SUBPS

Subtract Packed Single-Precision Floating-Point Values

참고 사항

Instruction Operand Encoding

Description

Performs a SIMD subtract of the packed single-precision floating-point values in the second Source operand from the First Source operand, and stores the packed single-precision floating-point results in the destination operand.

VEX.128 and EVEX.128 encoded versions: The second source operand is an XMM register or an 128-bit memory location. The first source operand and destination operands are XMM registers. Bits (MAXVL-1:128) of the corre-sponding destination register are zeroed.

VEX.256 and EVEX.256 encoded versions: The second source operand is an YMM register or an 256-bit memory location. The first source operand and destination operands are YMM registers. Bits (MAXVL-1:256) of the corre-sponding destination register are zeroed.

EVEX.512 encoded version: The second source operand is a ZMM register, a 512-bit memory location or a 512-bit vector broadcasted from a 32-bit memory location. The first source operand and destination operands are ZMM registers. The destination operand is conditionally updated according to the writemask.

128-bit Legacy SSE version: The second source can be an XMM register or an 128-bit memory location. The desti-nation is not distinct from the first source XMM register and the upper Bits (MAXVL-1:128) of the corresponding register destination are unmodified.

Operation

VSUBPS (EVEX encoded versions) when src2 operand is a vector register

(KL, VL) = (4, 128), (8, 256), (16, 512)
IF (VL = 512) AND (EVEX.b = 1) 
    THEN
          SET_RM(EVEX.RC);
    ELSE 
          SET_RM(MXCSR.RM);
FI;
FOR j <-  0 TO KL-1
    i <-  j * 32
    IF k1[j] OR *no writemask*
          THEN DEST[i+31:i] <-  SRC1[i+31:i] - SRC2[i+31:i]
    ELSE 
          IF *merging-masking* ; merging-masking
                THEN *DEST[31:0] remains unchanged*
                ELSE  ; zeroing-masking
                      DEST[31:0] <-  0
          FI;
    FI;
ENDFOR;
DEST[MAX_VL-1:VL] <-  0

VSUBPS (EVEX encoded versions) when src2 operand is a memory source

(KL, VL) = (4, 128), (8, 256),(16, 512)
FOR j <-  0 TO KL-1
    i <- j * 32
    IF k1[j] OR *no writemask* THEN
                IF (EVEX.b = 1)
                      THEN  DEST[i+31:i] <-  SRC1[i+31:i] - SRC2[31:0];
                      ELSE  DEST[i+31:i] <-  SRC1[i+31:i] - SRC2[i+31:i];
                FI;
    ELSE 
          IF *merging-masking* ; merging-masking
                THEN *DEST[31:0] remains unchanged*
                ELSE  ; zeroing-masking
                      DEST[31:0] <-  0
          FI;
    FI;
ENDFOR;
DEST[MAX_VL-1:VL] <-  0

VSUBPS (VEX.256 encoded version)

DEST[31:0] <-  SRC1[31:0] - SRC2[31:0]
DEST[63:32] <-  SRC1[63:32] - SRC2[63:32]
DEST[95:64] <-  SRC1[95:64] - SRC2[95:64]
DEST[127:96] <-  SRC1[127:96] - SRC2[127:96]
DEST[159:128] <-  SRC1[159:128] - SRC2[159:128]
DEST[191:160]<-  SRC1[191:160] - SRC2[191:160]
DEST[223:192] <-  SRC1[223:192] - SRC2[223:192]
DEST[255:224] <-  SRC1[255:224] - SRC2[255:224].
DEST[MAX_VL-1:256] <-  0

VSUBPS (VEX.128 encoded version)

DEST[31:0] <-  SRC1[31:0] - SRC2[31:0]
DEST[63:32] <-  SRC1[63:32] - SRC2[63:32]
DEST[95:64] <-  SRC1[95:64] - SRC2[95:64]
DEST[127:96] <-  SRC1[127:96] - SRC2[127:96]
DEST[MAX_VL-1:128] <-  0

SUBPS (128-bit Legacy SSE version)

DEST[31:0] <-  SRC1[31:0] - SRC2[31:0]
DEST[63:32] <-  SRC1[63:32] - SRC2[63:32]
DEST[95:64] <-  SRC1[95:64] - SRC2[95:64]
DEST[127:96] <-  SRC1[127:96] - SRC2[127:96]
DEST[MAX_VL-1:128] (Unmodified)

Intel C/C++ Compiler Intrinsic Equivalent

VSUBPS __m512 _mm512_sub_ps(__m512 a, __m512 b);
VSUBPS __m512 _mm512_mask_sub_ps(__m512 s, __mmask16 k, __m512 a, __m512 b);
VSUBPS __m512 _mm512_maskz_sub_ps(__mmask16 k, __m512 a, __m512 b);
VSUBPS __m512 _mm512_sub_round_ps(__m512 a, __m512 b, int);
VSUBPS __m512 _mm512_mask_sub_round_ps(__m512 s, __mmask16 k, __m512 a,
                                       __m512 b, int);
VSUBPS __m512 _mm512_maskz_sub_round_ps(__mmask16 k, __m512 a, __m512 b, int);
VSUBPS __m256 _mm256_sub_ps(__m256 a, __m256 b);
VSUBPS __m256 _mm256_mask_sub_ps(__m256 s, __mmask8 k, __m256 a, __m256 b);
VSUBPS __m256 _mm256_maskz_sub_ps(__mmask16 k, __m256 a, __m256 b);
SUBPS __m128 _mm_sub_ps(__m128 a, __m128 b);
VSUBPS __m128 _mm_mask_sub_ps(__m128 s, __mmask8 k, __m128 a, __m128 b);
VSUBPS __m128 _mm_maskz_sub_ps(__mmask16 k, __m128 a, __m128 b);

SIMD Floating-Point Exceptions

Overflow, Underflow, Invalid, Precision, Denormal

Other Exceptions

VEX-encoded instructions, see Exceptions Type 2.

EVEX-encoded instructions, see Exceptions Type E2.

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