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immediate field
This type of checking should be expanded to cover more instructions...
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These are the defects found and fixed so far. Several more have
been observed; I'm working on them.
- Fixed an error in spe_load_uint() that caused incorrect values to be
loaded if the given unsigned value had the low 18 bits as 0,
and that caused inefficient code to be emitted if the given value
had the high 14 bits as 0.
- Fixed a problem in stencil code generation where optional registers
weren't tracked correctly.
- Fixed a problem that the stencil function NEVER was acting as ALWAYS.
- Fixed several problems that could occur if stenciling were enabled but
depth was disabled.
- Fixed a problem with two-sided stencil writemask handling that could
cause a stencil writemask to not be applied.
- Fixed several state permutations that were incorrectly flagged as
not requiring stencil values to be calculated.
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Used for SIN, COS, EXP2, LOG2, POW instructions. TEX next.
Fixed some bugs in MIN, MAX, DP3, DP4, DPH instructions.
In rtasm code:
Special-case spe_lqd(), spe_stqd() functions so they take byte offsets but
low-order 4 bits are shifted out. This makes things consistant with SPU
assembly language conventions.
Added spe_get_registers_used() function.
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Don't use register qualifier. Doxygen-ize comments. Remove 'extern'.
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This set of code changes are for stencil code generation
support. Both one-sided and two-sided stenciling are supported.
In addition to the raw code generation changes, these changes had
to be made elsewhere in the system:
- Added new "register set" feature to the SPE assembly generation.
A "register set" is a way to allocate multiple registers and free
them all at the same time, delegating register allocation management
to the spe_function unit. It's quite useful in complex register
allocation schemes (like stenciling).
- Added and improved SPE macro calculations.
These are operations between registers and unsigned integer
immediates. In many cases, the calculation can be performed
with a single instruction; the macros will generate the
single instruction if possible, or generate a register load
and register-to-register operation if not. These macro
functions are: spe_load_uint() (which has new ways to
load a value in a single instruction), spe_and_uint(),
spe_xor_uint(), spe_compare_equal_uint(), and spe_compare_greater_uint().
- Added facing to fragment generation. While rendering, the rasterizer
needs to be able to determine front- and back-facing fragments, in order
to correctly apply two-sided stencil. That requires these changes:
- Added front_winding field to the cell_command_render block, so that
the state tracker could communicate to the rasterizer what it
considered to be the front-facing direction.
- Added fragment facing as an input to the fragment function.
- Calculated facing is passed during emit_quad().
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- rtasm_ppc_spe.c, rtasm_ppc_spe.h: added a new macro function
"spe_load_uint" for loading and splatting unsigned integers
in a register; it will use "ila" for values 18 bits or less,
"ilh" for word values that are symmetric across halfwords,
"ilhu" for values that have zeroes in their bottom halfwords,
or "ilhu" followed by "iohl" for general 32-bit values.
Of the 15 color masks of interest, 4 are 18 bits or less,
2 are symmetric across halfwords, 3 are zero in the bottom
halfword, and 6 require two instructions to load.
- cell_gen_fragment.c: added full codegen for logic op and
color mask.
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- Added new "macro" functions spe_float_min() and spe_float_max()
to rtasm_ppc_spe.{ch}. These emit instructions that cause
the minimum or maximum of each element in a vector of floats
to be saved in the destination register.
- Major changes to cell_gen_fragment.c to implement all the blending
modes (except for the mysterious D3D-based PIPE_BLENDFACTOR_SRC1_COLOR,
PIPE_BLENDFACTOR_SRC1_ALPHA, PIPE_BLENDFACTOR_INV_SRC1_COLOR, and
PIPE_BLENDFACTOR_INV_SRC1_ALPHA).
- Some revamping of code in cell_gen_fragment.c: use the new spe_float_min()
and spe_float_max() functions (instead of expanding these calculations
inline via macros); create and use an inline utility function for handling
"optional" register allocation (for the {1,1,1,1} vector, and the
blend color vectors) instead of expanding with macros; use the Float
Multiply and Subtract (fnms) instruction to simplify and optimize many
blending calculations.
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spe_splat()
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Fix incorrect opcode for fsmbi.
Added "macro" functions for loading floats/ints, register complement, zero, move.
Added #defines for return address and stack pointer registers.
Added assertions to check that the instruction buffer doesn't overflow.
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Also, rename p_tile.[ch] to u_tile.[ch]
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THere are 64-bits in a uint64_t, not 128. Duh.
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Move the register allocator to a common location. There is more code
on the way that will make use of this interface.
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Moving files since these are not being used outside gallium.
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