6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2026-04-26 12:20:42 +00:00
Code Issues Projects Releases Wiki Activity

When possible, custom lower 32-bit SINT_TO_FP to this:

Browse Source 
_foo2:
        extsw r2, r3
        std r2, -8(r1)
        lfd f0, -8(r1)
        fcfid f0, f0
        frsp f1, f0
        blr

instead of this:

_foo2:
        lis r2, ha16(LCPI2_0)
        lis r4, 17200
        xoris r3, r3, 32768
        stw r3, -4(r1)
        stw r4, -8(r1)
        lfs f0, lo16(LCPI2_0)(r2)
        lfd f1, -8(r1)
        fsub f0, f1, f0
        frsp f1, f0
        blr

This speeds up Misc/pi from 2.44s->2.09s with LLC and from 3.01->2.18s
with llcbeta (16.7% and 38.1% respectively).


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26943 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2006-03-22 05:30:33 +00:00
parent e5ba580ab0
commit ecfe55e65b
5 changed files with 92 additions and 32 deletions
Download Patch File Download Diff File Expand all files Collapse all files
lib/Target/PowerPC/PPCHazardRecognizers.cpp
+2 -1
View File
@@ -245,8 +245,9 @@ void PPCHazardRecognizer970::EmitInstruction(SDNode *Node) {
case PPC::STFIWX:
ThisStoreSize = 4;
break;
case PPC::STD_32:
case PPC::STDX_32:
case PPC::STD:
case PPC::STDU:
case PPC::STFD:
case PPC::STFDX:
case PPC::STDX: