diff options
| -rw-r--r-- | src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp b/src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp index eca5d0cb01c..6e48be74852 100644 --- a/src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp +++ b/src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp @@ -1135,6 +1135,13 @@ vec4_visitor::try_emit_mad(ir_expression *ir) bool vec4_visitor::try_emit_b2f_of_compare(ir_expression *ir) { + /* This optimization relies on CMP setting the destination to 0 when + * false. Early hardware only sets the least significant bit, and + * leaves the other bits undefined. So we can't use it. + */ + if (brw->gen < 6) + return false; + ir_expression *const cmp = ir->operands[0]->as_expression(); if (cmp == NULL) |