re-ordered XOR before AND in DMA bounds check

A sample micro-optimization that saves one instruction.
cxd4 · Aug 7, 2019 · 3e30349 · 3e30349
1 parent 2ea5951
commit 3e30349
Showing 1 changed file with 3 additions and 3 deletions.
diff --git a/su.c b/su.c
@@ -1,7 +1,7 @@
 /******************************************************************************\
 * Project:  MSP Simulation Layer for Scalar Unit Operations                    *
 * Authors:  Iconoclast                                                         *
-* Release:  2018.12.18                                                         *
+* Release:  2019.08.06                                                         *
 * License:  CC0 Public Domain Dedication                                       *
 *                                                                              *
 * To the extent possible under law, the author(s) have dedicated all copyright *
@@ -243,7 +243,7 @@ void SP_DMA_READ(void)
         } while (i < length);
     } while (count);
 
-    if ((*CR[0x0] & 0x1000) ^ (offC & 0x1000))
+    if ((*CR[0x0] ^ offC) & 0x1000)
         message("DMA over the DMEM-to-IMEM gap.");
     GET_RCP_REG(SP_DMA_BUSY_REG)  =  0x00000000;
     GET_RCP_REG(SP_STATUS_REG)   &= ~SP_STATUS_DMA_BUSY;
@@ -281,7 +281,7 @@ void SP_DMA_WRITE(void)
         } while (i < length);
     } while (count);
 
-    if ((*CR[0x0] & 0x1000) ^ (offC & 0x1000))
+    if ((*CR[0x0] ^ offC) & 0x1000)
         message("DMA over the DMEM-to-IMEM gap.");
     GET_RCP_REG(SP_DMA_BUSY_REG)  =  0x00000000;
     GET_RCP_REG(SP_STATUS_REG)   &= ~SP_STATUS_DMA_BUSY;