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Add sqrt() builtin as an IR operation.

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Following a discussion in #dri-devel, I think this makes more sense
than implementing it as RSQ RCP CMP as Mesa did.  The i965 has a
hardware sqrt that should work, and AMD is suppposed to be able to
implement it as RSQ RCP with an alternate floating point mode so that
the 0.0 case is handled like we want.
This commit is contained in:
Eric Anholt
2010-03-27 13:01:51 -07:00
committed by Ian Romanick
parent ddd2e83db2
commit 44d68fd06f
3 changed files with 11 additions and 1 deletions
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builtin_function.cpp
+9 -1
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@@ -84,6 +84,14 @@ generate_rsq(exec_list *instructions,
generate_unop(instructions, declarations, type, ir_unop_rsq);
}
static void
generate_sqrt(exec_list *instructions,
ir_variable **declarations,
const glsl_type *type)
{
generate_unop(instructions, declarations, type, ir_unop_sqrt);
}
static void
generate_abs(exec_list *instructions,
ir_variable **declarations,
@@ -227,7 +235,7 @@ generate_110_functions(glsl_symbol_table *symtab, exec_list *instructions)
make_gentype_function(symtab, instructions, "log", 1, generate_log);
/* FINISHME: exp2() */
/* FINISHME: log2() */
/* FINISHME: sqrt() */
make_gentype_function(symtab, instructions, "sqrt", 1, generate_sqrt);
make_gentype_function(symtab, instructions, "inversesqrt", 1, generate_rsq);
make_gentype_function(symtab, instructions, "abs", 1, generate_abs);
/* FINISHME: sign() */