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pan/bi: Add bi_half and bi_byte selectors 

Useful for extracting out part of an index, internally implemented via a
subword swizzle.

Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/8215>
This commit is contained in:
Alyssa Rosenzweig 2020-12-21 17:11:36 -05:00
parent 06f52fe0b1
commit 372787020d
1 changed files with 18 additions and 0 deletions
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18
src/panfrost/bifrost/compiler.h
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@ -479,6 +479,24 @@ bi_word(bi_index idx, unsigned component)
return idx;
}
/* Helps construct swizzles */
static inline bi_index
bi_half(bi_index idx, bool upper)
{
assert(idx.swizzle == BI_SWIZZLE_H01);
idx.swizzle = upper ? BI_SWIZZLE_H11 : BI_SWIZZLE_H00;
return idx;
}
static inline bi_index
bi_byte(bi_index idx, unsigned lane)
{
assert(idx.swizzle == BI_SWIZZLE_H01);
assert(lane < 4);
idx.swizzle = BI_SWIZZLE_B0000 + lane;
return idx;
}
static inline bool
bi_is_null(bi_index idx)
{