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cmd/asm,cmd/internal/obj/x86: add RDPID instruction to x86 assembler

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Add support for the Read Processor ID (RDPID) instruction to the x86
assembler. This returns the current logical processor's ID in the
specified register, as a faster alternative to RDTSCP.

Fixes #56525

Change-Id: I43482e42431dfc385ce2e7f6d44b9746b0cc4548
Reviewed-on: https://go-review.googlesource.com/c/go/+/482955
Run-TryBot: Joel Sing <joel@sing.id.au>
Reviewed-by: Keith Randall <khr@golang.org>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@google.com>
This commit is contained in:
Joel Sing 2023-04-07 06:15:59 +10:00
parent 0d82f584c2
commit 05cd6cbb98
7 changed files with 15 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
src/cmd/asm/internal/asm/testdata/386enc.s vendored
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@ -33,5 +33,8 @@ TEXT asmtest(SB),DUPOK|NOSPLIT,$0
PUSHL FS // 0fa0
POPL FS // 0fa1
POPL SS // 17
RDPID AX // f30fc7f8
// End of tests.
RET

4
src/cmd/asm/internal/asm/testdata/amd64enc_extra.s vendored
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@ -1055,5 +1055,9 @@ TEXT asmtest(SB),DUPOK|NOSPLIT,$0
TPAUSE BX // 660faef3
UMONITOR BX // f30faef3
UMWAIT BX // f20faef3
RDPID DX // f30fc7fa
RDPID R11 // f3410fc7fb
// End of tests.
RET

3
src/cmd/asm/internal/asm/testdata/amd64error.s vendored
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@ -144,4 +144,7 @@ TEXT errors(SB),$0
VMOVDQA32.Z Z0, Z1 // ERROR "mask register must be specified for .Z instructions"
VMOVDQA32.Z Z0, K0, Z1 // ERROR "invalid instruction"
VMOVDQA32.Z Z0, K1, Z1 // ok
RDPID (BX) // ERROR "invalid instruction"
RET

1
src/cmd/internal/obj/x86/aenum.go
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@ -747,6 +747,7 @@ const (
ARDGSBASEL
ARDGSBASEQ
ARDMSR
ARDPID
ARDPKRU
ARDPMC
ARDRANDL

1
src/cmd/internal/obj/x86/anames.go
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@ -745,6 +745,7 @@ var Anames = []string{
"RDGSBASEL",
"RDGSBASEQ",
"RDMSR",
"RDPID",
"RDPKRU",
"RDPMC",
"RDRANDL",

3
src/cmd/internal/obj/x86/asm6.go
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@ -775,7 +775,7 @@ var ymshufb = []ytab{
}
// It should never have more than 1 entry,
// because some optab entries you opcode secuences that
// because some optab entries have opcode sequences that
// are longer than 2 bytes (zoffset=2 here),
// ROUNDPD and ROUNDPS and recently added BLENDPD,
// to name a few.
@ -1774,6 +1774,7 @@ var optab =
{ALSSW, ym_rl, Pe, opBytes{0x0f, 0xb2}},
{ALSSL, ym_rl, Px, opBytes{0x0f, 0xb2}},
{ALSSQ, ym_rl, Pw, opBytes{0x0f, 0xb2}},
{ARDPID, yrdrand, Pf3, opBytes{0xc7, 07}},
{ABLENDPD, yxshuf, Pq, opBytes{0x3a, 0x0d, 0}},
{ABLENDPS, yxshuf, Pq, opBytes{0x3a, 0x0c, 0}},

1
src/cmd/internal/obj/x86/obj6.go
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@ -1476,6 +1476,7 @@ var unaryDst = map[obj.As]bool{
ARDFSBASEQ: true,
ARDGSBASEL: true,
ARDGSBASEQ: true,
ARDPID: true,
ARDRANDL: true,
ARDRANDQ: true,
ARDRANDW: true,