ir3/cf: don't swap signedness of (sat) instructions

Signed and unsigned saturation give different results.

Signed-off-by: Job Noorman <jnoorman@igalia.com>
Fixes: e894e83e47 ("ir3/cf: Rewrite pass")
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/37105>

src/freedreno/ir3/ir3_cf.c

@@ -9,7 +9,8 @@
 #include "ir3_shader.h"
 
 static bool
-is_safe_conv(struct ir3_instruction *instr, type_t src_type, opc_t *src_opc)
+is_safe_conv(struct ir3_instruction *instr, type_t src_type, opc_t *src_opc,
+             struct ir3_instruction *src_instr)
 {
    if (instr->opc != OPC_MOV)
       return false;
@@ -66,6 +67,12 @@ is_safe_conv(struct ir3_instruction *instr, type_t src_type, opc_t *src_opc)
    if (type_size(instr->cat1.dst_type) < type_size(instr->cat1.src_type))
       return true;
 
+   /* Don't swap opcodes when the result is saturated as signed and unsigned
+    * saturation give different results.
+    */
+   if (src_instr->flags & IR3_INSTR_SAT)
+      return false;
+
    /* Try swapping the opcode: */
    bool can_swap = true;
    *src_opc = ir3_try_swap_signedness(*src_opc, &can_swap);
@@ -79,7 +86,7 @@ all_uses_safe_conv(struct ir3_instruction *conv_src, type_t src_type)
    bool first = true;
    foreach_ssa_use (use, conv_src) {
       opc_t new_opc = opc;
-      if (!is_safe_conv(use, src_type, &new_opc))
+      if (!is_safe_conv(use, src_type, &new_opc, conv_src))
          return false;
       /* Check if multiple uses have conflicting requirements on the opcode.
        */