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Merge pull request #3014 from Allofich/idiv

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Allow borderline quotient values in IDIV
This commit is contained in:
Jonathan Campbell
2021-10-29 23:13:35 -07:00
committed by GitHub
parent 3505030b10 7b7ac4211b
commit 7056e83664
2 changed files with 6 additions and 3 deletions
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3
CHANGELOG
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@@ -1,4 +1,7 @@
0.83.19
- Fix IDIV instruction incorrectly raising a divide
error exception for some borderline values. Fixes
Microsoft Flight Simulator. (Allofich)
- Fix horizontal lines in the debugger window being
rendered as unrelated characters in some code
pages. (Allofich)

6
src/cpu/instructions.h
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@@ -700,7 +700,7 @@ extern bool enable_fpu;
Bits quo=((int16_t)reg_ax) / val; \
int8_t rem=(int8_t)((int16_t)reg_ax % val); \
int8_t quo8s=(int8_t)(quo&0xff); \
if (quo!=(int16_t)quo8s) EXCEPTION(0); \
if (quo!=(int16_t)quo8s && quo != 0x80) EXCEPTION(0); \
reg_ah=(uint8_t)rem; \
reg_al=(uint8_t)quo8s; \
FillFlags(); \
@@ -721,7 +721,7 @@ extern bool enable_fpu;
Bits quo=num/val; \
int16_t rem=(int16_t)(num % val); \
int16_t quo16s=(int16_t)quo; \
if (quo!=(int32_t)quo16s) EXCEPTION(0); \
if (quo!=(int32_t)quo16s && quo != 0x8000) EXCEPTION(0); \
reg_dx=(uint16_t)rem; \
reg_ax=(uint16_t)quo16s; \
FillFlags(); \
@@ -741,7 +741,7 @@ extern bool enable_fpu;
int64_t quo=num/val; \
int32_t rem=(int32_t)(num % val); \
int32_t quo32s=(int32_t)(quo&0xffffffff); \
if (quo!=(int64_t)quo32s) EXCEPTION(0); \
if (quo!=(int64_t)quo32s && quo != 0x80000000) EXCEPTION(0); \
reg_edx=(uint32_t)rem; \
reg_eax=(uint32_t)quo32s; \
FillFlags(); \