This patch addes the Unsigned Divide Word Extended instructions
which were introduced in Power ISA 2.06B.
Signed-off-by: Tom Musta <tommu...@gmail.com>
---
V2: Eliminating extraneous code in the overflow case per comments
from Richard Henderson. Fixed corner case bug in divweu (check
for (RA) >= (RB)).
V4: Using newly added PPC2_DIVE_ISA206 flag. Converted to helper
per Richard Henderson's review.
target-ppc/helper.h | 1 +
target-ppc/int_helper.c | 31 +++++++++++++++++++++++++++++++
target-ppc/translate.c | 5 +++++
3 files changed, 37 insertions(+), 0 deletions(-)
diff --git a/target-ppc/helper.h b/target-ppc/helper.h
index fea03d9..41025c9 100644
--- a/target-ppc/helper.h
+++ b/target-ppc/helper.h
@@ -34,6 +34,7 @@ DEF_HELPER_3(mulldo, i64, env, i64, i64)
DEF_HELPER_4(divdeu, i64, env, i64, i64, i32)
DEF_HELPER_4(divde, i64, env, i64, i64, i32)
#endif
+DEF_HELPER_4(divweu, tl, env, tl, tl, i32)
DEF_HELPER_FLAGS_1(cntlzw, TCG_CALL_NO_RWG_SE, tl, tl)
DEF_HELPER_FLAGS_1(popcntb, TCG_CALL_NO_RWG_SE, tl, tl)
diff --git a/target-ppc/int_helper.c b/target-ppc/int_helper.c
index 920dba7..45586be 100644
--- a/target-ppc/int_helper.c
+++ b/target-ppc/int_helper.c
@@ -41,6 +41,37 @@ uint64_t helper_mulldo(CPUPPCState *env, uint64_t arg1,
uint64_t arg2)
}
#endif
+target_ulong helper_divweu(CPUPPCState *env, target_ulong ra, target_ulong rb,
+ uint32_t oe)
+{
+ uint64_t rt = 0;
+ int overflow = 0;
+
+ uint64_t dividend = (uint64_t)ra << 32;
+ uint64_t divisor = (uint32_t)rb;
+
+ if (unlikely(divisor == 0)) {
+ overflow = 1;
+ } else {
+ rt = dividend / divisor;
+ overflow = rt > UINT32_MAX;
+ }
+
+ if (unlikely(overflow)) {
+ rt = 0; /* Undefined */
+ }
+
+ if (oe) {
+ if (unlikely(overflow)) {
+ env->so = env->ov = 1;
+ } else {
+ env->ov = 0;
+ }
+ }
+
+ return (target_ulong)rt;
+}
+
#if defined(TARGET_PPC64)
uint64_t helper_divdeu(CPUPPCState *env, uint64_t ra, uint64_t rb, uint32_t oe)
diff --git a/target-ppc/translate.c b/target-ppc/translate.c
index e8ffdfc..a7d3295 100644
--- a/target-ppc/translate.c
+++ b/target-ppc/translate.c
@@ -998,6 +998,9 @@ static void gen_##name(DisasContext *ctx)
\
} \
}
+GEN_DIVE(divweu, divweu, 0);
+GEN_DIVE(divweuo, divweu, 1);
+
#if defined(TARGET_PPC64)
static inline void gen_op_arith_divd(DisasContext *ctx, TCGv ret, TCGv arg1,
TCGv arg2, int sign, int compute_ov)
@@ -9619,6 +9622,8 @@ GEN_INT_ARITH_DIVW(divwu, 0x0E, 0, 0),
GEN_INT_ARITH_DIVW(divwuo, 0x1E, 0, 1),
GEN_INT_ARITH_DIVW(divw, 0x0F, 1, 0),
GEN_INT_ARITH_DIVW(divwo, 0x1F, 1, 1),
+GEN_HANDLER_E(divweu, 0x1F, 0x0B, 0x0C, 0, PPC_NONE, PPC2_DIVE_ISA206),
+GEN_HANDLER_E(divweuo, 0x1F, 0x0B, 0x1C, 0, PPC_NONE, PPC2_DIVE_ISA206),
#if defined(TARGET_PPC64)
#undef GEN_INT_ARITH_DIVD
--
1.7.1
