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pan/v13: implement CS udiv
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This will be used for CmdDrawByteCountIndirect on v13, which requires
dividing the byte count by the vertex stride to get the number of
vertices in the draw.

Signed-off-by: Olivia Lee <olivia.lee@collabora.com>
Reviewed-by: Christoph Pillmayer <christoph.pillmayer@arm.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/41655>
This commit is contained in:
Olivia Lee 2026-01-23 01:10:41 -08:00 • committed by Marge Bot
parent ab34d3af23
commit f1c30d65e1
1 changed files with 42 additions and 0 deletions
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42
src/panfrost/genxml/cs_builder.h
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@ -13,6 +13,7 @@
#include "gen_macros.h"
#include "util/bitset.h"
#include "util/fast_idiv_by_const.h"
#include "util/u_dynarray.h"
#ifdef __cplusplus
@ -2051,6 +2052,47 @@ cs_umul64(struct cs_builder *b, struct cs_index dest, struct cs_index src,
}
}
}
/* Needs 4 scratch registers */
static inline void
cs_udiv32(struct cs_builder *b, struct cs_index dest, struct cs_index src,
uint32_t imm, struct cs_index scratch)
{
assert(scratch.size >= 4);
assert(imm != 0);
/* Fast path for power-of-two divisors */
if (util_is_power_of_two_nonzero(imm)) {
cs_rshift_imm_u32(b, dest, src, util_logbase2(imm));
return;
}
struct util_fast_udiv_info info = util_compute_fast_udiv_info(imm, 32, 32);
struct cs_index mul_src = cs_extract64(b, scratch, 0);
struct cs_index mul_src_lo = cs_extract32(b, scratch, 0);
struct cs_index mul_src_hi = cs_extract32(b, scratch, 1);
struct cs_index mul_dest = cs_extract64(b, scratch, 2);
struct cs_index mul_dest_hi = cs_extract32(b, mul_dest, 1);
if (info.pre_shift)
cs_rshift_imm_u32(b, mul_src_lo, src, info.pre_shift);
if (info.increment != 0)
cs_add_imm32(b, mul_src_lo, info.pre_shift ? mul_src_lo : src,
info.increment);
if (!info.pre_shift && !(info.increment != 0))
cs_move_reg32(b, mul_src_lo, src);
cs_move32_to(b, mul_src_hi, 0);
cs_umul64(b, mul_dest, mul_src, info.multiplier);
/* (mul_dest << 32) implemented by taking the high register */
cs_rshift_imm_u32(b, dest, mul_dest_hi, info.post_shift);
}
#endif
static inline void