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i965/fs: Add a new fs_inst::regs_written function.

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Certain instructions write more than one register.  Texturing, for
example, returns 4 registers.  (We set rlen to 4 even for TXS and float
shadow sampling.)  Some math functions return 2.  Most return 1.

The next commit introduces a use of this function.

Reviewed-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
(cherry picked from commit 8ab02b5118)
This commit is contained in:
Kenneth Graunke 2012-02-14 12:43:21 -08:00
parent ff1d945032
commit 740123fff7
1 changed files with 12 additions and 0 deletions
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12
src/mesa/drivers/dri/i965/brw_fs.h
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@ -286,6 +286,18 @@ public:
offset == inst->offset);
}
int regs_written()
{
if (is_tex())
return 4;
/* The SINCOS and INT_DIV_QUOTIENT_AND_REMAINDER math functions return 2,
* but we don't currently use them...nor do we have an opcode for them.
*/
return 1;
}
bool is_tex()
{
return (opcode == SHADER_OPCODE_TEX ||