[Qemu-devel] [PATCH 5/8] target-ppc: Bug Fix: mullwo

[Tom Musta]

On 64-bit implementations, the mullwo result is the 64 bit product of
the signed 32 bit operands.  Fix the implementation to properly deposit
the upper 32 bits into the target register.

Signed-off-by: Tom Musta <address@hidden>
---
 target-ppc/translate.c |    9 +++++++++
 1 files changed, 9 insertions(+), 0 deletions(-)

diff --git a/target-ppc/translate.c b/target-ppc/translate.c
index 41a5aea..4904665 100644
--- a/target-ppc/translate.c
+++ b/target-ppc/translate.c
@@ -1148,11 +1148,20 @@ static void gen_mullwo(DisasContext *ctx)
 {
     TCGv_i32 t0 = tcg_temp_new_i32();
     TCGv_i32 t1 = tcg_temp_new_i32();
+#if defined(TARGET_PPC64)
+    TCGv_i64 t2 = tcg_temp_new_i64();
+#endif
 
     tcg_gen_trunc_tl_i32(t0, cpu_gpr[rA(ctx->opcode)]);
     tcg_gen_trunc_tl_i32(t1, cpu_gpr[rB(ctx->opcode)]);
     tcg_gen_muls2_i32(t0, t1, t0, t1);
     tcg_gen_ext_i32_tl(cpu_gpr[rD(ctx->opcode)], t0);
+#if defined(TARGET_PPC64)
+    tcg_gen_ext_i32_tl(t2, t1);
+    tcg_gen_deposit_i64(cpu_gpr[rD(ctx->opcode)],
+                        cpu_gpr[rD(ctx->opcode)], t2, 32, 32);
+    tcg_temp_free(t2);
+#endif
 
     tcg_gen_sari_i32(t0, t0, 31);
     tcg_gen_setcond_i32(TCG_COND_NE, t0, t0, t1);
-- 
1.7.1