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cmd/6l, cmd/8l: use one-byte XCHG forms when possible

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Pointed out by khr.

R=ken2
CC=golang-dev
https://golang.org/cl/11145044
This commit is contained in:
Russ Cox 2013-07-12 20:58:38 -04:00
parent 4274d074dc
commit aad4720b51
2 changed files with 11 additions and 7 deletions
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10
src/cmd/6l/optab.c
View file

@ -247,8 +247,10 @@ uchar yrb_mb[] =
Yrb, Ymb, Zr_m, 1,
0
};
uchar yml_ml[] =
uchar yxchg[] =
{
Yax, Yrl, Z_rp, 1,
Yrl, Yax, Zrp_, 1,
Yrl, Yml, Zr_m, 1,
Yml, Yrl, Zm_r, 1,
0
@ -1174,9 +1176,9 @@ Optab optab[] =
{ AWAIT, ynone, Px, 0x9b },
{ AWORD, ybyte, Px, 2 },
{ AXCHGB, yml_mb, Pb, 0x86,0x86 },
{ AXCHGL, yml_ml, Px, 0x87,0x87 },
{ AXCHGQ, yml_ml, Pw, 0x87,0x87 },
{ AXCHGW, yml_ml, Pe, 0x87,0x87 },
{ AXCHGL, yxchg, Px, 0x90,0x90,0x87,0x87 },
{ AXCHGQ, yxchg, Pw, 0x90,0x90,0x87,0x87 },
{ AXCHGW, yxchg, Pe, 0x90,0x90,0x87,0x87 },
{ AXLAT, ynone, Px, 0xd7 },
{ AXORB, yxorb, Pb, 0x34,0x80,(06),0x30,0x32 },
{ AXORL, yxorl, Px, 0x83,(06),0x35,0x81,(06),0x31,0x33 },

8
src/cmd/8l/optab.c
View file

@ -196,8 +196,10 @@ uchar yml_mb[] =
Ymb, Yrb, Zm_r, 1,
0
};
uchar yml_ml[] =
uchar yxchg[] =
{
Yax, Yrl, Z_rp, 1,
Yrl, Yax, Zrp_, 1,
Yrl, Yml, Zr_m, 1,
Yml, Yrl, Zm_r, 1,
0
@ -696,8 +698,8 @@ Optab optab[] =
{ AWAIT, ynone, Px, 0x9b },
{ AWORD, ybyte, Px, 2 },
{ AXCHGB, yml_mb, Pb, 0x86,0x86 },
{ AXCHGL, yml_ml, Px, 0x87,0x87 },
{ AXCHGW, yml_ml, Pe, 0x87,0x87 },
{ AXCHGL, yxchg, Px, 0x90,0x90,0x87,0x87 },
{ AXCHGW, yxchg, Pe, 0x90,0x90,0x87,0x87 },
{ AXLAT, ynone, Px, 0xd7 },
{ AXORB, yxorb, Pb, 0x34,0x80,(06),0x30,0x32 },
{ AXORL, yxorl, Px, 0x83,(06),0x35,0x81,(06),0x31,0x33 },