(RV64 Only) 32-bit Multiply Instructions

(RV64 Only) 32-bit Multiply Instructions More...

Functions
__STATIC_FORCEINLINE long	__RV_SMBB32 (unsigned long a, unsigned long b)
	SMBB32 (Signed Multiply Bottom Word & Bottom Word) More...
__STATIC_FORCEINLINE long	__RV_SMBT32 (unsigned long a, unsigned long b)
	SMBT32 (Signed Multiply Bottom Word & Top Word) More...
__STATIC_FORCEINLINE long	__RV_SMTT32 (unsigned long a, unsigned long b)
	SMTT32 (Signed Multiply Top Word & Top Word) More...

Detailed Description

(RV64 Only) 32-bit Multiply Instructions

there is 3 RV64 Only) 32-bit Multiply Instructions

Function Documentation

__RV_SMBB32()

__STATIC_FORCEINLINE long __RV_SMBB32	(	unsigned long	a,
		unsigned long	b
	)

SMBB32 (Signed Multiply Bottom Word & Bottom Word)

Type: DSP (RV64 Only)

Syntax:

SMBB32 Rd, Rs1, Rs2
SMBT32 Rd, Rs1, Rs2
SMTT32 Rd, Rs1, Rs2

Purpose:
Multiply the signed 32-bit element of a register with the signed 32-bit element of another register and write the 64-bit result to a third register.

• SMBB32: bottom*bottom
• SMBT32: bottom*top
• SMTT32: top*top

Description:
For the SMBB32 instruction, it multiplies the bottom 32-bit element of Rs1 with the bottom 32-bit element of Rs2. It is actually an alias of MULSR64 instruction. For the SMBT32 instruction, it multiplies the bottom 32-bit element of Rs1 with the top 32-bit element of Rs2. For the SMTT32 instruction, it multiplies the top 32-bit element of Rs1 with the top 32-bit element of Rs2. The 64-bit multiplication result is written to Rd. The 32-bit contents of Rs1 and Rs2 are treated as signed integers.

Operations:

res = Rs1.W[0] * Rs2.W[0]; // SMBB32 res = Rs1.W[0] * Rs2.w[1]; // SMBT32 res = Rs1.W[1] * Rs2.W[1];
// SMTT32 Rd = res;

Parameters

[in]	a	unsigned long type of value stored in a
[in]	b	unsigned long type of value stored in b

Returns

value stored in long type

Definition at line 16339 of file core_feature_dsp.h.

{
    long result;
    __ASM volatile("smbb32 %0, %1, %2" : "=r"(result) : "r"(a), "r"(b));
    return result;
}

References __ASM.

__RV_SMBT32()

__STATIC_FORCEINLINE long __RV_SMBT32	(	unsigned long	a,
		unsigned long	b
	)

SMBT32 (Signed Multiply Bottom Word & Top Word)

Type: DSP (RV64 Only)

Syntax:

SMBB32 Rd, Rs1, Rs2
SMBT32 Rd, Rs1, Rs2
SMTT32 Rd, Rs1, Rs2

Purpose:
Multiply the signed 32-bit element of a register with the signed 32-bit element of another register and write the 64-bit result to a third register.

• SMBB32: bottom*bottom
• SMBT32: bottom*top
• SMTT32: top*top

Description:
For the SMBB32 instruction, it multiplies the bottom 32-bit element of Rs1 with the bottom 32-bit element of Rs2. It is actually an alias of MULSR64 instruction. For the SMBT32 instruction, it multiplies the bottom 32-bit element of Rs1 with the top 32-bit element of Rs2. For the SMTT32 instruction, it multiplies the top 32-bit element of Rs1 with the top 32-bit element of Rs2. The 64-bit multiplication result is written to Rd. The 32-bit contents of Rs1 and Rs2 are treated as signed integers.

Operations:

res = Rs1.W[0] * Rs2.W[0]; // SMBB32 res = Rs1.W[0] * Rs2.w[1]; // SMBT32 res = Rs1.W[1] * Rs2.W[1];
// SMTT32 Rd = res;

Parameters

[in]	a	unsigned long type of value stored in a
[in]	b	unsigned long type of value stored in b

Returns

value stored in long type

Definition at line 16388 of file core_feature_dsp.h.

{
    long result;
    __ASM volatile("smbt32 %0, %1, %2" : "=r"(result) : "r"(a), "r"(b));
    return result;
}

References __ASM.

__RV_SMTT32()

__STATIC_FORCEINLINE long __RV_SMTT32	(	unsigned long	a,
		unsigned long	b
	)

SMTT32 (Signed Multiply Top Word & Top Word)

Type: DSP (RV64 Only)

Syntax:

SMBB32 Rd, Rs1, Rs2
SMBT32 Rd, Rs1, Rs2
SMTT32 Rd, Rs1, Rs2

Purpose:
Multiply the signed 32-bit element of a register with the signed 32-bit element of another register and write the 64-bit result to a third register.

• SMBB32: bottom*bottom
• SMBT32: bottom*top
• SMTT32: top*top

Description:
For the SMBB32 instruction, it multiplies the bottom 32-bit element of Rs1 with the bottom 32-bit element of Rs2. It is actually an alias of MULSR64 instruction. For the SMBT32 instruction, it multiplies the bottom 32-bit element of Rs1 with the top 32-bit element of Rs2. For the SMTT32 instruction, it multiplies the top 32-bit element of Rs1 with the top 32-bit element of Rs2. The 64-bit multiplication result is written to Rd. The 32-bit contents of Rs1 and Rs2 are treated as signed integers.

Operations:

res = Rs1.W[0] * Rs2.W[0]; // SMBB32 res = Rs1.W[0] * Rs2.w[1]; // SMBT32 res = Rs1.W[1] * Rs2.W[1];
// SMTT32 Rd = res;

Parameters

[in]	a	unsigned long type of value stored in a
[in]	b	unsigned long type of value stored in b

Returns

value stored in long type

Definition at line 16437 of file core_feature_dsp.h.

{
    long result;
    __ASM volatile("smtt32 %0, %1, %2" : "=r"(result) : "r"(a), "r"(b));
    return result;
}

References __ASM.