i965/fs: Fix fs_inst::regs_read() for uniform pull constant loads

Previously, fs_inst::regs_read() fell back to depending on the register
width for the second source.  This isn't really correct since it isn't a
SIMD8 value at all, but a SIMD4x2 value.  This commit changes it to
explicitly be always one register.

v2: Use mlen for determining the number of registers read

Reviewed-by: Iago Toral Quiroga <[email protected]>
Acked-by: Francisco Jerez <[email protected]>

1 files changed, 6 insertions, 0 deletions

diff --git a/src/mesa/drivers/dri/i965/brw_fs.cpp b/src/mesa/drivers/dri/i965/brw_fs.cpp
index 94f42949ce2..e83a0923e80 100644
--- a/src/mesa/drivers/dri/i965/brw_fs.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs.cpp
@@ -715,6 +715,12 @@ fs_inst::regs_read(int arg) const
          return mlen;
       break;
 
+   case FS_OPCODE_UNIFORM_PULL_CONSTANT_LOAD_GEN7:
+      /* The payload is actually stored in src1 */
+      if (arg == 1)
+         return mlen;
+      break;
+
    case FS_OPCODE_LINTERP:
       if (arg == 0)
          return exec_size / 4;