[llvm-commits] [llvm] r42785 - /llvm/trunk/lib/Target/X86/README.txt

[Dan Gohman]

Author: djg
Date: Tue Oct  9 10:42:21 2007
New Revision: 42785

URL: http://llvm.org/viewvc/llvm-project?rev=42785&view=rev
Log:
This is done.

Modified:
    llvm/trunk/lib/Target/X86/README.txt

Modified: llvm/trunk/lib/Target/X86/README.txt
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/X86/README.txt?rev=42785&r1=42784&r2=42785&view=diff

==============================================================================
--- llvm/trunk/lib/Target/X86/README.txt (original)
+++ llvm/trunk/lib/Target/X86/README.txt Tue Oct  9 10:42:21 2007
@@ -10,36 +10,6 @@
 
 //===---------------------------------------------------------------------===//
 
-Add a MUL2U and MUL2S nodes to represent a multiply that returns both the
-Hi and Lo parts (combination of MUL and MULH[SU] into one node).  Add this to
-X86, & make the dag combiner produce it when needed.  This will eliminate one
-imul from the code generated for:
-
-long long test(long long X, long long Y) { return X*Y; }
-
-by using the EAX result from the mul.  We should add a similar node for
-DIVREM.
-
-another case is:
-
-long long test(int X, int Y) { return (long long)X*Y; }
-
-... which should only be one imul instruction.
-
-or:
-
-unsigned long long int t2(unsigned int a, unsigned int b) {
-       return (unsigned long long)a * b;
-}
-
-... which should be one mul instruction.
-
-
-This can be done with a custom expander, but it would be nice to move this to
-generic code.
-
-//===---------------------------------------------------------------------===//
-
 CodeGen/X86/lea-3.ll:test3 should be a single LEA, not a shift/move.  The X86
 backend knows how to three-addressify this shift, but it appears the register
 allocator isn't even asking it to do so in this case.  We should investigate