From 53d9fee586034b8b99cd71feb9e69173afeb331a Mon Sep 17 00:00:00 2001
From: Bill Currie <bill@taniwha.org>
Date: Fri, 25 Aug 2023 17:20:28 +0900
Subject: [PATCH] [qfcc] Support the extended extend instruction

That... feels odd :)
---
 tools/qfcc/include/expr.h       | 3 ++-
 tools/qfcc/source/expr.c        | 3 ++-
 tools/qfcc/source/expr_binary.c | 2 +-
 tools/qfcc/source/statements.c  | 1 +
 4 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/tools/qfcc/include/expr.h b/tools/qfcc/include/expr.h
index 78d6822d5..e079de644 100644
--- a/tools/qfcc/include/expr.h
+++ b/tools/qfcc/include/expr.h
@@ -277,6 +277,7 @@ typedef struct {
 typedef struct {
 	struct expr_s *src;			///< source expression
 	int         extend;			///< extend mode 0: 0, 1: 1, 2: copy/0 3:-1
+	bool        reverse;		///< reverse resultant vector
 	struct type_s *type;		///< result type;
 } ex_extend_t;
 
@@ -515,7 +516,7 @@ expr_t *new_horizontal_expr (int op, expr_t *vec, struct type_s *type);
 
 expr_t *new_swizzle_expr (expr_t *src, const char *swizzle);
 
-expr_t *new_extend_expr (expr_t *src, struct type_s *type, int ext);
+expr_t *new_extend_expr (expr_t *src, struct type_s *type, int ext, bool rev);
 
 /**	Create a new def reference (non-temporary variable) expression node.
 
diff --git a/tools/qfcc/source/expr.c b/tools/qfcc/source/expr.c
index 19ee5c0a3..44fe3253c 100644
--- a/tools/qfcc/source/expr.c
+++ b/tools/qfcc/source/expr.c
@@ -709,12 +709,13 @@ new_swizzle_expr (expr_t *src, const char *swizzle)
 }
 
 expr_t *
-new_extend_expr (expr_t *src, type_t *type, int ext)
+new_extend_expr (expr_t *src, type_t *type, int ext, bool rev)
 {
 	expr_t     *expr = new_expr ();
 	expr->type = ex_extend;
 	expr->e.extend.src = src;
 	expr->e.extend.extend = ext;
+	expr->e.extend.reverse = rev;
 	expr->e.extend.type = type;
 	return expr;
 }
diff --git a/tools/qfcc/source/expr_binary.c b/tools/qfcc/source/expr_binary.c
index 04cc56a27..4e6434036 100644
--- a/tools/qfcc/source/expr_binary.c
+++ b/tools/qfcc/source/expr_binary.c
@@ -722,7 +722,7 @@ convert_scalar (expr_t *scalar, int op, expr_t *vec)
 		return new_vector_list (scalar);
 	}
 
-	return new_extend_expr (scalar, vec_type, 2);//2 = copy
+	return new_extend_expr (scalar, vec_type, 2, false);//2 = copy
 }
 
 static expr_t *
diff --git a/tools/qfcc/source/statements.c b/tools/qfcc/source/statements.c
index 0d40f7265..fa7649e56 100644
--- a/tools/qfcc/source/statements.c
+++ b/tools/qfcc/source/statements.c
@@ -1845,6 +1845,7 @@ expr_extend (sblock_t *sblock, expr_t *e, operand_t **op)
 	int         ext = mode[src_width - 1][res_width - 1];
 	ext |= (e->e.extend.extend & 3) << 3;
 	ext |= (pr_type_size[res_base->type] - 1) << 5;
+	ext |= e->e.extend.reverse << 6;
 	if (ext < 0 || res_base != src_base) {
 		internal_error (e, "invalid type combination for extend %d %d %d",
 						ext, src_width, res_width);