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fix: Zk extension String Causes 'String Index Out of Range' Error #191

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fix: Zk extension String Causes 'String Index Out of Range' Error #191

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15 changes: 10 additions & 5 deletions riscv_config/isa_validator.py
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Original file line number Diff line number Diff line change
Expand Up @@ -52,14 +52,19 @@ def get_extension_list(isa):
for i in range(len(zext_list)-1):
a1 = zext_list[i][1].upper()
a2 = zext_list[i+1][1].upper()
a3 = zext_list[i][2]
a4 = zext_list[i+1][2]
if order_index[a1] > order_index[a2]:
err = True
err_list.append( f"Z extension {zext_list[i]} must occur after {zext_list[i+1]}")
elif a1 == a2 and a3 > a4:
err = True
err_list.append( f"Within the Z{a1.lower()} category extension {zext_list[i]} must occur after {zext_list[i+1]}")
elif a1 == a2:
if (len(zext_list[i]) > 2) and (len(zext_list[i]) == 2):
err = True
err_list.append( f"Within the Z{a1.lower()} category extension {zext_list[i]} must occur after {zext_list[i+1]}")
elif (len(zext_list[i]) > 2) and (len(zext_list[i]) > 2):
a3 = zext_list[i][2]
a4 = zext_list[i+1][2]
if a3 > a4:
err = True
err_list.append( f"Within the Z{a1.lower()} category extension {zext_list[i]} must occur after {zext_list[i+1]}")

if 'I' not in extension_list and 'E' not in extension_list:
err_list.append( 'Either of I or E base extensions need to be present in the ISA string')
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