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i965/gen4: Fix GPU hangs since the program streaming change.

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This was tricky.  We were doing a use-before-initialize of
grf_reg_count, but the value usually got overwritten anyway -- when we
didn't have to do a relocation (typical), or on gen5 when we didn't
have relocations at all.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=38771
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
This commit is contained in:
Eric Anholt 2011-07-08 15:30:48 -07:00
parent 57b57f6d1c
commit d03fdc4cde
1 changed files with 1 additions and 1 deletions
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2
src/mesa/drivers/dri/i965/brw_vs_state.c
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@ -47,6 +47,7 @@ brw_prepare_vs_unit(struct brw_context *brw)
memset(vs, 0, sizeof(*vs));
/* BRW_NEW_PROGRAM_CACHE | CACHE_NEW_VS_PROG */
vs->thread0.grf_reg_count = ALIGN(brw->vs.prog_data->total_grf, 16) / 16 - 1;
vs->thread0.kernel_start_pointer =
brw_program_reloc(brw,
brw->vs.state_offset +
@ -54,7 +55,6 @@ brw_prepare_vs_unit(struct brw_context *brw)
brw->vs.prog_offset +
(vs->thread0.grf_reg_count << 1)) >> 6;
vs->thread0.grf_reg_count = ALIGN(brw->vs.prog_data->total_grf, 16) / 16 - 1;
vs->thread1.floating_point_mode = BRW_FLOATING_POINT_NON_IEEE_754;
/* Choosing multiple program flow means that we may get 2-vertex threads,
* which will have the channel mask for dwords 4-7 enabled in the thread,