PartialSIMD Miscellaneous Instructions¶

__STATIC_FORCEINLINE unsigned long __RV_CLRS32(unsigned long a)

__STATIC_FORCEINLINE unsigned long __RV_CLO32(unsigned long a)

__STATIC_FORCEINLINE unsigned long __RV_CLZ32(unsigned long a)

__STATIC_FORCEINLINE unsigned long __RV_PBSAD(unsigned long a, unsigned long b)

__STATIC_FORCEINLINE unsigned long __RV_PBSADA(unsigned long t, unsigned long a, unsigned long b)

__RV_SCLIP32
(a, b)¶

__RV_UCLIP32
(a, b)¶

group
NMSIS_Core_DSP_Intrinsic_PART_SIMD_MISC
PartialSIMD Miscellaneous Instructions.
there are 7 PartialSIMD Miscellaneous Instructions
Defines

__RV_SCLIP32
(a, b) SCLIP32 (SIMD 32bit Signed Clip Value)
Type: DSP
Syntax:
SCLIP32 Rd, Rs1, imm5u[4:0]
Purpose:
Limit the 32bit signed integer elements of a register into a signed range simultaneously.
Description:
This instruction limits the 32bit signed integer elements stored in Rs1 into a signed integer range between 2imm5u1 and 2imm5u, and writes the limited results to Rd. For example, if imm5u is 3, the 32bit input values should be saturated between 7 and 8. If saturation is performed, set OV bit to 1.
Operations:
src = Rs1.W[x]; if (src > (2^imm5u)1) { src = (2^imm5u)1; OV = 1; } else if (src < 2^imm5u) { src = 2^imm5u; OV = 1; } Rd.W[x] = src for RV32: x=0, for RV64: x=1...0
 Return
value stored in long type
 Parameters
[in] a
: long type of value stored in a[in] b
: unsigned int type of value stored in b

__RV_UCLIP32
(a, b) UCLIP32 (SIMD 32bit Unsigned Clip Value)
Type: SIMD
Syntax:
UCLIP32 Rd, Rs1, imm5u[4:0]
Purpose:
Limit the 32bit signed integer elements of a register into an unsigned range simultaneously.
Description:
This instruction limits the 32bit signed integer elements stored in Rs1 into an unsigned integer range between 2imm5u1 and 0, and writes the limited results to Rd. For example, if imm5u is 3, the 32bit input values should be saturated between 7 and 0. If saturation is performed, set OV bit to 1.
Operations:
src = Rs1.W[x]; if (src > (2^imm5u)1) { src = (2^imm5u)1; OV = 1; } else if (src < 0) { src = 0; OV = 1; } Rd.W[x] = src for RV32: x=0, for RV64: x=1...0
 Return
value stored in unsigned long type
 Parameters
[in] a
: unsigned long type of value stored in a[in] b
: unsigned int type of value stored in b
Functions

__STATIC_FORCEINLINE unsigned long __RV_CLRS32(unsigned long a)
CLRS32 (SIMD 32bit Count Leading Redundant Sign)
Type: SIMD
Syntax:
CLRS32 Rd, Rs1
Purpose:
Count the number of redundant sign bits of the 32bit elements of a general register.
Description:
Starting from the bits next to the sign bits of the 32bit elements of Rs1, this instruction counts the number of redundant sign bits and writes the result to the corresponding 32 bit elements of Rd.
Operations:
snum[x] = Rs1.W[x]; cnt[x] = 0; for (i = 30 to 0) { if (snum[x](i) == snum[x](31)) { cnt[x] = cnt[x] + 1; } else { break; } } Rd.W[x] = cnt[x]; for RV32: x=0 for RV64: x=1...0
 Return
value stored in unsigned long type
 Parameters
[in] a
: unsigned long type of value stored in a

__STATIC_FORCEINLINE unsigned long __RV_CLO32(unsigned long a)
CLO32 (SIMD 32bit Count Leading One)
Type: SIMD
Syntax:
CLO32 Rd, Rs1
Purpose:
Count the number of leading one bits of the 32bit elements of a general register.
Description:
Starting from the most significant bits of the 32bit elements of Rs1, this instruction counts the number of leading one bits and writes the results to the corresponding 32bit elements of Rd.
Operations:
snum[x] = Rs1.W[x]; cnt[x] = 0; for (i = 31 to 0) { if (snum[x](i) == 1) { cnt[x] = cnt[x] + 1; } else { break; } } Rd.W[x] = cnt[x]; for RV32: x=0 for RV64: x=1...0
 Return
value stored in unsigned long type
 Parameters
[in] a
: unsigned long type of value stored in a

__STATIC_FORCEINLINE unsigned long __RV_CLZ32(unsigned long a)
CLZ32 (SIMD 32bit Count Leading Zero)
Type: SIMD
Syntax:
CLZ32 Rd, Rs1
Purpose:
Count the number of leading zero bits of the 32bit elements of a general register.
Description:
Starting from the most significant bits of the 32bit elements of Rs1, this instruction counts the number of leading zero bits and writes the results to the corresponding 32bit elements of Rd.
Operations:
snum[x] = Rs1.W[x]; cnt[x] = 0; for (i = 31 to 0) { if (snum[x](i) == 0) { cnt[x] = cnt[x] + 1; } else { break; } } Rd.W[x] = cnt[x]; for RV32: x=0 for RV64: x=1...0
 Return
value stored in unsigned long type
 Parameters
[in] a
: unsigned long type of value stored in a

__STATIC_FORCEINLINE unsigned long __RV_PBSAD(unsigned long a, unsigned long b)
PBSAD (Parallel Byte Sum of Absolute Difference)
Type: DSP
Syntax:
PBSAD Rd, Rs1, Rs2
Purpose:
Calculate the sum of absolute difference of unsigned 8bit data elements.
Description:
This instruction subtracts the unsigned 8bit elements of Rs2 from those of Rs1. Then it adds the absolute value of each difference together and writes the result to Rd.
Operations:
absdiff[x] = ABS(Rs1.B[x]  Rs2.B[x]); Rd = SUM(absdiff[x]); for RV32: x=3...0, for RV64: x=7...0
 Return
value stored in unsigned long type
 Parameters
[in] a
: unsigned long type of value stored in a[in] b
: unsigned long type of value stored in b

__STATIC_FORCEINLINE unsigned long __RV_PBSADA(unsigned long t, unsigned long a, unsigned long b)
PBSADA (Parallel Byte Sum of Absolute Difference Accum)
Type: DSP
Syntax:
PBSADA Rd, Rs1, Rs2
Purpose:
Calculate the sum of absolute difference of four unsigned 8bit data elements and accumulate it into a register.
Description:
This instruction subtracts the unsigned 8bit elements of Rs2 from those of Rs1. It then adds the absolute value of each difference together along with the content of Rd and writes the accumulated result back to Rd.
Operations:
absdiff[x] = ABS(Rs1.B[x]  Rs2.B[x]); Rd = Rd + SUM(absdiff[x]); for RV32: x=3...0, for RV64: x=7...0
 Return
value stored in unsigned long type
 Parameters
[in] t
: unsigned long type of value stored in t[in] a
: unsigned long type of value stored in a[in] b
: unsigned long type of value stored in b
