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cmd/asm, math: add s390x floating point test instructions

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Floating point test instructions allow special cases (NaN, ±∞ and
a few other useful properties) to be checked directly.

This CL adds the following instructions to the assembler:
 * LTEBR - load and test (float32)
 * LTDBR - load and test (float64)
 * TCEB  - test data class (float32)
 * TCDB  - test data class (float64)

Note that I have only added immediate versions of the 'test data
class' instructions for now as that's the only case I think the
compiler will use.

Change-Id: I3398aab2b3a758bf909bd158042234030c8af582
Reviewed-on: https://go-review.googlesource.com/104457
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Michael Munday <mike.munday@ibm.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This commit is contained in:
Michael Munday 2018-04-03 15:49:06 +01:00
parent 7dbf9d43f5
commit 32e6461dc6
19 changed files with 71 additions and 32 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
src/cmd/asm/internal/asm/testdata/s390x.s vendored
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@ -304,6 +304,10 @@ TEXT main·foo(SB),DUPOK|NOSPLIT,$16-0 // TEXT main.foo(SB), DUPOK|NOSPLIT, $16-
LPDFR F1, F2 // b3700021
LNDFR F3, F4 // b3710043
CPSDR F5, F6, F7 // b3725076
LTEBR F1, F2 // b3020021
LTDBR F3, F4 // b3120043
TCEB F5, $8 // ed5000080010
TCDB F15, $4095 // edf00fff0011
VL (R15), V1 // e710f0000006
VST V1, (R15) // e710f000000e

4
src/cmd/internal/obj/s390x/a.out.go
View File

@ -318,6 +318,10 @@ const (
AFIEBR
AFIDBR
ACPSDR
ALTEBR
ALTDBR
ATCEB
ATCDB
// move from GPR to FPR and vice versa
ALDGR

4
src/cmd/internal/obj/s390x/anames.go
View File

@ -90,6 +90,10 @@ var Anames = []string{
"FIEBR",
"FIDBR",
"CPSDR",
"LTEBR",
"LTDBR",
"TCEB",
"TCDB",
"LDGR",
"LGDR",
"CEFBRA",

27
src/cmd/internal/obj/s390x/asmz.go
View File

@ -213,6 +213,8 @@ var optab = []Optab{
Optab{ACFEBRA, C_FREG, C_NONE, C_NONE, C_REG, 83, 0},
Optab{AFIEBR, C_SCON, C_FREG, C_NONE, C_FREG, 48, 0},
Optab{ACPSDR, C_FREG, C_FREG, C_NONE, C_FREG, 49, 0},
Optab{ALTDBR, C_FREG, C_NONE, C_NONE, C_FREG, 50, 0},
Optab{ATCDB, C_FREG, C_NONE, C_NONE, C_SCON, 51, 0},
// load symbol address (plus offset)
Optab{AMOVD, C_SYMADDR, C_NONE, C_NONE, C_REG, 19, 0},
@ -994,6 +996,10 @@ func buildop(ctxt *obj.Link) {
opset(AMOVDLE, r)
opset(AMOVDLT, r)
opset(AMOVDNE, r)
case ALTDBR:
opset(ALTEBR, r)
case ATCDB:
opset(ATCEB, r)
case AVL:
opset(AVLLEZB, r)
opset(AVLLEZH, r)
@ -3298,6 +3304,27 @@ func (c *ctxtz) asmout(p *obj.Prog, asm *[]byte) {
case 49: // copysign
zRRF(op_CPSDR, uint32(p.From.Reg), 0, uint32(p.To.Reg), uint32(p.Reg), asm)
case 50: // load and test
var opcode uint32
switch p.As {
case ALTEBR:
opcode = op_LTEBR
case ALTDBR:
opcode = op_LTDBR
}
zRRE(opcode, uint32(p.To.Reg), uint32(p.From.Reg), asm)
case 51: // test data class (immediate only)
var opcode uint32
switch p.As {
case ATCEB:
opcode = op_TCEB
case ATCDB:
opcode = op_TCDB
}
d2 := c.regoff(&p.To)
zRXE(opcode, uint32(p.From.Reg), 0, 0, uint32(d2), 0, asm)
case 67: // fmov $0 freg
var opcode uint32
switch p.As {

2
src/math/acosh_s390x.s
View File

@ -146,7 +146,7 @@ L10:
FMOVD F0, F8
FMOVD 0(R9), F0
FMADD F8, F8, F0
WORD $0xB3120000 //ltdbr %f0,%f0
LTDBR F0, F0
FSQRT F0, F10
L4:
WFADB V10, V8, V0

6
src/math/asinh_s390x.s
View File

@ -84,7 +84,7 @@ L3:
BYTE $0xFF
CMPW R1, R2
BGT L1
WORD $0xB3120000 //ltdbr %f0,%f0
LTDBR F0, F0
FMOVD F0, F10
BLTU L15
L9:
@ -120,13 +120,13 @@ L1:
FMOVD F0, ret+8(FP)
RET
L14:
WORD $0xB3120000 //ltdbr %f0,%f0
LTDBR F0, F0
BLTU L17
FMOVD F0, F10
L4:
FMOVD 192(R9), F2
WFMADB V0, V0, V2, V0
WORD $0xB3120000 //ltdbr %f0,%f0
LTDBR F0, F0
FSQRT F0, F8
L5:
WFADB V8, V10, V0

8
src/math/atan2_s390x.s
View File

@ -212,10 +212,10 @@ L3:
WFMADB V4, V1, V3, V4
BLT L18
BGT L7
WORD $0xB3120022 //ltdbr %f2,%f2
LTDBR F2, F2
BLTU L21
L8:
WORD $0xB3120000 //ltdbr %f0,%f0
LTDBR F0, F0
BLTU L22
L9:
WFCHDBS V2, V0, V0
@ -238,11 +238,11 @@ L1:
RET
L20:
WORD $0xB3120022 //ltdbr %f2,%f2
LTDBR F2, F2
BLTU L23
FMOVD F2, F6
L4:
WORD $0xB3120000 //ltdbr %f0,%f0
LTDBR F0, F0
BLTU L24
FMOVD F0, F4
L5:

2
src/math/cbrt_s390x.s
View File

@ -96,7 +96,7 @@ L1:
RET
L3:
L2:
WORD $0xB3120000 //ltdbr %f0,%f0
LTDBR F0, F0
BEQ L1
FMOVD F0, F2
WORD $0xED209040 //mdb %f2,.L10-.L9(%r9)

2
src/math/cosh_s390x.s
View File

@ -64,7 +64,7 @@ GLOBL coshe6<>+0(SB), RODATA, $8
TEXT ·coshAsm(SB),NOSPLIT,$0-16
FMOVD x+0(FP), F0
MOVD $coshrodataL23<>+0(SB), R9
WORD $0xB3120000 //ltdbr %f0,%f0
LTDBR F0, F0
MOVD $0x4086000000000000, R2
MOVD $0x4086000000000000, R3
BLTU L19

4
src/math/erfc_s390x.s
View File

@ -166,7 +166,7 @@ TEXT ·erfcAsm(SB), NOSPLIT, $0-16
RET
L2:
WORD $0xB3120000 //ltdbr %f0,%f0
LTDBR F0, F0
MOVH $0x0, R4
BLTU L3
FMOVD F0, F1
@ -264,7 +264,7 @@ L1:
FMOVD F2, ret+8(FP)
RET
L3:
WORD $0xB3120000 //ltdbr %f0,%f0
LTDBR F0, F0
BLTU L30
FMOVD 568(R9), F2
WFSDB V0, V2, V0

2
src/math/exp_s390x.s
View File

@ -59,7 +59,7 @@ GLOBL ·exptexp<> + 0(SB), RODATA, $128
TEXT ·expAsm(SB), NOSPLIT, $0-16
FMOVD x+0(FP), F0
MOVD $·exprodataL22<>+0(SB), R5
WORD $0xB3120000 //ltdbr %f0,%f0
LTDBR F0, F0
BLTU L20
FMOVD F0, F2
L2:

2
src/math/expm1_s390x.s
View File

@ -64,7 +64,7 @@ GLOBL ·expm1tab<> + 0(SB), RODATA, $128
TEXT ·expm1Asm(SB), NOSPLIT, $0-16
FMOVD x+0(FP), F0
MOVD $·expm1rodataL22<>+0(SB), R5
WORD $0xB3120000 //ltdbr %f0,%f0
LTDBR F0, F0
BLTU L20
FMOVD F0, F2
L2:

2
src/math/log10_s390x.s
View File

@ -87,7 +87,7 @@ L1:
RET
L2:
WORD $0xB3120000 //ltdbr %f0,%f0
LTDBR F0, F0
BLEU L13
WORD $0xED009080 //mdb %f0,.L20-.L19(%r9)
BYTE $0x00

6
src/math/log_s390x.s
View File

@ -79,7 +79,7 @@ TEXT ·logAsm(SB), NOSPLIT, $0-16
BYTE $0x59
MOVW R1, R7
CMPBGT R7, $22, L17
WORD $0xB3120000 //ltdbr %f0,%f0
LTDBR F0, F0
MOVD $·logx43f<>+0(SB), R1
FMOVD 0(R1), F2
BLEU L3
@ -87,7 +87,7 @@ TEXT ·logAsm(SB), NOSPLIT, $0-16
MOVH $0x8405, R0
BR L15
L7:
WORD $0xB3120000 //ltdbr %f0,%f0
LTDBR F0, F0
BLEU L3
L15:
FMUL F2, F0
@ -161,7 +161,7 @@ L1:
FMOVD F0, ret+8(FP)
RET
L3:
WORD $0xB3120000 //ltdbr %f0,%f0
LTDBR F0, F0
BEQ L20
BGE L1
BVS L1

18
src/math/pow_s390x.s
View File

@ -426,7 +426,7 @@ L1:
FMOVD F1, ret+16(FP)
RET
L43:
WORD $0xB3120000 //ltdbr %f0,%f0
LTDBR F0, F0
BLTU L44
FMOVD F0, F3
L7:
@ -438,7 +438,7 @@ L7:
L8:
WFCEDBS V2, V2, V3
BVS L9
WORD $0xB3120022 //ltdbr %f2,%f2
LTDBR F2, F2
BEQ L26
MOVW R1, R6
CMPBLT R6, $0, L45
@ -469,7 +469,7 @@ L11:
BYTE $0x1C
BR L1
L42:
WORD $0xB3120000 //ltdbr %f0,%f0
LTDBR F0, F0
BLTU L46
FMOVD F0, F4
L3:
@ -534,7 +534,7 @@ L26:
L34:
FMOVD 8(R9), F4
L19:
WORD $0xB3120066 //ltdbr %f6,%f6
LTDBR F6, F6
BLEU L47
L18:
WFMDB V4, V5, V1
@ -552,7 +552,7 @@ L5:
L45:
WFCEDBS V0, V0, V4
BVS L35
WORD $0xB3120000 //ltdbr %f0,%f0
LTDBR F0, F0
BLEU L48
FMOVD 8(R9), F4
L12:
@ -576,7 +576,7 @@ L48:
BYTE $0x59
MOVW R1, R6
CMPBEQ R6, $0, L29
WORD $0xB3120022 //ltdbr %f2,%f2
LTDBR F2, F2
BLTU L50
FMOVD F2, F4
L14:
@ -588,11 +588,11 @@ L14:
FSUB F7, F3
WFCEDBS V4, V3, V3
BEQ L15
WORD $0xB3120000 //ltdbr %f0,%f0
LTDBR F0, F0
FMOVD 8(R9), F4
BNE L16
L13:
WORD $0xB3120022 //ltdbr %f2,%f2
LTDBR F2, F2
BLT L18
L40:
FMOVD $0, F0
@ -615,7 +615,7 @@ L15:
BEQ L32
FMOVD 0(R9), F4
L17:
WORD $0xB3120000 //ltdbr %f0,%f0
LTDBR F0, F0
BNE L12
BR L13
L32:

4
src/math/sin_s390x.s
View File

@ -69,7 +69,7 @@ TEXT ·sinAsm(SB),NOSPLIT,$0-16
FMOVD $(0.0), F1
FCMPU F0, F1
BEQ sinIsZero
WORD $0xB3120000 //ltdbr %f0,%f0
LTDBR F0, F0
BLTU L17
FMOVD F0, F5
L2:
@ -219,7 +219,7 @@ sinIsZero:
TEXT ·cosAsm(SB),NOSPLIT,$0-16
FMOVD x+0(FP), F0
WORD $0xB3120000 //ltdbr %f0,%f0
LTDBR F0, F0
BLTU L35
FMOVD F0, F1
L21:

2
src/math/sinh_s390x.s
View File

@ -69,7 +69,7 @@ TEXT ·sinhAsm(SB),NOSPLIT,$0-16
BGT sinhIsInf
MOVD $sinhrodataL21<>+0(SB), R5
WORD $0xB3120000 //ltdbr %f0,%f0
LTDBR F0, F0
MOVD sinhxinit<>+0(SB), R1
FMOVD F0, F4
MOVD R1, R3

2
src/math/tan_s390x.s
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@ -44,7 +44,7 @@ TEXT ·tanAsm(SB), NOSPLIT, $0-16
BEQ atanIsZero
MOVD $·tanrodataL13<>+0(SB), R5
WORD $0xB3120000 //ltdbr %f0,%f0
LTDBR F0, F0
BLTU L10
FMOVD F0, F2
L2:

2
src/math/tanh_s390x.s
View File

@ -64,7 +64,7 @@ TEXT ·tanhAsm(SB),NOSPLIT,$0-16
FCMPU F0, F1
BEQ tanhIsZero
MOVD $tanhrodataL18<>+0(SB), R5
WORD $0xB3120000 //ltdbr %f0,%f0
LTDBR F0, F0
MOVD $0x4034000000000000, R1
BLTU L15
FMOVD F0, F1