ShuriZma
/
dolphin
mirror of https://github.com/dolphin-emu/dolphin.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

Jit_Integer: rlwinmx: Use BEXTR where possible

This commit is contained in:
MerryMage 2020-12-27 15:08:45 +00:00
parent 263784639b
commit 73b6166f18
1 changed files with 8 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
Source/Core/Core/PowerPC/Jit64/Jit_Integer.cpp
View File

@ -1534,6 +1534,7 @@ void Jit64::rlwinmx(UGeckoInstruction inst)
{
const bool left_shift = inst.SH && inst.MB == 0 && inst.ME == 31 - inst.SH;
const bool right_shift = inst.SH && inst.ME == 31 && inst.MB == 32 - inst.SH;
const bool field_extract = inst.SH && inst.ME == 31 && inst.MB > 32 - inst.SH;
const u32 mask = MakeRotationMask(inst.MB, inst.ME);
const bool simple_mask = mask == 0xff || mask == 0xffff;
// In case of a merged branch, track whether or not we've set flags.
@ -1565,6 +1566,13 @@ void Jit64::rlwinmx(UGeckoInstruction inst)
SHL(32, Ra, Imm8(inst.SH));
needs_sext = inst.SH + mask_size >= 32;
}
// Use BEXTR where possible: Only AMD implements this in one uop
else if (field_extract && cpu_info.bBMI1 && cpu_info.vendor == CPUVendor::AMD)
{
MOV(32, R(RSCRATCH), Imm32((mask_size << 8) | (32 - inst.SH)));
BEXTR(32, Ra, Rs, RSCRATCH);
needs_sext = false;
}
else
{
if (a != s)