From: Francisco Jerez <currojerez@riseup.net>
Date: Wed, 19 Feb 2014 14:20:27 +0000 (+0100)
Subject: i965/vec4: Add non-mutating helper functions to modify src_reg::swizzle and ::negate.
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=98306e727b8291507ff4fd5dd5c4806f3fed9202;p=mesa.git

i965/vec4: Add non-mutating helper functions to modify src_reg::swizzle and ::negate.

Reviewed-by: Paul Berry <stereotype441@gmail.com>
---

diff --git a/src/mesa/drivers/dri/i965/brw_vec4.h b/src/mesa/drivers/dri/i965/brw_vec4.h
index 3be17d890cf..a592af2f128 100644
--- a/src/mesa/drivers/dri/i965/brw_vec4.h
+++ b/src/mesa/drivers/dri/i965/brw_vec4.h
@@ -148,6 +148,30 @@ offset(src_reg reg, unsigned delta)
    return reg;
 }
 
+/**
+ * Reswizzle a given source register.
+ * \sa brw_swizzle().
+ */
+static inline src_reg
+swizzle(src_reg reg, unsigned swizzle)
+{
+   assert(reg.file != HW_REG);
+   reg.swizzle = BRW_SWIZZLE4(
+      BRW_GET_SWZ(reg.swizzle, BRW_GET_SWZ(swizzle, 0)),
+      BRW_GET_SWZ(reg.swizzle, BRW_GET_SWZ(swizzle, 1)),
+      BRW_GET_SWZ(reg.swizzle, BRW_GET_SWZ(swizzle, 2)),
+      BRW_GET_SWZ(reg.swizzle, BRW_GET_SWZ(swizzle, 3)));
+   return reg;
+}
+
+static inline src_reg
+negate(src_reg reg)
+{
+   assert(reg.file != HW_REG && reg.file != IMM);
+   reg.negate = !reg.negate;
+   return reg;
+}
+
 class dst_reg : public reg
 {
 public: