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Branch selection support implemented by Nate Begeman for long branches.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@15288 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Misha Brukman 2004-07-27 18:43:04 +00:00
parent fe2597a55c
commit 4ce5ce25e8
1 changed files with 8 additions and 1 deletions
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9
lib/Target/PowerPC/README.txt
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@ -3,7 +3,6 @@ Currently unimplemented:
* signed right shift of long by reg
Current bugs:
* conditional branches assume target is within 32k bytes
* large fixed-size allocas not correct, although should
be closer to working. Added code in PPCRegisterInfo.cpp
to do >16bit subtractions to the stack pointer.
@ -12,6 +11,14 @@ Codegen improvements needed:
* no alias analysis causes us to generate slow code for Shootout/matrix
* setCondInst needs to know branchless versions of seteq/setne/etc
* cast elimination pass (uint -> sbyte -> short, kill the byte -> short)
* should hint to the branch select pass that it doesn't need to print the
second unconditional branch, so we don't end up with things like:
.LBBl42__2E_expand_function_8_21: ; LeafBlock37
cmplwi cr0, r29, 11
bne cr0, $+8
b .LBBl42__2E_expand_function_8_674 ; loopentry.24
b .LBBl42__2E_expand_function_8_42 ; NewDefault
b .LBBl42__2E_expand_function_8_42 ; NewDefault
Current hacks:
* lazy insert of GlobalBaseReg definition at front of first MBB