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gallivm: Add some notes about other invocation_0_must_be_active usages.

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So that the next person trying to cut down LLVM compile times doesn't trip
over this.

Reviewed-by: Dave Airlie <airlied@redhat.com>
Reviewed-by: Roland Scheidegger <sroland@vmware.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/21142>
This commit is contained in:
Emma Anholt 2023-02-28 12:35:40 -08:00 • committed by Marge Bot
parent 66dff3d39c
commit bb122202b6
1 changed files with 6 additions and 1 deletions
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7
src/gallium/auxiliary/gallivm/lp_bld_nir_soa.c
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@ -930,6 +930,9 @@ static void emit_load_global(struct lp_build_nir_context *bld_base,
res_bld = get_int_bld(bld_base, true, bit_size);
/* Note, we don't use first_active_invocation here, since we aren't
* guaranteed that there is actually an active invocation.
*/
if (offset_is_uniform && invocation_0_must_be_active(bld_base)) {
/* If the offset is uniform, then use the address from invocation 0 to
* load, and broadcast to all invocations.
@ -1418,7 +1421,9 @@ static void emit_store_mem(struct lp_build_nir_context *bld_base,
offset = lp_build_shr_imm(uint_bld, offset, shift_val);
/* If the address is uniform, then just store the value from the first
* channel instead of making LLVM unroll the invocation loop.
* channel instead of making LLVM unroll the invocation loop. Note that we
* don't use first_active_uniform(), since we aren't guaranteed that there is
* actually an active invocation.
*/
if (index_and_offset_are_uniform && invocation_0_must_be_active(bld_base)) {
LLVMValueRef ssbo_limit;