[Mesa-dev] [PATCH 37/78] i965/nir: Add utility method for comparisons

[Eduardo Lima Mitev]

From: Antia Puentes <apuentes at igalia.com>

This method returns the brw_conditional_mod value used when emitting
comparative ALU operations.

It could be moved to brw_nir in the future to reuse it in fs_nir backend.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=89580
---
 src/mesa/drivers/dri/i965/brw_vec4_nir.cpp | 39 ++++++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)

diff --git a/src/mesa/drivers/dri/i965/brw_vec4_nir.cpp b/src/mesa/drivers/dri/i965/brw_vec4_nir.cpp
index 0743ff1..2f7b5a2 100644
--- a/src/mesa/drivers/dri/i965/brw_vec4_nir.cpp
+++ b/src/mesa/drivers/dri/i965/brw_vec4_nir.cpp
@@ -695,6 +695,45 @@ brw_swizzle_for_nir_swizzle(uint8_t swizzle[4])
    return BRW_SWIZZLE4(swizzle[0], swizzle[1], swizzle[2], swizzle[3]);
 }
 
+static enum brw_conditional_mod
+brw_conditional_for_nir_comparison(nir_op op)
+{
+   switch (op) {
+   case nir_op_flt:
+   case nir_op_ilt:
+   case nir_op_ult:
+      return BRW_CONDITIONAL_L;
+
+   case nir_op_fge:
+   case nir_op_ige:
+   case nir_op_uge:
+      return BRW_CONDITIONAL_GE;
+
+   case nir_op_feq:
+   case nir_op_ieq:
+   case nir_op_ball_fequal2:
+   case nir_op_ball_iequal2:
+   case nir_op_ball_fequal3:
+   case nir_op_ball_iequal3:
+   case nir_op_ball_fequal4:
+   case nir_op_ball_iequal4:
+      return BRW_CONDITIONAL_Z;
+
+   case nir_op_fne:
+   case nir_op_ine:
+   case nir_op_bany_fnequal2:
+   case nir_op_bany_inequal2:
+   case nir_op_bany_fnequal3:
+   case nir_op_bany_inequal3:
+   case nir_op_bany_fnequal4:
+   case nir_op_bany_inequal4:
+      return BRW_CONDITIONAL_NZ;
+
+   default:
+      unreachable("not reached: bad operation for comparison");
+   }
+}
+
 void
 vec4_visitor::nir_emit_alu(nir_alu_instr *instr)
 {
-- 
2.1.4