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cmd/internal/obj/ppc64: support for extended mnemonics of BC 

BGT, BLT, BLE, BGE, BNE, BVS, BVC, and BEQ support by assembler. This will simplify the usage of BC constructs like
BC 12, 30, LR    <=>  BEQ CR7, LR
BC 12, 2, LR     <=>  BEQ CR0, LR
BC 12, 0, target  <=>  BLT CR0, target
BC 12, 2, target  <=>  BEQ CR0, target
BC 12, 5, target  <=>  BGT CR1, target
BC 12, 30, target <=>  BEQ CR7, target
BC 4, 6, target	  <=>  BNE CR1, target
BC 4, 5, target   <=>  BLE CR1, target
code cleanup based on the above additions.

Change-Id: I02fdb212b6fe3f85ce447e05f4d42118c9ce63b5
Cq-Include-Trybots: luci.golang.try:gotip-linux-ppc64_power10,gotip-linux-ppc64_power8,gotip-linux-ppc64le_power8,gotip-linux-ppc64le_power9,gotip-linux-ppc64le_power10
Reviewed-on: https://go-review.googlesource.com/c/go/+/612395
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Paul Murphy <murp@ibm.com>
Reviewed-by: Carlos Amedee <carlos@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
This commit is contained in:
Jayanth Krishnamurthy 2024-09-11 09:44:16 -05:00 committed by Paul Murphy
parent b03b1acfb0
commit fdfb3067a8
5 changed files with 76 additions and 22 deletions
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9
src/cmd/asm/internal/asm/testdata/ppc64.s vendored
View File

@ -508,17 +508,26 @@ TEXT asmtest(SB),DUPOK|NOSPLIT,$0
BEQ 0(PC) // 41820000
BEQ CR1,0(PC) // 41860000
BEQ CR0, LR // 4d820020
BEQ CR7, LR // 4d9e0020
BGE 0(PC) // 40800000
BGE CR2,0(PC) // 40880000
BGE CR6,LR // 4c980020
BGT 4(PC) // 41810010
BGT CR3,4(PC) // 418d0010
BGT CR6, LR // 4d990020
BLE 0(PC) // 40810000
BLE CR4,0(PC) // 40910000
BLE CR6, LR // 4c990020
BLT 0(PC) // 41800000
BLT CR5,0(PC) // 41940000
BNE 0(PC) // 40820000
BNE CR6, LR // 4c9a0020
BLT CR6,0(PC) // 41980000
BLT CR6, LR // 4d980020
BVC 0(PC) // 40830000
BVC CR6, LR // 4c9b0020
BVS CR6, LR // 4d9b0020
BVS 0(PC) // 41830000
JMP 8(PC) // 48000010

45
src/cmd/internal/obj/ppc64/asm9.go
View File

@ -282,6 +282,7 @@ var optabBase = []Optab{
{as: ASYSCALL, a1: C_U15CON, type_: 77, size: 12},
{as: ABEQ, a6: C_BRA, type_: 16, size: 4},
{as: ABEQ, a1: C_CREG, a6: C_BRA, type_: 16, size: 4},
{as: ABEQ, a1: C_CREG, a6: C_LR, type_: 17, size: 4},
{as: ABR, a6: C_BRA, type_: 11, size: 4}, // b label
{as: ABR, a6: C_BRAPIC, type_: 11, size: 8}, // b label; nop
{as: ABR, a6: C_LR, type_: 18, size: 4}, // blr
@ -2819,6 +2820,50 @@ func asmout(c *ctxt9, p *obj.Prog, o *Optab, out *[5]uint32) {
}
o1 = OP_BC(c.opirr(p.As), uint32(a), uint32(r), uint32(v), 0)
case 17:
var bo int32
bi := int(p.Reg)
if p.From.Reg == REG_CR {
c.ctxt.Diag("unrecognized register: expected CR0-CR7\n")
}
bi = int(p.From.Reg&0x7) * 4
bo = BO_BCR
switch p.As {
case ABLT:
bi += BI_LT
case ABGT:
bi += BI_GT
case ABEQ:
bi += BI_EQ
case ABNE:
bo = BO_NOTBCR
bi += BI_EQ
case ABLE:
bo = BO_NOTBCR
bi += BI_GT
case ABGE:
bo = BO_NOTBCR
bi += BI_LT
case ABVS:
bi += BI_FU
case ABVC:
bo = BO_NOTBCR
bi += BI_FU
default:
c.ctxt.Diag("unexpected instruction: expecting BGT, BEQ, BNE, BLE, BGE, BVS, BVC \n%v", p)
}
if oclass(&p.To) == C_LR {
o1 = OPVCC(19, 16, 0, 0)
} else {
c.ctxt.Diag("bad optab entry (17): %d\n%v", p.To.Class, p)
}
o1 = OP_BCR(o1, uint32(bo), uint32(bi))
case 18: /* br/bl (lr/ctr); bc/bcl bo,bi,(lr/ctr) */
var v int32
var bh uint32 = 0

10
src/internal/bytealg/compare_ppc64x.s
View File

@ -61,7 +61,7 @@ TEXT ·Compare<ABIInternal>(SB),NOSPLIT|NOFRAME,$0-56
CMP R3,R6,CR7
ISEL CR0LT,R4,R7,R9
SETB_CR0(R3)
BC $12,30,LR // beqlr cr7
BEQ CR7,LR
BR cmpbody<>(SB)
TEXT runtime·cmpstring<ABIInternal>(SB),NOSPLIT|NOFRAME,$0-40
@ -83,7 +83,7 @@ TEXT runtime·cmpstring<ABIInternal>(SB),NOSPLIT|NOFRAME,$0-40
MOVD R5,R6
MOVD R3,R5
SETB_CR0(R3)
BC $12,30,LR // beqlr cr7
BEQ CR7,LR
BR cmpbody<>(SB)
#ifdef GOARCH_ppc64le
@ -143,7 +143,7 @@ cmp64_loop:
ADD $64,R5,R5 // increment to next 64 bytes of A
ADD $64,R6,R6 // increment to next 64 bytes of B
BDNZ cmp64_loop
BC $12,2,LR // beqlr
BEQ CR0,LR // beqlr
// Finish out tail with minimal overlapped checking.
// Note, 0 tail is handled by beqlr above.
@ -215,7 +215,7 @@ cmp32: // 32 - 63B
VCMPEQUDCC V3,V4,V1
BGE CR6,different
BC $12,2,LR // beqlr
BEQ CR0,LR
ADD R9,R10,R10
LXVD2X (R9)(R5),V3
@ -236,7 +236,7 @@ cmp16: // 16 - 31B
LXVD2X (R0)(R6),V4
VCMPEQUDCC V3,V4,V1
BGE CR6,different
BC $12,2,LR // beqlr
BEQ CR0,LR
LXVD2X (R9)(R5),V3
LXVD2X (R9)(R6),V4

6
src/runtime/memclr_ppc64x.s
View File

@ -19,7 +19,7 @@ check:
SRD $3, R4, R6 // R6: double words to clear
CMP R6, $0, CR1 // CR1[EQ] set if no double words
BC 12, 6, nozerolarge // only single bytes
BEQ CR1, nozerolarge // only single bytes
CMP R4, $512
BLT under512 // special case for < 512
ANDCC $127, R3, R8 // check for 128 alignment of address
@ -104,7 +104,7 @@ lt16gt8:
#endif
nozerolarge:
ANDCC $7, R4, R5 // any remaining bytes
BC 4, 1, LR // ble lr
BLE CR0, LR // ble lr
#ifdef GOPPC64_power10
XXLXOR VS32, VS32, VS32 // clear VS32 (V0)
SLD $56, R5, R7
@ -124,7 +124,7 @@ next2:
ADD $-2, R5
next1:
CMP R5, $0
BC 12, 2, LR // beqlr
BEQ CR0, LR // beqlr
MOVB R0, 0(R3)
RET
#endif

28
src/runtime/memmove_ppc64x.s
View File

@ -60,11 +60,11 @@ mcopy:
SUB SRC, TGT, TMP // dest - src
CMPU TMP, LEN, CR2 // < len?
BC 12, 8, backward // BLT CR2 backward
BLT CR2, backward
// Copying forward if no overlap.
BC 12, 6, checkbytes // BEQ CR1, checkbytes
BEQ CR1, checkbytes
SRDCC $3, DWORDS, OCTWORDS // 64 byte chunks?
MOVD $16, IDX16
BEQ lt64gt8 // < 64 bytes
@ -132,7 +132,7 @@ lt16: // Move 8 bytes if possible
MOVD TMP, 0(TGT)
ADD $8, TGT
checkbytes:
BC 12, 14, LR // BEQ lr
BEQ CR3, LR
#ifdef GOPPC64_power10
SLD $56, BYTES, TMP
LXVL SRC, TMP, V0
@ -157,7 +157,7 @@ lt4: // Move halfword if possible
ADD $2, TGT
lt2: // Move last byte if 1 left
CMP BYTES, $1
BC 12, 0, LR // ble lr
BLT CR0, LR
MOVBZ 0(SRC), TMP
MOVBZ TMP, 0(TGT)
RET
@ -182,7 +182,7 @@ backwardtailloop:
BDNZ backwardtailloop
nobackwardtail:
BC 4, 5, LR // blelr cr1, return if DWORDS == 0
BLE CR1, LR // return if DWORDS == 0
SRDCC $2,DWORDS,QWORDS // Compute number of 32B blocks and compare to 0
BNE backward32setup // If QWORDS != 0, start the 32B copy loop.
@ -190,16 +190,16 @@ backward24:
// DWORDS is a value between 1-3.
CMP DWORDS, $2
MOVD -8(SRC), TMP
MOVD TMP, -8(TGT)
BC 12, 0, LR // bltlr, return if DWORDS == 1
MOVD -8(SRC), TMP
MOVD TMP, -8(TGT)
BLT CR0, LR // return if DWORDS == 1
MOVD -16(SRC), TMP
MOVD TMP, -16(TGT)
BC 12, 2, LR // beqlr, return if DWORDS == 2
MOVD -16(SRC), TMP
MOVD TMP, -16(TGT)
BEQ CR0, LR // return if DWORDS == 2
MOVD -24(SRC), TMP
MOVD TMP, -24(TGT)
MOVD -24(SRC), TMP
MOVD TMP, -24(TGT)
RET
backward32setup:
@ -216,5 +216,5 @@ backward32loop:
STXVD2X VS32, (R0)(TGT) // store 16x2 bytes
STXVD2X VS33, (IDX16)(TGT)
BDNZ backward32loop
BC 12, 2, LR // beqlr, return if DWORDS == 0
BEQ CR0, LR // return if DWORDS == 0
BR backward24