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Diffstat (limited to 'llvm/docs/AMDGPUOperandSyntax.rst')
| -rw-r--r-- | llvm/docs/AMDGPUOperandSyntax.rst | 60 |
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diff --git a/llvm/docs/AMDGPUOperandSyntax.rst b/llvm/docs/AMDGPUOperandSyntax.rst index c20da004729..842f49fbf73 100644 --- a/llvm/docs/AMDGPUOperandSyntax.rst +++ b/llvm/docs/AMDGPUOperandSyntax.rst @@ -102,6 +102,66 @@ Examples: [v[32],v[1:1],[v2]] [v4,v4,v4,v4] +.. _amdgpu_synid_a: + +a +- + +Accumulator registers. There are 256 32-bit accumulator registers. + +A sequence of *accumulator* registers may be used to operate with more than 32 bits of data. + +Assembler currently supports sequences of 1, 2, 4 and 16 *accumulator* registers. + + =================================================== ========================================================= ==================================================================== + Syntax An Alternative Syntax (SP3) Description + =================================================== ========================================================= ==================================================================== + **a**\<N> **acc**\<N> A single 32-bit *accumulator* register. + + *N* must be a decimal + :ref:`integer number<amdgpu_synid_integer_number>`. + **a[**\ <N>\ **]** **acc[**\ <N>\ **]** A single 32-bit *accumulator* register. + + *N* may be specified as an + :ref:`integer number<amdgpu_synid_integer_number>` + or an :ref:`absolute expression<amdgpu_synid_absolute_expression>`. + **a[**\ <N>:<K>\ **]** **acc[**\ <N>:<K>\ **]** A sequence of (\ *K-N+1*\ ) *accumulator* registers. + + *N* and *K* may be specified as + :ref:`integer numbers<amdgpu_synid_integer_number>` + or :ref:`absolute expressions<amdgpu_synid_absolute_expression>`. + **[a**\ <N>, \ **a**\ <N+1>, ... **a**\ <K>\ **]** **[acc**\ <N>, \ **acc**\ <N+1>, ... **acc**\ <K>\ **]** A sequence of (\ *K-N+1*\ ) *accumulator* registers. + + Register indices must be specified as decimal + :ref:`integer numbers<amdgpu_synid_integer_number>`. + =================================================== ========================================================= ==================================================================== + +Note: *N* and *K* must satisfy the following conditions: + +* *N* <= *K*. +* 0 <= *N* <= 255. +* 0 <= *K* <= 255. +* *K-N+1* must be equal to 1, 2, 4 or 16. + +Examples: + +.. parsed-literal:: + + a255 + a[0] + a[0:1] + a[1:1] + a[0:3] + a[2*2] + a[1-1:2-1] + [a252] + [a252,a253,a254,a255] + + acc0 + acc[1] + [acc250] + [acc2,acc3] + .. _amdgpu_synid_s: s |
