1. PPC32/64 and X86 32/64 can avoid having multiple copies of call instructions
for their different impdef sets.
2. Targets with multiple calling convs (e.g. x86) which have different clobber
sets don't need copies of call instructions.
3. 'Interprocedural register allocation' can be done to reduce the clobber sets
of calls.
//===---------------------------------------------------------------------===//
We should recognized various "overflow detection" idioms and translate them into
llvm.uadd.with.overflow and similar intrinsics. Here is a multiply idiom: