6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2025-01-14 16:33:28 +00:00
Code Issues Projects Releases Wiki Activity

New note, Nate, please check to see if I'm full of it :)

Browse Source 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28118 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2006-05-05 05:36:15 +00:00
parent 4b75e73791
commit 55c63257f3
1 changed files with 33 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

33
lib/Target/PowerPC/README.txt
View File

@ -559,3 +559,36 @@ transformation, good for PI. See PPCISelLowering.cpp, this comment:
// need to flag these together so that the value isn't live across a call.
//setOperationAction(ISD::SINT_TO_FP, MVT::i32, Custom);
===-------------------------------------------------------------------------===
Another missed rlwimi case:
void %foo(uint *%tmp) {
%tmp = load uint* %tmp ; <uint> [#uses=3]
%tmp1 = shr uint %tmp, ubyte 31 ; <uint> [#uses=1]
%tmp1 = cast uint %tmp1 to ubyte ; <ubyte> [#uses=1]
%tmp4.mask = shr uint %tmp, ubyte 30 ; <uint> [#uses=1]
%tmp4.mask = cast uint %tmp4.mask to ubyte ; <ubyte> [#uses=1]
%tmp = or ubyte %tmp4.mask, %tmp1 ; <ubyte> [#uses=1]
%tmp10 = cast ubyte %tmp to uint ; <uint> [#uses=1]
%tmp11 = shl uint %tmp10, ubyte 31 ; <uint> [#uses=1]
%tmp12 = and uint %tmp, 2147483647 ; <uint> [#uses=1]
%tmp13 = or uint %tmp11, %tmp12 ; <uint> [#uses=1]
store uint %tmp13, uint* %tmp
ret void
}
We emit:
_foo:
lwz r2, 0(r3)
srwi r4, r2, 30
srwi r5, r2, 31
or r4, r4, r5
slwi r4, r4, 31
rlwimi r4, r2, 0, 1, 31
stw r4, 0(r3)
blr
I *think* that could use another rlwimi.