Built-In Functions Specific To Particular Target Machines; X86 Built-In Functions - Red Hat ENTERPRISE LINUX 4 Manual

Chapter 6. Extensions to the C Language Family
int
__builtin_clzll
is
unsigned long long
int
__builtin_ctzll
is
unsigned long long
int
__builtin_popcountll
gument type is
unsigned long long
int
__builtin_parityll
ment type is
unsigned long long
6.46. Built-in Functions Specific to Particular Target Machines
On some target machines, GCC supports many built-in functions specific to those machines. Generally
these generate calls to specific machine instructions, but allow the compiler to schedule those calls.

6.46.1. X86 Built-in Functions

These built-in functions are available for the i386 and x86-64 family of computers, depending on the
command-line switches used.
The following machine modes are available for use with MMX built-in functions (Section 6.43 Using
vector instructions through built-in functions):
a vector of four 16-bit integers, and
functions operate on MMX registers as a whole 64-bit entity, these use
If 3Dnow extensions are enabled,
values.
If SSE extensions are enabled,
instructions use a vector of four 32-bit integers, these use
an entire vector register, interpreting it as a 128-bit integer, these use mode
The following built-in functions are made available by
instruction that is part of the name.
v8qi __builtin_ia32_paddb (v8qi, v8qi)
v4hi __builtin_ia32_paddw (v4hi, v4hi)
v2si __builtin_ia32_paddd (v2si, v2si)
v8qi __builtin_ia32_psubb (v8qi, v8qi)
v4hi __builtin_ia32_psubw (v4hi, v4hi)
v2si __builtin_ia32_psubd (v2si, v2si)
v8qi __builtin_ia32_paddsb (v8qi, v8qi)
v4hi __builtin_ia32_paddsw (v4hi, v4hi)
v8qi __builtin_ia32_psubsb (v8qi, v8qi)
v4hi __builtin_ia32_psubsw (v4hi, v4hi)
v8qi __builtin_ia32_paddusb (v8qi, v8qi)
v4hi __builtin_ia32_paddusw (v4hi, v4hi)
v8qi __builtin_ia32_psubusb (v8qi, v8qi)
v4hi __builtin_ia32_psubusw (v4hi, v4hi)
v4hi __builtin_ia32_pmullw (v4hi, v4hi)
v4hi __builtin_ia32_pmulhw (v4hi, v4hi)
di __builtin_ia32_pand (di, di)
di __builtin_ia32_pandn (di,di)
di __builtin_ia32_por (di, di)
di __builtin_ia32_pxor (di, di)
v8qi __builtin_ia32_pcmpeqb (v8qi, v8qi)
v4hi __builtin_ia32_pcmpeqw (v4hi, v4hi)
v2si __builtin_ia32_pcmpeqd (v2si, v2si)
(unsigned long long) Similar to
.
(unsigned long long) Similar to
.
(unsigned long long) Similar to
.
(unsigned long long) Similar to
.
for a vector of eight 8-bit integers. Some of the built-in
V8QI
is used as a mode for a vector of two 32-bit floating point
V2SF
is used for a vector of four 32-bit floating point values. Some
V4SF
__builtin_clz
__builtin_ctz
__builtin_popcount
__builtin_parity
for a vector of two 32-bit integers,
V2SI
. Finally, some instructions operate on
V4SI
. All of them generate the machine
-mmmx
, except the argument type
, except the argument type
, except the ar-
, except the argu-
V4HI
as their mode.
DI
.
TI
215
for