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Fix modulus result from MIPS DDIV & avoid overflowing division, 

by Richard Sandiford.


git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@4619 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
ths 2008-05-29 18:23:31 +00:00
parent e30b467893
commit 84774e8ea3
1 changed files with 14 additions and 9 deletions
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23
target-mips/translate.c
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@ -1964,20 +1964,25 @@ static void gen_muldiv (DisasContext *ctx, uint32_t opc,
tcg_gen_brcondi_tl(TCG_COND_EQ, cpu_T[1], 0, l1); tcg_gen_brcondi_tl(TCG_COND_EQ, cpu_T[1], 0, l1);
{ {
int l2 = gen_new_label(); int l2 = gen_new_label();
int l3 = gen_new_label();
tcg_gen_brcondi_tl(TCG_COND_NE, cpu_T[0], 1ULL << 63, l2); tcg_gen_brcondi_tl(TCG_COND_NE, cpu_T[0], 1ULL << 63, l2);
tcg_gen_brcondi_tl(TCG_COND_NE, cpu_T[1], -1ULL, l2); tcg_gen_brcondi_tl(TCG_COND_NE, cpu_T[1], -1ULL, l2);
tcg_gen_div_i64(cpu_T[0], cpu_T[0], cpu_T[1]); {
tcg_gen_movi_tl(cpu_T[1], 0); tcg_gen_movi_tl(cpu_T[1], 0);
tcg_gen_br(l3); gen_store_LO(cpu_T[0], 0);
gen_store_HI(cpu_T[1], 0);
tcg_gen_br(l1);
}
gen_set_label(l2); gen_set_label(l2);
tcg_gen_div_i64(cpu_T[0], cpu_T[0], cpu_T[1]); {
tcg_gen_rem_i64(cpu_T[1], cpu_T[0], cpu_T[1]); TCGv r_tmp1 = tcg_temp_new(TCG_TYPE_I64);
gen_set_label(l3); TCGv r_tmp2 = tcg_temp_new(TCG_TYPE_I64);
gen_store_LO(cpu_T[0], 0); tcg_gen_div_i64(r_tmp1, cpu_T[0], cpu_T[1]);
gen_store_HI(cpu_T[1], 0); tcg_gen_rem_i64(r_tmp2, cpu_T[0], cpu_T[1]);
gen_store_LO(r_tmp1, 0);
gen_store_HI(r_tmp2, 0);
}
} }
gen_set_label(l1); gen_set_label(l1);
} }