From 6ed726b8fc6210a41fe325591e1428d19f419108 Mon Sep 17 00:00:00 2001
From: José Fonseca <jfonseca@vmware.com>
Date: Thu, 2 Sep 2010 11:32:09 +0100
Subject: gallivm: Pass condition masks as an unsigned bitmask.

Much more convenient than boolean arrays.
---
 src/gallium/auxiliary/gallivm/lp_bld_logic.c | 29 ++++++++++++++++++----------
 1 file changed, 19 insertions(+), 10 deletions(-)

(limited to 'src/gallium/auxiliary/gallivm/lp_bld_logic.c')

diff --git a/src/gallium/auxiliary/gallivm/lp_bld_logic.c b/src/gallium/auxiliary/gallivm/lp_bld_logic.c
index 7d7db3b0d9..db25981491 100644
--- a/src/gallium/auxiliary/gallivm/lp_bld_logic.c
+++ b/src/gallium/auxiliary/gallivm/lp_bld_logic.c
@@ -482,24 +482,30 @@ lp_build_select(struct lp_build_context *bld,
 }
 
 
+/**
+ * Return mask ? a : b;
+ *
+ * mask is a TGSI_WRITEMASK_xxx.
+ */
 LLVMValueRef
 lp_build_select_aos(struct lp_build_context *bld,
+                    unsigned mask,
                     LLVMValueRef a,
-                    LLVMValueRef b,
-                    const boolean cond[4])
+                    LLVMValueRef b)
 {
    const struct lp_type type = bld->type;
    const unsigned n = type.length;
    unsigned i, j;
 
+   assert((mask & ~0xf) == 0);
    assert(lp_check_value(type, a));
    assert(lp_check_value(type, b));
 
    if(a == b)
       return a;
-   if(cond[0] && cond[1] && cond[2] && cond[3])
+   if((mask & 0xf) == 0xf)
       return a;
-   if(!cond[0] && !cond[1] && !cond[2] && !cond[3])
+   if((mask & 0xf) == 0x0)
       return b;
    if(a == bld->undef || b == bld->undef)
       return bld->undef;
@@ -522,7 +528,9 @@ lp_build_select_aos(struct lp_build_context *bld,
 
       for(j = 0; j < n; j += 4)
          for(i = 0; i < 4; ++i)
-            shuffles[j + i] = LLVMConstInt(elem_type, (cond[i] ? 0 : n) + j + i, 0);
+            shuffles[j + i] = LLVMConstInt(elem_type,
+                                           (mask & (1 << i) ? 0 : n) + j + i,
+                                           0);
 
       return LLVMBuildShuffleVector(bld->builder, a, b, LLVMConstVector(shuffles, n), "");
    }
@@ -531,16 +539,17 @@ lp_build_select_aos(struct lp_build_context *bld,
       /* XXX: Unfortunately select of vectors do not work */
       /* Use a select */
       LLVMTypeRef elem_type = LLVMInt1Type();
-      LLVMValueRef cond[LP_MAX_VECTOR_LENGTH];
+      LLVMValueRef cond_vec[LP_MAX_VECTOR_LENGTH];
 
       for(j = 0; j < n; j += 4)
          for(i = 0; i < 4; ++i)
-            cond[j + i] = LLVMConstInt(elem_type, cond[i] ? 1 : 0, 0);
+            cond_vec[j + i] = LLVMConstInt(elem_type,
+                                           mask & (1 << i) ? 1 : 0, 0);
 
-      return LLVMBuildSelect(bld->builder, LLVMConstVector(cond, n), a, b, "");
+      return LLVMBuildSelect(bld->builder, LLVMConstVector(cond_vec, n), a, b, "");
 #else
-      LLVMValueRef mask = lp_build_const_mask_aos(type, cond);
-      return lp_build_select(bld, mask, a, b);
+      LLVMValueRef mask_vec = lp_build_const_mask_aos(type, mask);
+      return lp_build_select(bld, mask_vec, a, b);
 #endif
    }
 }
-- 
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