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pan/bi: Add helper to swizzle a constant

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Instead of open-coding special cases in multiple places, just keep a
canonical version that handles every case.

Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/12026>
This commit is contained in:
Alyssa Rosenzweig 2021-07-26 11:14:05 -04:00 • committed by Marge Bot
parent b55fb073a4
commit ce8e269e60
1 changed files with 34 additions and 0 deletions
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34
src/panfrost/bifrost/compiler.h
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@ -65,6 +65,40 @@ enum bi_swizzle {
BI_SWIZZLE_B0022 = 12, /* for b02 lanes */
};
/* Given a packed i16vec2/i8vec4 constant, apply a swizzle. Useful for constant
* folding and Valhall constant optimization. */
static inline uint32_t
bi_apply_swizzle(uint32_t value, enum bi_swizzle swz)
{
const uint16_t *h = (const uint16_t *) &value;
const uint8_t *b = (const uint8_t *) &value;
#define H(h0, h1) (h[h0] | (h[h1] << 16))
#define B(b0, b1, b2, b3) (b[b0] | (b[b1] << 8) | (b[b2] << 16) | (b[b3] << 24))
switch (swz) {
case BI_SWIZZLE_H00: return H(0, 0);
case BI_SWIZZLE_H01: return H(0, 1);
case BI_SWIZZLE_H10: return H(1, 0);
case BI_SWIZZLE_H11: return H(1, 1);
case BI_SWIZZLE_B0000: return B(0, 0, 0, 0);
case BI_SWIZZLE_B1111: return B(1, 1, 1, 1);
case BI_SWIZZLE_B2222: return B(2, 2, 2, 2);
case BI_SWIZZLE_B3333: return B(3, 3, 3, 3);
case BI_SWIZZLE_B0011: return B(0, 0, 1, 1);
case BI_SWIZZLE_B2233: return B(2, 2, 3, 3);
case BI_SWIZZLE_B1032: return B(1, 0, 3, 2);
case BI_SWIZZLE_B3210: return B(3, 2, 1, 0);
case BI_SWIZZLE_B0022: return B(0, 0, 2, 2);
}
#undef H
#undef B
unreachable("Invalid swizzle");
}
enum bi_index_type {
BI_INDEX_NULL = 0,
BI_INDEX_NORMAL = 1,