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cmd/internal/obj/s390x: add FIDBR and FIEBR instructions

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FIDBR and FIEBR can be used for floating-point to integer rounding.
The relevant functions (Ceil, Floor and Trunc) will be updated
in a future CL.

Change-Id: I5952d67ab29d5ef8923ff1143e17a8d30169d692
Reviewed-on: https://go-review.googlesource.com/27826
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
This commit is contained in:
Michael Munday 2016-08-26 11:28:41 -04:00
parent 266b349b2d
commit d2dd0dfda8
4 changed files with 23 additions and 0 deletions
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2
src/cmd/asm/internal/asm/testdata/s390x.s vendored
View File

@ -178,6 +178,8 @@ TEXT main·foo(SB),7,$16-0 // TEXT main.foo(SB), 7, $16-0
FABS F1, F2 // b3100021
FSQRTS F3, F4 // b3140043
FSQRT F5, F15 // b31500f5
FIEBR $0, F0, F1 // b3570010
FIDBR $7, F2, F3 // b35f7032
VL (R15), V1 // e710f0000006
VST V1, (R15) // e710f000000e

2
src/cmd/internal/obj/s390x/a.out.go
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@ -286,6 +286,8 @@ const (
AFSUBS
AFSQRT
AFSQRTS
AFIEBR
AFIDBR
// convert from int32/int64 to float/float64
ACEFBRA

2
src/cmd/internal/obj/s390x/anames.go
View File

@ -79,6 +79,8 @@ var Anames = []string{
"FSUBS",
"FSQRT",
"FSQRTS",
"FIEBR",
"FIDBR",
"CEFBRA",
"CDFBRA",
"CEGBRA",

17
src/cmd/internal/obj/s390x/asmz.go
View File

@ -191,6 +191,7 @@ var optab = []Optab{
Optab{AFMOVD, C_ZCON, C_NONE, C_NONE, C_FREG, 67, 0},
Optab{ACEFBRA, C_REG, C_NONE, C_NONE, C_FREG, 82, 0},
Optab{ACFEBRA, C_FREG, C_NONE, C_NONE, C_REG, 83, 0},
Optab{AFIEBR, C_SCON, C_FREG, C_NONE, C_FREG, 48, 0},
// load symbol address (plus offset)
Optab{AMOVD, C_SYMADDR, C_NONE, C_NONE, C_REG, 19, 0},
@ -912,6 +913,8 @@ func buildop(ctxt *obj.Link) {
opset(ACLFDBR, r)
opset(ACLGEBR, r)
opset(ACLGDBR, r)
case AFIEBR:
opset(AFIDBR, r)
case ACMPBEQ:
opset(ACMPBGE, r)
opset(ACMPBGT, r)
@ -3205,6 +3208,20 @@ func asmout(ctxt *obj.Link, asm *[]byte) {
zRRE(op_LCGR, uint32(p.To.Reg), uint32(r), asm)
}
case 48: // floating-point round to integer
m3 := vregoff(ctxt, &p.From)
if 0 > m3 || m3 > 7 {
ctxt.Diag("mask (%v) must be in the range [0, 7]", m3)
}
var opcode uint32
switch p.As {
case AFIEBR:
opcode = op_FIEBR
case AFIDBR:
opcode = op_FIDBR
}
zRRF(opcode, uint32(m3), 0, uint32(p.To.Reg), uint32(p.Reg), asm)
case 67: // fmov $0 freg
var opcode uint32
switch p.As {