Conor McCarthy : vkd3d-shader/dxil: Delete bool not-equal-to-false comparison instructions.

[Alexandre Julliard]

Module: vkd3d
Branch: master
Commit: def87539de122956d9464664a61ef32f3b506bb0
URL:    https://gitlab.winehq.org/wine/vkd3d/-/commit/def87539de122956d9464664a61ef3...

Author: Conor McCarthy 
Date:   Wed Apr 24 12:23:27 2024 +1000

vkd3d-shader/dxil: Delete bool not-equal-to-false comparison instructions.

---

libs/vkd3d-shader/dxil.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/libs/vkd3d-shader/dxil.c b/libs/vkd3d-shader/dxil.c
index ab165910..22fdcf9f 100644
--- a/libs/vkd3d-shader/dxil.c
+++ b/libs/vkd3d-shader/dxil.c
@@ -6726,6 +6726,15 @@ static void sm6_parser_emit_cmp2(struct sm6_parser *sm6, const struct dxil_recor

code = record->operands[i++];

+    /* dxcompiler occasionally emits bool not-equal-to-false, which is a no-op. Bool comparisons
+     * do not otherwise occur, so deleting these avoids the need for backend support. */
+    if (sm6_type_is_bool(type_a) && code == ICMP_NE && sm6_value_is_constant_zero(b))
+    {
+        ins->handler_idx = VKD3DSIH_NOP;
+        *dst = *a;
+        return;
+    }
+
     if ((!is_int && !is_fp) || is_int != (code >= ICMP_EQ))
     {
         FIXME("Invalid operation %"PRIu64" on type class %u.\n", code, type_a->class);