Intel® Architecture Instruction Set Extensions Programming Reference

Operation
INSTRUCTION SET REFERENCE - FMA
In the operations below, "+", "-", and "*" symbols represent addition, subtraction, and multiplication operations
with infinite precision inputs and outputs (no rounding).
VFMSUB132SS DEST, SRC2, SRC3
DEST[31:0] RoundFPControl_MXCSR(DEST[31:0]*SRC3[31:0] - SRC2[31:0])
DEST[127:32] DEST[127:32]
DEST[VLMAX-1:128] 0
VFMSUB213SS DEST, SRC2, SRC3
DEST[31:0] RoundFPControl_MXCSR(SRC2[31:0]*DEST[31:0] - SRC3[31:0])
DEST[127:32] DEST[127:32]
DEST[VLMAX-1:128] 0
VFMSUB231SS DEST, SRC2, SRC3
DEST[31:0] RoundFPControl_MXCSR(SRC2[31:0]*SRC3[63:0] - DEST[31:0])
DEST[127:32] DEST[127:32]
DEST[VLMAX-1:128] 0
Intel C/C++ Compiler Intrinsic Equivalent
VFMSUB132SS: __m128 _mm_fmsub_ss (__m128 a, __m128 b, __m128 c);
VFMSUB213SS: __m128 _mm_fmsub_ss (__m128 a, __m128 b, __m128 c);
VFMSUB231SS: __m128 _mm_fmsub_ss (__m128 a, __m128 b, __m128 c);
SIMD Floating-Point Exceptions
Overflow, Underflow, Invalid, Precision, Denormal
Other Exceptions
See Exceptions Type 3
Ref. # 319433-014 6-33