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| author | Tom Musta <tommusta@gmail.com> | 2014-08-12 08:45:06 -0500 |
|---|---|---|
| committer | Alexander Graf <agraf@suse.de> | 2014-09-08 12:50:50 +0200 |
| commit | 1fa74845f2bab36bfa37108b9054b53c1b8264b9 (patch) | |
| tree | 08e77f50d8753ad875fa273663d23631a9cc2353 /target-ppc | |
| parent | f11ebbf8d4308795129bc6651cf701b61b812abf (diff) | |
| download | qemu-1fa74845f2bab36bfa37108b9054b53c1b8264b9.zip qemu-1fa74845f2bab36bfa37108b9054b53c1b8264b9.tar.gz qemu-1fa74845f2bab36bfa37108b9054b53c1b8264b9.tar.bz2 | |
target-ppc: Bug Fix: mullw
For 64-bit implementations, the mullw result is the 64 bit product
of the sign-extended least significant 32 bits of the source
registers.
Fix the code to properly sign extend the source operands and produce
a 64 bit product.
Example:
R3 00000000002F37A0
R4 41C33D242F816715
mullw 3,3,4
R3 expected : 0008C3146AE0F020
R3 actual : 000000006AE0F020 (without this patch)
Signed-off-by: Tom Musta <tommusta@gmail.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
Diffstat (limited to 'target-ppc')
| -rw-r--r-- | target-ppc/translate.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/target-ppc/translate.c b/target-ppc/translate.c index dc80b02..b19eb14 100644 --- a/target-ppc/translate.c +++ b/target-ppc/translate.c @@ -1128,9 +1128,20 @@ static void gen_mulhwu(DisasContext *ctx) /* mullw mullw. */ static void gen_mullw(DisasContext *ctx) { +#if defined(TARGET_PPC64) + TCGv_i64 t0, t1; + t0 = tcg_temp_new_i64(); + t1 = tcg_temp_new_i64(); + tcg_gen_ext32s_tl(t0, cpu_gpr[rA(ctx->opcode)]); + tcg_gen_ext32s_tl(t1, cpu_gpr[rB(ctx->opcode)]); + tcg_gen_mul_i64(cpu_gpr[rD(ctx->opcode)], t0, t1); + tcg_temp_free(t0); + tcg_temp_free(t1); +#else tcg_gen_mul_tl(cpu_gpr[rD(ctx->opcode)], cpu_gpr[rA(ctx->opcode)], cpu_gpr[rB(ctx->opcode)]); tcg_gen_ext32s_tl(cpu_gpr[rD(ctx->opcode)], cpu_gpr[rD(ctx->opcode)]); +#endif if (unlikely(Rc(ctx->opcode) != 0)) gen_set_Rc0(ctx, cpu_gpr[rD(ctx->opcode)]); } |