3:70
Volume 3: Instruction Reference
fcvt.fx
fcvt.fx — Convert Floating-point to Integer
Format:
(
qp
) fcvt.fx.
sf f
1
=
f
2
signed_form
(
qp
) fcvt.fx.trunc.
sf f
1
=
f
2
signed_form, trunc_form
(
qp
) fcvt.fxu.
sf f
1
=
f
2
unsigned_form
(
qp
) fcvt.fxu.trunc.
sf f
1
=
f
2
unsigned_form, trunc_form
Description:
FR
f
2
is treated as a register format floating-point value and converted to a signed
(signed_form) or unsigned integer (unsigned_form) using either the rounding mode
specified in the FPSR.
sf
.
rc
, or using Round-to-Zero if the trunc_form of the instruction is
used. The result is placed in the 64-bit significand field of FR
f
1
. The exponent field of FR
f
1
is set to the biased exponent for 2.0
63
(0x1003E) and the sign field of FR
f
1
is set to
positive (0). If the result of the conversion cannot be represented as a 64-bit integer,
the 64-bit integer indefinite value 0x8000000000000000 is used as the result, if the
IEEE Invalid Operation Floating-point Exception fault is disabled.
If FR
f
2
is a NaTVal, FR
f
1
is set to NaTVal instead of the computed result.
The mnemonic values for
sf
are given in
.
Operation:
if (PR[
qp
]) {
fp_check_target_register(
f
1
);
if (tmp_isrcode = fp_reg_disabled(
f
1
,
f
2
, 0, 0))
disabled_fp_register_fault(tmp_isrcode, 0);
if (fp_is_natval(FR[
f
2
])) {
FR[
f
1
] = NATVAL;
fp_update_psr(
f
1
);
} else {
tmp_default_result = fcvt_exception_fault_check(
f
2
,
signed_form,
trunc_form,
sf
, &tmp_fp_env);
if (fp_raise_fault(tmp_fp_env))
fp_exception_fault(fp_decode_fault(tmp_fp_env));
if (fp_is_nan(tmp_default_result)) {
FR[
f
1
].significand = INTEGER_INDEFINITE;
FR[
f
1
].exponent = FP_INTEGER_EXP;
FR[
f
1
].sign = FP_SIGN_POSITIVE;
} else {
tmp_res = fp_ieee_rnd_to_int(fp_reg_read(FR[
f
2
]), &tmp_fp_env);
if (tmp_res.exponent)
tmp_res.significand = fp_U64_rsh(
tmp_res.significand, (FP_INTEGER_EXP - tmp_res.exponent));
if (signed_form && tmp_res.sign)
tmp_res.significand = (~tmp_res.significand) + 1;
FR[
f
1
].significand = tmp_res.significand;
FR[
f
1
].exponent = FP_INTEGER_EXP;
FR[
f
1
].sign = FP_SIGN_POSITIVE;
}
fp_update_fpsr(
sf
, tmp_fp_env);
fp_update_psr(
f
1
);
if (fp_raise_traps(tmp_fp_env))
fp_exception_trap(fp_decode_trap(tmp_fp_env));
}
}
Summary of Contents for ITANIUM ARCHITECTURE - SOFTWARE DEVELOPERS VOLUME 3 REV 2.3
Page 1: ......
Page 11: ...x Intel Itanium Architecture Software Developer s Manual Rev 2 3 ...
Page 13: ...1 2 Intel Itanium Architecture Software Developer s Manual Rev 2 3 ...
Page 33: ...1 22 Volume 1 Part 1 Introduction to the Intel Itanium Architecture ...
Page 57: ...1 46 Volume 1 Part 1 Execution Environment ...
Page 147: ...1 136 Intel Itanium Architecture Software Developer s Manual Rev 2 3 ...
Page 149: ...1 138 Volume 1 Part 2 About the Optimization Guide ...
Page 191: ...1 180 Volume 1 Part 2 Predication Control Flow and Instruction Stream ...
Page 230: ......
Page 248: ...236 Intel Itanium Architecture Software Developer s Manual Rev 2 3 ...
Page 250: ...2 2 Intel Itanium Architecture Software Developer s Manual Rev 2 3 ...
Page 264: ...2 16 Volume 2 Part 1 Intel Itanium System Environment ...
Page 380: ...2 132 Volume 2 Part 1 Interruptions ...
Page 398: ...2 150 Volume 2 Part 1 Register Stack Engine ...
Page 486: ...2 238 Volume 2 Part 1 IA 32 Interruption Vector Descriptions ...
Page 750: ...2 502 Intel Itanium Architecture Software Developer s Manual Rev 2 3 ...
Page 754: ...2 506 Volume 2 Part 2 About the System Programmer s Guide ...
Page 796: ...2 548 Volume 2 Part 2 Interruptions and Serialization ...
Page 808: ...2 560 Volume 2 Part 2 Context Management ...
Page 842: ...2 594 Volume 2 Part 2 Floating point System Software ...
Page 850: ...2 602 Volume 2 Part 2 IA 32 Application Support ...
Page 862: ...2 614 Volume 2 Part 2 External Interrupt Architecture ...
Page 870: ...2 622 Volume 2 Part 2 Performance Monitoring Support ...
Page 891: ......
Page 1099: ...3 200 Volume 3 Instruction Reference padd Interruptions Illegal Operation fault ...
Page 1295: ...3 396 Volume 3 Resource and Dependency Semantics ...
Page 1296: ......
Page 1302: ...402 Intel Itanium Architecture Software Developer s Manual Rev 2 3 ...
Page 1494: ...4 192 Volume 4 Base IA 32 Instruction Reference FWAIT Wait See entry for WAIT ...
Page 1647: ...Volume 4 Base IA 32 Instruction Reference 4 345 ROL ROR Rotate See entry for RCL RCR ROL ROR ...
Page 1884: ...4 582 Volume 4 IA 32 SSE Instruction Reference ...
Page 1885: ...Index Intel Itanium Architecture Software Developer s Manual Rev 2 3 Index ...
Page 1886: ...Index Intel Itanium Architecture Software Developer s Manual Rev 2 3 ...
Page 1898: ...INDEX Index 12 Index for Volumes 1 2 3 and 4 ...