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intel/eu/reg: Add a subscript() helper

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This is similar to the identically named fs_reg helper.

Reviewed-by: Iago Toral Quiroga <itoral@igalia.com>
Cc: mesa-stable@lists.freedesktop.org
(cherry picked from commit 10e4feed39)
This commit is contained in:
Jason Ekstrand 2017-10-17 19:50:36 -07:00 • committed by Emil Velikov
parent d1060ba31f
commit b9ddb51c19
1 changed files with 16 additions and 0 deletions
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16
src/intel/compiler/brw_reg.h
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@ -896,6 +896,22 @@ spread(struct brw_reg reg, unsigned s)
}
}
/**
* Reinterpret each channel of register \p reg as a vector of values of the
* given smaller type and take the i-th subcomponent from each.
*/
static inline struct brw_reg
subscript(struct brw_reg reg, enum brw_reg_type type, unsigned i)
{
if (reg.file == IMM)
return reg;
unsigned scale = type_sz(reg.type) / type_sz(type);
assert(scale >= 1 && i < scale);
return suboffset(retype(spread(reg, scale), type), i);
}
static inline struct brw_reg
vec16(struct brw_reg reg)
{