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arch-x86: implement POPCNT instruction.

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Change-Id: Id6ddc1245c81a17720885f9038d55d0811ef7f4d
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/39615
Reviewed-by: Gabe Black <gabe.black@gmail.com>
Maintainer: Gabe Black <gabe.black@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>
This commit is contained in:
Tong Shen
2021-01-25 11:25:38 -08:00
parent 99a6f42ef7
commit 6310051fc5
4 changed files with 31 additions and 4 deletions
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4
src/arch/x86/decoder_tables.cc
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@@ -115,7 +115,7 @@ namespace X86ISA
/* 8 */ 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0,
/* 9 */ 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1,
/* A */ 0 , 0 , 0 , 1 , 1 , 1 , 1 , 1 , 0 , 0 , 0 , 1 , 1 , 1 , 1 , 1,
/* B */ 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 0 , 0 , 1 , 1 , 1 , 1 , 1 , 1,
/* B */ 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 0 , 1 , 1 , 1 , 1 , 1 , 1,
/* C */ 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0,
/* D */ 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1,
/* E */ 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1 , 1,
@@ -234,7 +234,7 @@ namespace X86ISA
/* 8 */ ZW, ZW, ZW, ZW, ZW, ZW, ZW, ZW, ZW, ZW, ZW, ZW, ZW, ZW, ZW, ZW,
/* 9 */ 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 ,
/* A */ 0 , 0 , 0 , 0 , BY, 0 , 0 , 0 , 0 , 0 , 0 , 0 , BY, 0 , 0 , 0 ,
/* B */ 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , ZW, 0 , BY, 0 , 0 , 0 , 0 , 0 ,
/* B */ 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , BY, 0 , 0 , 0 , 0 , 0 ,
/* C */ 0 , 0 , BY, 0 , BY, BY, BY, 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 ,
/* D */ 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 ,
/* E */ 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 ,

3
src/arch/x86/isa/decoder/two_byte_opcodes.isa
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@@ -754,8 +754,7 @@
}
0x17: decode OPCODE_OP_BOTTOM3 {
0x0: decode LEGACY_REP {
0x0: WarnUnimpl::jmpe_Jz();
0x1: WarnUnimpl::popcnt_Gv_Ev();
0x1: POPCNT(Gv,Ev);
}
//0x1: group10_UD2();
0x1: UD2();

15
src/arch/x86/isa/insts/general_purpose/compare_and_test/bit_scan.py
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@@ -350,4 +350,19 @@ def macroop BSF_R_P {
end:
fault "NoFault"
};
def macroop POPCNT_R_R {
popcnt reg, regm, reg, dataSize=8
};
def macroop POPCNT_R_M {
ld t1, seg, sib, disp
popcnt reg, t1, reg, dataSize=8
};
def macroop POPCNT_R_P {
rdip t7
ld t1, seg, riprel, disp
popcnt reg, t1, reg, dataSize=8
};
'''

13
src/arch/x86/isa/microops/regop.isa
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@@ -1764,4 +1764,17 @@ let {{
code = '''
DestReg = X86ISA::convX87TagsToXTags(FTW);
'''
class Popcnt(RegOp):
code = '''
DestReg =
merge(DestReg, __builtin_popcountl(psrc1), dataSize);
'''
flag_code = '''
ccFlagBits = ccFlagBits & ~(SFBit | AFBit | ZFBit | PFBit);
if (findZero(dataSize * 8, SrcReg1)) {
ccFlagBits = ccFlagBits | ZFBit;
}
cfofBits = cfofBits & ~(OFBit | CFBit);
'''
}};