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XMM registers are not preserved across function calls, and should be flushed & discarded by the recompiler prior to calling external functions. Fixes graphics issues in some games (eg World Cup 98 title/menus).

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This commit is contained in:
SarahW 2019-05-05 14:49:10 +01:00
commit 5e35e48ec7
7 changed files with 135 additions and 98 deletions
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25
src/codegen_backend_x86.c
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@ -36,21 +36,24 @@ void *codegen_mem_store_double;
void *codegen_gpf_rout;
void *codegen_exit_rout;
int codegen_host_reg_list[CODEGEN_HOST_REGS] =
host_reg_def_t codegen_host_reg_list[CODEGEN_HOST_REGS] =
{
REG_EAX,
REG_EBX,
REG_EDX
/*Note: while EAX and EDX are normally volatile registers under x86
calling conventions, the recompiler will explicitly save and restore
them across funcion calls*/
{REG_EAX, 0},
{REG_EBX, 0},
{REG_EDX, 0}
};
int codegen_host_fp_reg_list[CODEGEN_HOST_FP_REGS] =
host_reg_def_t codegen_host_fp_reg_list[CODEGEN_HOST_FP_REGS] =
{
REG_XMM0,
REG_XMM1,
REG_XMM2,
REG_XMM3,
REG_XMM4,
REG_XMM5
{REG_XMM0, HOST_REG_FLAG_VOLATILE},
{REG_XMM1, HOST_REG_FLAG_VOLATILE},
{REG_XMM2, HOST_REG_FLAG_VOLATILE},
{REG_XMM3, HOST_REG_FLAG_VOLATILE},
{REG_XMM4, HOST_REG_FLAG_VOLATILE},
{REG_XMM5, HOST_REG_FLAG_VOLATILE}
};
static void build_load_routine(codeblock_t *block, int size, int is_float)