Intel 64 and IA-32 Architectures Software Developers Manual Volume 1, Basic Architecture

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Vol. 1 E-19

GUIDELINES FOR WRITING SIMD FLOATING-POINT EXCEPTION HANDLERS

Table E-17. #U - Numeric Underflow

Instruction Condition Masked Response

Unmasked Response

and Exception Code

ADDPS

ADDSUBPS

HADDPS

SUBPS

HSUBPS

MULPS

DIVPS

ADDSS

SUBSS

MULSS

DIVSS

CVTPD2PS

CVTSD2SS

Result calculated with

unbounded exponent and

rounded to the

destination precision <

smallest single precision

finite normal value.

res = ±0, denormal, or

normal

#UE = 1 and #PE = 1,

but only if the result is

inexact

res = (result calculated with

unbounded exponent and

rounded to the destination

precision) * 2

192

•#UE = 1

• #PE = 1 if the result is

inexact

ADDPD

ADDSUBPD

HADDPD

SUBPD

HSUBPD

MULPD

DIVPD

ADDSD

SUBSD

MULSD

DIVSD

Result calculated with

unbounded exponent and

rounded to the

destination precision <

smallest double precision

finite normal value.

res = ±0, denormal or

normal

#UE = 1 and #PE = 1,

but only if the result is

inexact

res = (result calculated with

unbounded exponent and

rounded to the destination

precision) * 2

1536

•#UE = 1

• #PE = 1 if the result is

inexact