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diff cpu_dsl.py @ 2672:6894a25ebfaa

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Fix mulu nflag when compiling with optimization enabled
author Michael Pavone <pavone@retrodev.com>
date Sat, 08 Mar 2025 20:20:23 -0800
parents 38c281ef57b0
children 7e86ec94c899
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line diff
--- a/cpu_dsl.py	Sat Mar 08 19:57:23 2025 -0800
+++ b/cpu_dsl.py	Sat Mar 08 20:20:23 2025 -0800
@@ -883,7 +883,9 @@
 	if p1Size >= size:
 		p1Size = size // 2
 	#TODO: Handle case in which destSize > size
-	return f'\n\t{params[2]} = ((uint{p0Size}_t){params[0]}) * ((uint{p1Size}_t){params[1]});'
+	p0Mask = (1 << p0Size) - 1
+	p1Mask = (1 << p1Size) - 1
+	return f'\n\t{params[2]} = ((uint{size}_t)({params[0]} & {p0Mask})) * ((uint{size}_t)({params[1]} & {p1Mask}));'
 	
 def _getCarryCheck(prog):
 	carryFlag = None