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target-ppc: fix mtfsb0 and mtfsb1 

Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6032 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
aurel32 2008-12-14 18:40:58 +00:00
parent 7889270acb
commit 6e35d5243c
3 changed files with 26 additions and 4 deletions
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1
target-ppc/helper.h
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@ -58,6 +58,7 @@ DEF_HELPER_0(reset_fpstatus, void)
#endif
DEF_HELPER_2(compute_fprf, i32, i64, i32)
DEF_HELPER_2(store_fpscr, void, i64, i32)
DEF_HELPER_1(fpscr_clrbit, void, i32)
DEF_HELPER_1(fpscr_setbit, void, i32)
DEF_HELPER_1(float64_to_float32, i32, i64)
DEF_HELPER_1(float32_to_float64, i64, i32)

18
target-ppc/op_helper.c
View File

@ -843,6 +843,24 @@ static always_inline void fpscr_set_rounding_mode (void)
set_float_rounding_mode(rnd_type, &env->fp_status);
}
void helper_fpscr_clrbit (uint32_t bit)
{
int prev;
prev = (env->fpscr >> bit) & 1;
env->fpscr &= ~(1 << bit);
if (prev == 1) {
switch (bit) {
case FPSCR_RN1:
case FPSCR_RN:
fpscr_set_rounding_mode();
break;
default:
break;
}
}
}
void helper_fpscr_setbit (uint32_t bit)
{
int prev;

11
target-ppc/translate.c
View File

@ -2355,11 +2355,14 @@ GEN_HANDLER(mtfsb0, 0x3F, 0x06, 0x02, 0x001FF800, PPC_FLOAT)
gen_exception(ctx, POWERPC_EXCP_FPU);
return;
}
crb = 32 - (crbD(ctx->opcode) >> 2);
crb = 31 - crbD(ctx->opcode);
gen_optimize_fprf();
gen_reset_fpstatus();
if (likely(crb != 30 && crb != 29))
tcg_gen_andi_i32(cpu_fpscr, cpu_fpscr, ~(1 << crb));
if (likely(crb != FPSCR_FEX && crb != FPSCR_VX)) {
TCGv_i32 t0 = tcg_const_i32(crb);
gen_helper_fpscr_clrbit(t0);
tcg_temp_free_i32(t0);
}
if (unlikely(Rc(ctx->opcode) != 0)) {
tcg_gen_shri_i32(cpu_crf[1], cpu_fpscr, FPSCR_OX);
}
@ -2374,7 +2377,7 @@ GEN_HANDLER(mtfsb1, 0x3F, 0x06, 0x01, 0x001FF800, PPC_FLOAT)
gen_exception(ctx, POWERPC_EXCP_FPU);
return;
}
crb = 32 - (crbD(ctx->opcode) >> 2);
crb = 31 - crbD(ctx->opcode);
gen_optimize_fprf();
gen_reset_fpstatus();
/* XXX: we pretend we can only do IEEE floating-point computations */