Changeset 445 in xtideuniversalbios for trunk/Assembly_Library/Inc/Emulate.inc

Timestamp:

Aug 29, 2012, 12:59:23 PM (12 years ago)

Author:

krille_n_@…

google:author:

krille_n_@hotmail.com

Message:

Changes:

• A speed optimization to the eSHL_IM macro for 386 and higher. This change breaks emulation in the sense that the macro will fail when given a memory operand as the first parameter.
• Memory_SumCXbytesFromESSItoAL now returns with the zero flag set/cleared according to the result.
• Unrolled all the 8 bit READ transfer loops to do 16 bytes per iteration. Added a new macro (UNROLL_SECTORS_IN_CX_TO_OWORDS) as part of it. Size wise this is expensive but I think it should be worth the ROM space. The WRITE transfer loops were left as is since writes are rare anyway (<10% of all disk I/O IIRC).
• Minor optimizations and fixes here and there.

File:

• trunk/Assembly_Library/Inc/Emulate.inc (modified) (1 diff)

trunk/Assembly_Library/Inc/Emulate.inc

@@ -465 +465 @@
     eSHIFT_IM   %1, %2, shr
 %endmacro
+
 %macro eSHL_IM 2
+%ifdef USE_386
+    %if %2 = 1
+        add     %1, %1  ; Same size but faster on 386 and 486. Fails if %1 is a memory operand.
+    %else
+        eSHIFT_IM   %1, %2, shl
+    %endif
+%else
     eSHIFT_IM   %1, %2, shl
-%endmacro
+%endif
+%endmacro
+
 %macro eROR_IM 2
     eSHIFT_IM   %1, %2, ror
 %endmacro
+
 %macro eROL_IM 2
     eSHIFT_IM   %1, %2, rol
 %endmacro
+
 %macro eRCR_IM 2
     eSHIFT_IM   %1, %2, rcr
 %endmacro
+
 %macro eRCL_IM 2
     eSHIFT_IM   %1, %2, rcl