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i965/fs: Fix off-by-one in saturate propagation.

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ip needs to be initialized to start_ip - 1, since the first thing in the
main loop is ip++. Otherwise we would incorrectly propagate the saturate
from the mov to the mad:

   mad     a, b, c, d
   mov.sat x, a
   add     y, z, a

Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
This commit is contained in:
Matt Turner 2014-04-03 10:35:09 -07:00
parent 20dee82a75
commit 86ae6f477d
1 changed files with 1 additions and 1 deletions
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2
src/mesa/drivers/dri/i965/brw_fs_saturate_propagation.cpp
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@ -32,7 +32,7 @@ static bool
opt_saturate_propagation_local(fs_visitor *v, bblock_t *block)
{
bool progress = false;
int ip = block->start_ip;
int ip = block->start_ip - 1;
for (fs_inst *inst = (fs_inst *)block->start;
inst != block->end->next;