[Mesa-dev] [PATCH 8/9] tgsi: implement micro_imsb() and micro_umsb()

[Maxence Le Doré]

From: Maxence Le Doré <Maxence Le Doré>

---
 src/gallium/auxiliary/tgsi/tgsi_exec.c | 44 ++++++++++++++++++++++++++++++++++
 1 file changed, 44 insertions(+)

diff --git a/src/gallium/auxiliary/tgsi/tgsi_exec.c b/src/gallium/auxiliary/tgsi/tgsi_exec.c
index aa1b140..10bce5e 100644
--- a/src/gallium/auxiliary/tgsi/tgsi_exec.c
+++ b/src/gallium/auxiliary/tgsi/tgsi_exec.c
@@ -350,6 +350,42 @@ micro_mov(union tgsi_exec_channel *dst,
 }
 
 static void
+micro_imsb(union tgsi_exec_channel *dst,
+           const union tgsi_exec_channel *src)
+{
+   int i = 0, j = 0;
+
+   for(i = 0; i < 4; i++) {
+     int x = src->i[i];
+     int mask;
+     int res = -1;
+     if (x < 0)
+       x = ~x;
+     for(j = 0; j < 32; j++) {
+       mask = 0x80000000 >> j;
+       if (x & mask) {
+         res = 31 - j;
+         break;
+       }
+     }
+     dst->i[i] = res;
+   }
+}
+
+static void
+micro_umsb(union tgsi_exec_channel *dst,
+           const union tgsi_exec_channel *src)
+{
+   int i = 0;
+   for(i = 0 ; i < 4 ; i++) {
+     if(src->u[i] == 0)
+       dst->i[i] = -1;
+     else
+       dst->i[i] = util_last_bit(src->u[i]) - 1; /* see u_math.h */
+   }
+}
+
+static void
 micro_popcnt(union tgsi_exec_channel *dst,
              const union tgsi_exec_channel *src)
 {
@@ -4322,6 +4358,10 @@ exec_instruction(
       exec_vector_binary(mach, inst, micro_imin, TGSI_EXEC_DATA_INT, TGSI_EXEC_DATA_INT);
       break;
 
+   case TGSI_OPCODE_IMSB:
+      exec_vector_unary(mach, inst, micro_imsb, TGSI_EXEC_DATA_INT, TGSI_EXEC_DATA_INT);
+      break;
+
    case TGSI_OPCODE_INEG:
       exec_vector_unary(mach, inst, micro_ineg, TGSI_EXEC_DATA_INT, TGSI_EXEC_DATA_INT);
       break;
@@ -4386,6 +4426,10 @@ exec_instruction(
       exec_vector_binary(mach, inst, micro_umul_hi, TGSI_EXEC_DATA_UINT, TGSI_EXEC_DATA_UINT);
       break;
 
+   case TGSI_OPCODE_UMSB:
+      exec_vector_unary(mach, inst, micro_umsb, TGSI_EXEC_DATA_INT, TGSI_EXEC_DATA_UINT);
+      break;
+
    case TGSI_OPCODE_USEQ:
       exec_vector_binary(mach, inst, micro_useq, TGSI_EXEC_DATA_UINT, TGSI_EXEC_DATA_UINT);
       break;
-- 
1.8.5.2