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Force implicit dependency on previous register version when accessing a partial register. Fixes graphics issues in Windows 95 on Packard Bell PB410A using built-in HT216 video.

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This commit is contained in:
SarahW 2019-04-28 10:04:30 +01:00
commit 16a86adbf8
2 changed files with 7 additions and 2 deletions
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2
src/codegen_reg.c
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@ -191,7 +191,7 @@ void codegen_reg_mark_as_required()
} }
} }
static int reg_is_native_size(ir_reg_t ir_reg) int reg_is_native_size(ir_reg_t ir_reg)
{ {
int native_size = ireg_data[IREG_GET_REG(ir_reg.reg)].native_size; int native_size = ireg_data[IREG_GET_REG(ir_reg.reg)].native_size;
int requested_size = IREG_GET_SIZE(ir_reg.reg); int requested_size = IREG_GET_SIZE(ir_reg.reg);

7
src/codegen_reg.h
View file

@ -343,6 +343,8 @@ static inline ir_reg_t codegen_reg_read(int reg)
return ireg; return ireg;
} }
int reg_is_native_size(ir_reg_t ir_reg);
static inline ir_reg_t codegen_reg_write(int reg, int uop_nr) static inline ir_reg_t codegen_reg_write(int reg, int uop_nr)
{ {
ir_reg_t ireg; ir_reg_t ireg;
@ -357,7 +359,10 @@ static inline ir_reg_t codegen_reg_write(int reg, int uop_nr)
if (IREG_GET_REG(reg) > IREG_EBX && last_version && !reg_version[IREG_GET_REG(reg)][last_version].refcount && if (IREG_GET_REG(reg) > IREG_EBX && last_version && !reg_version[IREG_GET_REG(reg)][last_version].refcount &&
!(reg_version[IREG_GET_REG(reg)][last_version].flags & REG_FLAGS_REQUIRED)) !(reg_version[IREG_GET_REG(reg)][last_version].flags & REG_FLAGS_REQUIRED))
add_to_dead_list(&reg_version[IREG_GET_REG(reg)][last_version], IREG_GET_REG(reg), last_version); {
if (reg_is_native_size(ireg)) /*Non-native size registers have an implicit dependency on the previous version, so don't add to dead list*/
add_to_dead_list(&reg_version[IREG_GET_REG(reg)][last_version], IREG_GET_REG(reg), last_version);
}
reg_last_version[IREG_GET_REG(reg)]++; reg_last_version[IREG_GET_REG(reg)]++;
if (!reg_last_version[IREG_GET_REG(reg)]) if (!reg_last_version[IREG_GET_REG(reg)])