compiler-warning-level-1-c4556.md

title	description	ms.date	f1_keywords	helpviewer_keywords
Compiler Warning (level 1) C4556	Learn more about: Compiler Warning (level 1) C4556	03/28/2025	C4556	C4556

Compiler Warning (level 1) C4556

value of intrinsic immediate argument 'value' is out of range 'lower_bound - upper_bound'

Remarks

An intrinsic matches a hardware instruction. The hardware instruction has a fixed number of bits to encode the constant. If value is out of range, it will not encode properly. The compiler truncates the extra bits.

Example

The following example generates C4556:

// C4556.cpp
// compile with: /W1
// processor: x86
#include <xmmintrin.h>

int main()
{
    __m64 m = _mm_setzero_si64();
    _m_pextrw(m, 5);   // C4556
    _mm_empty();
}