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Source code

VCVTSH2SI

Convert Low FP16 Value to Signed Integer

stableVMJITAOTinstruction

Encodings

OpcodeInstructionOp/En64-bitCompat/LegacyDescription
EVEX.LLIG.F3.MAP5.W0 2D /rVCVTSH2SI r32, xmm1/m16 {er}AValidv1Convert the low FP16 element in xmm1/m16 to a OR AVX10.1 signed doubleword integer and store the result in r32.
EVEX.LLIG.F3.MAP5.W1 2D /rVCVTSH2SI r64, xmm1/m16 {er}AValidNot encodableConvert the low FP16 element in xmm1/m16 to a OR AVX10.1 signed quadword integer and store the result in r64.

Operand encoding

Each mode is a value of the Op/En column above. It says which field of the encoded instruction carries each operand, in the order they are written, and whether the instruction reads it, writes it or both.

A

  1. modrm.reg escrituraModRM byte, reg field (bits 5-3)
  2. modrm.rm lecturaModRM byte, r/m field (bits 2-0); with the SIB byte and the displacement when the mod field asks for them

Tupla: Scalar

Measured cost

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Description

This instruction converts the low FP16 element in the source operand to a signed integer in the destination general purpose register.

When a conversion is inexact, the value returned is rounded according to the rounding control bits in the MXCSR register or the embedded rounding control bits.

If a converted result exceeds the range limits of signed doubleword integer (in non-64-bit modes or 64-bit mode with REX.W/VEX.W/EVEX.W=0), the floating-point invalid exception is raised, and if this exception is masked, the indefinite integer value 80000000H is returned.

If a converted result exceeds the range limits of signed quadword integer (in 64-bit mode and REX.W/VEX.W/EVEX.W = 1), the floating-point invalid exception is raised, and if this exception is masked, the indefinite integer value 80000000_00000000H is returned.

Operation

VCVTSH2SI dest, src
IF *SRC is a register* and (EVEX.b = 1):

    SET_RM(EVEX.RC)
ELSE:

    SET_RM(MXCSR.RC)

IF 64-mode and OperandSize == 64:
    DEST.qword := Convert_fp16_to_integer64(SRC.fp16[0])

ELSE:
    DEST.dword := Convert_fp16_to_integer32(SRC.fp16[0])

Intel C/C++ compiler intrinsics

VCVTSH2SI int _mm_cvt_roundsh_i32 (__m128h a, int rounding);
VCVTSH2SI __int64 _mm_cvt_roundsh_i64 (__m128h a, int rounding);
VCVTSH2SI int _mm_cvtsh_i32 (__m128h a);
VCVTSH2SI __int64 _mm_cvtsh_i64 (__m128h a);

SIMD Floating-Point Exceptions

Invalid, Precision.

Other Exceptions

EVEX-encoded instructions, see Table 2-50, "Type E3NF Class Exception Conditions."

Sources