From 503a86b731b9605e6fa3cab4458453e83347369f Mon Sep 17 00:00:00 2001 From: Benjamin Kramer Date: Thu, 12 Apr 2012 12:47:29 +0000 Subject: [PATCH] Remove README entry obsoleted by register masks. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@154588 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/Target/README.txt | 16 ---------------- 1 file changed, 16 deletions(-) diff --git a/lib/Target/README.txt b/lib/Target/README.txt index 3c21ddae80c..093255e6af2 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: