From 31d2e5b954ece02070555b51c06ee427cf951b1f Mon Sep 17 00:00:00 2001
From: Brian Paul <brian.paul@tungstengraphics.com>
Date: Fri, 12 Sep 2008 11:02:18 -0600
Subject: gallium: use new compare32() function to fix warnings about type
 punning and aliasing

---
 src/gallium/auxiliary/tgsi/tgsi_build.c | 24 ++++++++++++++----------
 1 file changed, 14 insertions(+), 10 deletions(-)

diff --git a/src/gallium/auxiliary/tgsi/tgsi_build.c b/src/gallium/auxiliary/tgsi/tgsi_build.c
index 74614d3688..38fcaf8829 100644
--- a/src/gallium/auxiliary/tgsi/tgsi_build.c
+++ b/src/gallium/auxiliary/tgsi/tgsi_build.c
@@ -793,10 +793,14 @@ tgsi_default_instruction_ext_nv( void )
    return instruction_ext_nv;
 }
 
-union token_u32
+
+/** test for inequality of 32-bit values pointed to by a and b */
+static INLINE boolean
+compare32(const void *a, const void *b)
 {
-   unsigned u32;
-};
+   return *((uint32_t *) a) != *((uint32_t *) b);
+}
+
 
 unsigned
 tgsi_compare_instruction_ext_nv(
@@ -805,7 +809,7 @@ tgsi_compare_instruction_ext_nv(
 {
    a.Padding = b.Padding = 0;
    a.Extended = b.Extended = 0;
-   return ((union token_u32 *) &a)->u32 != ((union token_u32 *) &b)->u32;
+   return compare32(&a, &b);
 }
 
 struct tgsi_instruction_ext_nv
@@ -864,7 +868,7 @@ tgsi_compare_instruction_ext_label(
 {
    a.Padding = b.Padding = 0;
    a.Extended = b.Extended = 0;
-   return ((union token_u32 *) &a)->u32 != ((union token_u32 *) &b)->u32;
+   return compare32(&a, &b);
 }
 
 struct tgsi_instruction_ext_label
@@ -905,7 +909,7 @@ tgsi_compare_instruction_ext_texture(
 {
    a.Padding = b.Padding = 0;
    a.Extended = b.Extended = 0;
-   return ((union token_u32 *) &a)->u32 != ((union token_u32 *) &b)->u32;
+   return compare32(&a, &b);
 }
 
 struct tgsi_instruction_ext_texture
@@ -1027,7 +1031,7 @@ tgsi_compare_src_register_ext_swz(
 {
    a.Padding = b.Padding = 0;
    a.Extended = b.Extended = 0;
-   return ((union token_u32 *) &a)->u32 != ((union token_u32 *) &b)->u32;
+   return compare32(&a, &b);
 }
 
 struct tgsi_src_register_ext_swz
@@ -1095,7 +1099,7 @@ tgsi_compare_src_register_ext_mod(
 {
    a.Padding = b.Padding = 0;
    a.Extended = b.Extended = 0;
-   return ((union token_u32 *) &a)->u32 != ((union token_u32 *) &b)->u32;
+   return compare32(&a, &b);
 }
 
 struct tgsi_src_register_ext_mod
@@ -1241,7 +1245,7 @@ tgsi_compare_dst_register_ext_concode(
 {
    a.Padding = b.Padding = 0;
    a.Extended = b.Extended = 0;
-   return ((union token_u32 *) &a)->u32 != ((union token_u32 *) &b)->u32;
+   return compare32(&a, &b);
 }
 
 struct tgsi_dst_register_ext_concode
@@ -1299,7 +1303,7 @@ tgsi_compare_dst_register_ext_modulate(
 {
    a.Padding = b.Padding = 0;
    a.Extended = b.Extended = 0;
-   return ((union token_u32 *) &a)->u32 != ((union token_u32 *) &b)->u32;
+   return compare32(&a, &b);
 }
 
 struct tgsi_dst_register_ext_modulate
-- 
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