- 1 year ago
Translation of CUDA inline asm from GAS to Intel
When translating CUDA inline assembly code from GAS syntax to Intel syntax, you need to make some adjustments in the assembly code structure and mnemonics. Here's a general guideline for translating CUDA inline assembly code:
Register Names:
- GAS Syntax:
$0
,$1
,$2
, ... - Intel Syntax:
eax
,ebx
,ecx
, ...
- GAS Syntax:
Operand Size:
- GAS Syntax: Suffixed with
l
for 32-bit operands andq
for 64-bit operands. - Intel Syntax: Use
dword ptr
for 32-bit operands andqword ptr
for 64-bit operands.
- GAS Syntax: Suffixed with
Addressing Modes:
- GAS Syntax:
$var
,var(%reg)
,var(%reg, %idx, scale)
. - Intel Syntax:
[var]
,[reg]
,[reg + idx*scale]
.
- GAS Syntax:
Instruction Mnemonics:
- GAS Syntax: Mnemonics may differ from Intel syntax.
- Intel Syntax: Use Intel syntax mnemonics.
Operand Ordering:
- GAS Syntax: Operands are specified in the reverse order.
- Intel Syntax: Operands are specified in the correct order.
Here's an example of translating a simple GAS syntax inline assembly to Intel syntax:
GAS Syntax:
casm volatile(
"mov.s %0, %1;"
: "=f"(result)
: "f"(value)
);
Intel Syntax:
casm volatile(
"movss %1, %0;"
: "=x"(result)
: "x"(value)
);
In this example, the mov.s
instruction in GAS syntax is translated to movss
in Intel syntax. The register names are changed from %0
and %1
to "=x"
and "x"
respectively. The "=f"
and "f"
constraints in GAS syntax are changed to "=x"
and "x"
respectively in Intel syntax.
Please note that the translation may require additional modifications depending on the specific instructions, operands, and constraints used in your CUDA inline assembly code. It's recommended to consult the Intel x86 instruction set reference and the CUDA programming guide for more details on the specific instructions and their equivalents in Intel syntax.