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| author | Benjamin Kramer <benny.kra@googlemail.com> | 2012-04-12 12:47:29 +0000 |
|---|---|---|
| committer | Benjamin Kramer <benny.kra@googlemail.com> | 2012-04-12 12:47:29 +0000 |
| commit | 503a86b731b9605e6fa3cab4458453e83347369f (patch) | |
| tree | 82a7c06422467a2f8591bd08f7661d46a2850a97 /lib/Target/README.txt | |
| parent | 0ce12d5a078a00f56d9470cfb951857b2a89ac06 (diff) | |
| download | llvm-503a86b731b9605e6fa3cab4458453e83347369f.tar.gz llvm-503a86b731b9605e6fa3cab4458453e83347369f.tar.bz2 llvm-503a86b731b9605e6fa3cab4458453e83347369f.tar.xz | |
Remove README entry obsoleted by register masks.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@154588 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Target/README.txt')
| -rw-r--r-- | lib/Target/README.txt | 16 |
1 files changed, 0 insertions, 16 deletions
diff --git a/lib/Target/README.txt b/lib/Target/README.txt index 3c21ddae80..093255e6af 100644 --- a/lib/Target/README.txt +++ b/lib/Target/README.txt @@ -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: |