OK, so took to reading some of translate to see how well it agrees with
the PPC architecture definition.
I spotted a bug with cmp, which was repeated 4 times. Somebody decided
that NARROW_MODE should affect the handling of cmp instructions, which
is contrary to the ISA documentation.
The first hunk is just a comment about suspicious code. I don't suggest
to apply that.
Incidentally, this patch makes GMP testing go a bit further, and the
testcase bug-qemu-ppc-again.s works correctly.
diff --git a/target-ppc/translate.c b/target-ppc/translate.c
index 1a84653..c44b96d 100644
--- a/target-ppc/translate.c
+++ b/target-ppc/translate.c
@@ -665,6 +665,7 @@ static inline void gen_op_cmpi32(TCGv arg0, target_ulong
arg1, int s, int crf)
static inline void gen_set_Rc0(DisasContext *ctx, TCGv reg)
{
+// suspicious code -- tege
if (NARROW_MODE(ctx)) {
gen_op_cmpi32(reg, 0, 1, 0);
} else {
@@ -675,7 +676,7 @@ static inline void gen_set_Rc0(DisasContext *ctx, TCGv reg)
/* cmp */
static void gen_cmp(DisasContext *ctx)
{
- if (NARROW_MODE(ctx) || !(ctx->opcode & 0x00200000)) {
+ if (!(ctx->opcode & 0x00200000)) {
gen_op_cmp32(cpu_gpr[rA(ctx->opcode)], cpu_gpr[rB(ctx->opcode)],
1, crfD(ctx->opcode));
} else {
@@ -687,7 +688,7 @@ static void gen_cmp(DisasContext *ctx)
/* cmpi */
static void gen_cmpi(DisasContext *ctx)
{
- if (NARROW_MODE(ctx) || !(ctx->opcode & 0x00200000)) {
+ if (!(ctx->opcode & 0x00200000)) {
gen_op_cmpi32(cpu_gpr[rA(ctx->opcode)], SIMM(ctx->opcode),
1, crfD(ctx->opcode));
} else {
@@ -699,7 +700,7 @@ static void gen_cmpi(DisasContext *ctx)
/* cmpl */
static void gen_cmpl(DisasContext *ctx)
{
- if (NARROW_MODE(ctx) || !(ctx->opcode & 0x00200000)) {
+ if (!(ctx->opcode & 0x00200000)) {
gen_op_cmp32(cpu_gpr[rA(ctx->opcode)], cpu_gpr[rB(ctx->opcode)],
0, crfD(ctx->opcode));
} else {
@@ -711,7 +712,7 @@ static void gen_cmpl(DisasContext *ctx)
/* cmpli */
static void gen_cmpli(DisasContext *ctx)
{
- if (NARROW_MODE(ctx) || !(ctx->opcode & 0x00200000)) {
+ if (!(ctx->opcode & 0x00200000)) {
gen_op_cmpi32(cpu_gpr[rA(ctx->opcode)], UIMM(ctx->opcode),
0, crfD(ctx->opcode));
} else {
--
Torbjörn
