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glsl: Fix loop bounds detection.

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When analyzing a loop where the loop condition is expressed in the
non-standard order (e.g. "4 > i" instead of "i < 4"), we were
reversing the condition incorrectly, leading to a loop bound that was
off by 1.

Fixes piglit tests {vs,fs}-loop-bounds-unrolled.shader_test.

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Matt Turner <mattst88@gmail.com>
Reviewed-by: Eric Anholt <eric@anholt.net>
This commit is contained in:
Paul Berry
2013-01-07 18:10:30 -08:00
parent 844d14ebee
commit 09df6bb96d
1 changed files with 4 additions and 4 deletions
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src/glsl/loop_controls.cpp
+4 -4
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@@ -222,10 +222,10 @@ loop_control_visitor::visit_leave(ir_loop *ir)
limit = cond->operands[0]->as_constant();
switch (cmp) {
case ir_binop_less: cmp = ir_binop_gequal; break;
case ir_binop_greater: cmp = ir_binop_lequal; break;
case ir_binop_lequal: cmp = ir_binop_greater; break;
case ir_binop_gequal: cmp = ir_binop_less; break;
case ir_binop_less: cmp = ir_binop_greater; break;
case ir_binop_greater: cmp = ir_binop_less; break;
case ir_binop_lequal: cmp = ir_binop_gequal; break;
case ir_binop_gequal: cmp = ir_binop_lequal; break;
default: assert(!"Should not get here.");
}
}