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drm/radeon: refactor register check loop

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After this patch the register check loop does the same thing as before,
except that now gcc does better job optimizing it: it now sees that
end_reg was already checked against PACKET3_SET_CONTEXT_REG_END and can
optimize REG_SAFE_BM_SIZE comparison out of evergreen_is_safe_reg()
as (PACKET3_SET_CONTEXT_REG_END >> 7) < REG_SAFE_BM_SIZE.

Reviewed-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Grazvydas Ignotas <notasas@gmail.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Grazvydas Ignotas 2015-08-23 03:57:37 +03:00 committed by Alex Deucher
parent e5b69da6ba
commit 7874d3901d
1 changed files with 4 additions and 6 deletions
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10
drivers/gpu/drm/radeon/evergreen_cs.c
View file

@ -2299,11 +2299,10 @@ static int evergreen_packet3_check(struct radeon_cs_parser *p,
DRM_ERROR("bad PACKET3_SET_CONFIG_REG\n");
return -EINVAL;
}
for (i = 0; i < pkt->count; i++) {
reg = start_reg + (4 * i);
for (reg = start_reg, idx++; reg <= end_reg; reg += 4, idx++) {
if (evergreen_is_safe_reg(p, reg))
continue;
r = evergreen_cs_handle_reg(p, reg, idx + 1 + i);
r = evergreen_cs_handle_reg(p, reg, idx);
if (r)
return r;
}
@ -2317,11 +2316,10 @@ static int evergreen_packet3_check(struct radeon_cs_parser *p,
DRM_ERROR("bad PACKET3_SET_CONTEXT_REG\n");
return -EINVAL;
}
for (i = 0; i < pkt->count; i++) {
reg = start_reg + (4 * i);
for (reg = start_reg, idx++; reg <= end_reg; reg += 4, idx++) {
if (evergreen_is_safe_reg(p, reg))
continue;
r = evergreen_cs_handle_reg(p, reg, idx + 1 + i);
r = evergreen_cs_handle_reg(p, reg, idx);
if (r)
return r;
}