Developer Guide and Reference

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Test Intrinsics

These Intel® Streaming SIMD Extensions (Intel® SSE4) intrinsics perform packed integer 128-bit comparisons. The prototypes for these intrinsics are in the
smmintrin.h
file.
To use these intrinsics, include the
immintrin.h
file as follows:
#include <immintrin.h>
Intrinsic Name
Operation
Corresponding
Intel® SSE4 Instruction
_mm_testz_si128
Checks for all zeros in specified bits of a 128-bit value
PTEST
_mm_testc_si128
Checks for all ones in specified bits of a 128-bit value
PTEST
_mm_testnzc_si128
Checks for at least one '0' and at least one '1' in the specified bits of a 128-bit value
PTEST

_mm_testz_si128

int _mm_testz_si128(__m128i s1, __m128i s2);
Returns '
1
' if the bitwise AND operation on
s1
and
s2
results in all zeros, else returns '
0
'. That is,
_mm_testz_si128 := ( (s1 & s2) == 0 ? 1 : 0 )
This intrinsic checks if the
ZF
flag equals '
1
' as a result of the instruction
PTEST