6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2024-12-14 11:32:34 +00:00
Code Issues Projects Releases Wiki Activity

Fix comment so it doesn't include comments which are irrelevant to the x86

Browse Source 
backend.  Add a FIXME noting what can be fixed here.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@105342 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Eli Friedman 2010-06-02 19:35:46 +00:00
parent 71c62a2977
commit 962f549d20
1 changed files with 5 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
lib/Target/X86/X86ISelLowering.cpp
View File

@ -981,16 +981,12 @@ X86TargetLowering::X86TargetLowering(X86TargetMachine &TM)
setOperationAction(ISD::USUBO, MVT::i32, Custom);
setOperationAction(ISD::SMULO, MVT::i32, Custom);
// Don't try to custom-lower 64-bit add-with-overflow and friends
// on x86-32; the x86 backend currently doesn't know how to handle them.
// Only custom-lower 64-bit SADDO and friends on 64-bit because we don't
// handle type legalization for these operations here.
//
// This doesn't really fix anything because LegalizeTypes doesn't know
// how to handle them either. We do get a better error message, though.
//
// This may not be hard to implement though.
// In fact you could even cheat, and turn the 64 bit add-with-overflow
// into a 65 bit add, with the top bit being used to compute the overflow
// flag. That should then all get expanded out automagically.
// FIXME: We really should do custom legalization for addition and
// subtraction on x86-32 once PR3203 is fixed. We really can't do much better
// than generic legalization for 64-bit multiplication-with-overflow, though.
if (Subtarget->is64Bit()) {
setOperationAction(ISD::SADDO, MVT::i64, Custom);
setOperationAction(ISD::UADDO, MVT::i64, Custom);