SIMD 16bit Miscellaneous Instructions
 __STATIC_FORCEINLINE unsigned long __RV_CLRS16 (unsigned long a)
 __STATIC_FORCEINLINE unsigned long __RV_CLO16 (unsigned long a)
 __STATIC_FORCEINLINE unsigned long __RV_CLZ16 (unsigned long a)
 __STATIC_FORCEINLINE unsigned long __RV_KABS16 (unsigned long a)
 __STATIC_FORCEINLINE unsigned long __RV_SMAX16 (unsigned long a, unsigned long b)
 __STATIC_FORCEINLINE unsigned long __RV_SMIN16 (unsigned long a, unsigned long b)
 __STATIC_FORCEINLINE unsigned long __RV_UMAX16 (unsigned long a, unsigned long b)
 __STATIC_FORCEINLINE unsigned long __RV_UMIN16 (unsigned long a, unsigned long b)

__RV_SCLIP16(a, b)

__RV_UCLIP16(a, b)
 group NMSIS_Core_DSP_Intrinsic_SIMD_16B_MISC
SIMD 16bit Miscellaneous Instructions.
there are 10 SIMD 16bit Misc instructions.
Defines

__RV_SCLIP16(a, b)
SCLIP16 (SIMD 16bit Signed Clip Value)
Type: SIMD
Syntax:
SCLIP16 Rd, Rs1, imm4u[3:0]
Purpose
:
Limit the 16bit signed integer elements of a register into a signed range simultaneously.
Description
:
This instruction limits the 16bit signed integer elements stored in Rs1 into a signed integer range between 2imm4u1 and 2imm4u, and writes the limited results to Rd. For example, if imm4u is 3, the 16bit input values should be saturated between 7 and 8. If saturation is performed, set OV bit to 1.
Operations:
src = Rs1.H[x]; if (src > (2^imm4u)1) { src = (2^imm4u)1; OV = 1; } else if (src < 2^imm4u) { src = 2^imm4u; OV = 1; } Rd.H[x] = src for RV32: x=1...0, for RV64: x=3...0
 Parameters
a – [in] unsigned long type of value stored in a
b – [in] unsigned int type of value stored in b
 Returns
value stored in unsigned long type

__RV_UCLIP16(a, b)
UCLIP16 (SIMD 16bit Unsigned Clip Value)
Type: SIMD
Syntax:
UCLIP16 Rt, Ra, imm4u
Purpose
:
Limit the 16bit signed elements of a register into an unsigned range simultaneously.
Description
:
This instruction limits the 16bit signed elements stored in Rs1 into an unsigned integer range between 2imm4u1 and 0, and writes the limited results to Rd. For example, if imm4u is 3, the 16bit input values should be saturated between 7 and 0. If saturation is performed, set OV bit to 1.
Operations:
src = Rs1.H[x]; if (src > (2^imm4u)1) { src = (2^imm4u)1; OV = 1; } else if (src < 0) { src = 0; OV = 1; } Rd.H[x] = src; for RV32: x=1...0, for RV64: x=3...0
 Parameters
a – [in] unsigned long type of value stored in a
b – [in] unsigned int type of value stored in b
 Returns
value stored in unsigned long type
Functions
 __STATIC_FORCEINLINE unsigned long __RV_CLRS16 (unsigned long a)
CLRS16 (SIMD 16bit Count Leading Redundant Sign)
Type: SIMD
Syntax:
CLRS16 Rd, Rs1
Purpose
:
Count the number of redundant sign bits of the 16bit elements of a general register.
Description
:
Starting from the bits next to the sign bits of the 16bit elements of Rs1, this instruction counts the number of redundant sign bits and writes the result to the corresponding 16 bit elements of Rd.
Operations:
snum[x] = Rs1.H[x]; cnt[x] = 0; for (i = 14 to 0) { if (snum[x](i) == snum[x](15)) { cnt[x] = cnt[x] + 1; } else { break; } } Rd.H[x] = cnt[x]; for RV32: x=1...0 for RV64: x=3...0
 Parameters
a – [in] unsigned long type of value stored in a
 Returns
value stored in unsigned long type
 __STATIC_FORCEINLINE unsigned long __RV_CLO16 (unsigned long a)
CLO16 (SIMD 16bit Count Leading One)
Type: SIMD
Syntax:
CLO16 Rd, Rs1
Purpose
:
Count the number of leading one bits of the 16bit elements of a general register.
Description
:
Starting from the most significant bits of the 16bit elements of Rs1, this instruction counts the number of leading one bits and writes the results to the corresponding 16bit elements of Rd.
Operations:
snum[x] = Rs1.H[x]; cnt[x] = 0; for (i = 15 to 0) { if (snum[x](i) == 1) { cnt[x] = cnt[x] + 1; } else { break; } } Rd.H[x] = cnt[x]; for RV32: x=1...0 for RV64: x=3...0
 Parameters
a – [in] unsigned long type of value stored in a
 Returns
value stored in unsigned long type
 __STATIC_FORCEINLINE unsigned long __RV_CLZ16 (unsigned long a)
CLZ16 (SIMD 16bit Count Leading Zero)
Type: SIMD
Syntax:
CLZ16 Rd, Rs1
Purpose
:
Count the number of leading zero bits of the 16bit elements of a general register.
Description
:
Starting from the most significant bits of the 16bit elements of Rs1, this instruction counts the number of leading zero bits and writes the results to the corresponding 16bit elements of Rd.
Operations:
snum[x] = Rs1.H[x]; cnt[x] = 0; for (i = 15 to 0) { if (snum[x](i) == 0) { cnt[x] = cnt[x] + 1; } else { break; } } Rd.H[x] = cnt[x]; for RV32: x=1...0 for RV64: x=3...0
 Parameters
a – [in] unsigned long type of value stored in a
 Returns
value stored in unsigned long type
 __STATIC_FORCEINLINE unsigned long __RV_KABS16 (unsigned long a)
KABS16 (SIMD 16bit Saturating Absolute)
Type: SIMD
Syntax:
KABS16 Rd, Rs1
Purpose
:
Get the absolute value of 16bit signed integer elements simultaneously.
Description
:
This instruction calculates the absolute value of 16bit signed integer elements stored in Rs1 and writes the element results to Rd. If the input number is 0x8000, this instruction generates 0x7fff as the output and sets the OV bit to 1.
Operations:
src = Rs1.H[x]; if (src == 0x8000) { src = 0x7fff; OV = 1; } else if (src[15] == 1) src = src; } Rd.H[x] = src; for RV32: x=1...0, for RV64: x=3...0
 Parameters
a – [in] unsigned long type of value stored in a
 Returns
value stored in unsigned long type
 __STATIC_FORCEINLINE unsigned long __RV_SMAX16 (unsigned long a, unsigned long b)
SMAX16 (SIMD 16bit Signed Maximum)
Type: SIMD
Syntax:
SMAX16 Rd, Rs1, Rs2
Purpose
:
Do 16bit signed integer elements finding maximum operations simultaneously.
Description
:
This instruction compares the 16bit signed integer elements in Rs1 with the 16bit signed integer elements in Rs2 and selects the numbers that is greater than the other one. The selected results are written to Rd.
Operations:
Rd.H[x] = (Rs1.H[x] > Rs2.H[x])? Rs1.H[x] : Rs2.H[x]; for RV32: x=1...0, for RV64: x=3...0
 Parameters
a – [in] unsigned long type of value stored in a
b – [in] unsigned long type of value stored in b
 Returns
value stored in unsigned long type
 __STATIC_FORCEINLINE unsigned long __RV_SMIN16 (unsigned long a, unsigned long b)
SMIN16 (SIMD 16bit Signed Minimum)
Type: SIMD
Syntax:
SMIN16 Rd, Rs1, Rs2
Purpose
:
Do 16bit signed integer elements finding minimum operations simultaneously.
Description
:
This instruction compares the 16bit signed integer elements in Rs1 with the 16bit signed integer elements in Rs2 and selects the numbers that is less than the other one. The selected results are written to Rd.
Operations:
Rd.H[x] = (Rs1.H[x] < Rs2.H[x])? Rs1.H[x] : Rs2.H[x]; for RV32: x=1...0, for RV64: x=3...0
 Parameters
a – [in] unsigned long type of value stored in a
b – [in] unsigned long type of value stored in b
 Returns
value stored in unsigned long type
 __STATIC_FORCEINLINE unsigned long __RV_UMAX16 (unsigned long a, unsigned long b)
UMAX16 (SIMD 16bit Unsigned Maximum)
Type: SIMD
Syntax:
UMAX16 Rd, Rs1, Rs2
Purpose
:
Do 16bit unsigned integer elements finding maximum operations simultaneously.
Description
:
This instruction compares the 16bit unsigned integer elements in Rs1 with the 16bit unsigned integer elements in Rs2 and selects the numbers that is greater than the other one. The selected results are written to Rd.
Operations:
Rd.H[x] = (Rs1.H[x] >u Rs2.H[x])? Rs1.H[x] : Rs2.H[x]; for RV32: x=1...0, for RV64: x=3...0
 Parameters
a – [in] unsigned long type of value stored in a
b – [in] unsigned long type of value stored in b
 Returns
value stored in unsigned long type
 __STATIC_FORCEINLINE unsigned long __RV_UMIN16 (unsigned long a, unsigned long b)
UMIN16 (SIMD 16bit Unsigned Minimum)
Type: SIMD
Syntax:
UMIN16 Rd, Rs1, Rs2
Purpose
:
Do 16bit unsigned integer elements finding minimum operations simultaneously.
Description
:
This instruction compares the 16bit unsigned integer elements in Rs1 with the 16bit unsigned integer elements in Rs2 and selects the numbers that is less than the other one. The selected results are written to Rd.
Operations:
Rd.H[x] = (Rs1.H[x] <u Rs2.H[x])? Rs1.H[x] : Rs2.H[x]; for RV32: x=1...0, for RV64: x=3...0
 Parameters
a – [in] unsigned long type of value stored in a
b – [in] unsigned long type of value stored in b
 Returns
value stored in unsigned long type

__RV_SCLIP16(a, b)