_mm_cmp_ss
Classification
Header File
Instruction
VCMPSS xmm, xmm, xmm, imm8
Synopsis
_mm_cmp_ss(__m128 a, __m128 b, const int imm8);
Description
Compare the lower single-precision (32-bit) floating-point element in "a" and "b" based on the comparison operand specified by "imm8", store the result in the lower element of "dst", and copy the upper 3 packed elements from "a" to the upper elements of "dst".
Operation
CASE (imm8[4:0]) OF
0: OP := _CMP_EQ_OQ
1: OP := _CMP_LT_OS
2: OP := _CMP_LE_OS
3: OP := _CMP_UNORD_Q
4: OP := _CMP_NEQ_UQ
5: OP := _CMP_NLT_US
6: OP := _CMP_NLE_US
7: OP := _CMP_ORD_Q
8: OP := _CMP_EQ_UQ
9: OP := _CMP_NGE_US
10: OP := _CMP_NGT_US
11: OP := _CMP_FALSE_OQ
12: OP := _CMP_NEQ_OQ
13: OP := _CMP_GE_OS
14: OP := _CMP_GT_OS
15: OP := _CMP_TRUE_UQ
16: OP := _CMP_EQ_OS
17: OP := _CMP_LT_OQ
18: OP := _CMP_LE_OQ
19: OP := _CMP_UNORD_S
20: OP := _CMP_NEQ_US
21: OP := _CMP_NLT_UQ
22: OP := _CMP_NLE_UQ
23: OP := _CMP_ORD_S
24: OP := _CMP_EQ_US
25: OP := _CMP_NGE_UQ
26: OP := _CMP_NGT_UQ
27: OP := _CMP_FALSE_OS
28: OP := _CMP_NEQ_OS
29: OP := _CMP_GE_OQ
30: OP := _CMP_GT_OQ
31: OP := _CMP_TRUE_US
ESAC
dst[31:0] := ( a[31:0] OP b[31:0] ) ? 0xFFFFFFFF : 0
dst[127:32] := a[127:32]
dst[MAX:128] := 0