This significantly streamlines carry and overflow production.
Signed-off-by: Richard Henderson <r...@twiddle.net>
---
target/openrisc/cpu.h | 13 +++-
target/openrisc/exception_helper.c | 31 ++++++++--
target/openrisc/helper.h | 4 +-
target/openrisc/translate.c | 119 +++++++++++++------------------------
4 files changed, 78 insertions(+), 89 deletions(-)
diff --git a/target/openrisc/cpu.h b/target/openrisc/cpu.h
index 9e349f9..82b87b3 100644
--- a/target/openrisc/cpu.h
+++ b/target/openrisc/cpu.h
@@ -287,7 +287,9 @@ typedef struct CPUOpenRISCState {
target_ulong eear; /* Exception EA register */
target_ulong sr_f; /* the SR_F bit, values 0, 1. */
- uint32_t sr; /* Supervisor register, without SR_F */
+ target_ulong sr_cy; /* the SR_CY bit, values 0, 1. */
+ target_long sr_ov; /* the SR_OV bit (in the sign bit only) */
+ uint32_t sr; /* Supervisor register, without SR_{F,CY,OV} */
uint32_t vr; /* Version register */
uint32_t upr; /* Unit presence register */
uint32_t cpucfgr; /* CPU configure register */
@@ -414,13 +416,18 @@ static inline int cpu_mmu_index(CPUOpenRISCState *env,
bool ifetch)
static inline uint32_t cpu_get_sr(CPUOpenRISCState *env)
{
- return env->sr + env->sr_f * SR_F;
+ return (env->sr
+ + env->sr_f * SR_F
+ + env->sr_cy * SR_CY
+ + (env->sr_ov < 0) * SR_OV);
}
static inline void cpu_set_sr(CPUOpenRISCState *env, uint32_t val)
{
env->sr_f = (val & SR_F) != 0;
- env->sr = (val & ~SR_F) | SR_FO;
+ env->sr_cy = (val & SR_CY) != 0;
+ env->sr_ov = (val & SR_OV ? -1 : 0);
+ env->sr = (val & ~(SR_F | SR_CY | SR_OV)) | SR_FO;
}
#define CPU_INTERRUPT_TIMER CPU_INTERRUPT_TGT_INT_0
diff --git a/target/openrisc/exception_helper.c
b/target/openrisc/exception_helper.c
index 5147da6..1536053 100644
--- a/target/openrisc/exception_helper.c
+++ b/target/openrisc/exception_helper.c
@@ -30,13 +30,32 @@ void HELPER(exception)(CPUOpenRISCState *env, uint32_t excp)
raise_exception(cpu, excp);
}
-void HELPER(ove)(CPUOpenRISCState *env, target_ulong test)
+static void QEMU_NORETURN do_range(CPUOpenRISCState *env, uintptr_t pc)
{
- if (unlikely(test)) {
- OpenRISCCPU *cpu = openrisc_env_get_cpu(env);
- CPUState *cs = CPU(cpu);
+ OpenRISCCPU *cpu = openrisc_env_get_cpu(env);
+ CPUState *cs = CPU(cpu);
+
+ cs->exception_index = EXCP_RANGE;
+ cpu_loop_exit_restore(cs, pc);
+}
+
+void HELPER(ove_cy)(CPUOpenRISCState *env)
+{
+ if (env->sr_cy) {
+ do_range(env, GETPC());
+ }
+}
+
+void HELPER(ove_ov)(CPUOpenRISCState *env)
+{
+ if (env->sr_ov < 0) {
+ do_range(env, GETPC());
+ }
+}
- cs->exception_index = EXCP_RANGE;
- cpu_loop_exit_restore(cs, GETPC());
+void HELPER(ove_cyov)(CPUOpenRISCState *env)
+{
+ if (env->sr_cy || env->sr_ov < 0) {
+ do_range(env, GETPC());
}
}
diff --git a/target/openrisc/helper.h b/target/openrisc/helper.h
index c2c8098..f4d97a2 100644
--- a/target/openrisc/helper.h
+++ b/target/openrisc/helper.h
@@ -19,7 +19,9 @@
/* exception */
DEF_HELPER_FLAGS_2(exception, 0, void, env, i32)
-DEF_HELPER_FLAGS_2(ove, TCG_CALL_NO_WG, void, env, tl)
+DEF_HELPER_FLAGS_1(ove_cy, TCG_CALL_NO_WG, void, env)
+DEF_HELPER_FLAGS_1(ove_ov, TCG_CALL_NO_WG, void, env)
+DEF_HELPER_FLAGS_1(ove_cyov, TCG_CALL_NO_WG, void, env)
/* float */
DEF_HELPER_FLAGS_2(itofd, 0, i64, env, i64)
diff --git a/target/openrisc/translate.c b/target/openrisc/translate.c
index 405a1a0..6c745d3 100644
--- a/target/openrisc/translate.c
+++ b/target/openrisc/translate.c
@@ -55,6 +55,8 @@ static TCGv jmp_pc; /* l.jr/l.jalr temp pc */
static TCGv cpu_npc;
static TCGv cpu_ppc;
static TCGv cpu_sr_f; /* bf/bnf, F flag taken */
+static TCGv cpu_sr_cy; /* carry (unsigned overflow) */
+static TCGv cpu_sr_ov; /* signed overflow */
static TCGv cpu_lock_addr;
static TCGv cpu_lock_value;
static TCGv_i32 fpcsr;
@@ -90,6 +92,10 @@ void openrisc_translate_init(void)
offsetof(CPUOpenRISCState, jmp_pc), "jmp_pc");
cpu_sr_f = tcg_global_mem_new(cpu_env,
offsetof(CPUOpenRISCState, sr_f), "sr_f");
+ cpu_sr_cy = tcg_global_mem_new(cpu_env,
+ offsetof(CPUOpenRISCState, sr_cy), "sr_cy");
+ cpu_sr_ov = tcg_global_mem_new(cpu_env,
+ offsetof(CPUOpenRISCState, sr_ov), "sr_ov");
cpu_lock_addr = tcg_global_mem_new(cpu_env,
offsetof(CPUOpenRISCState, lock_addr),
"lock_addr");
@@ -233,27 +239,24 @@ static void gen_jump(DisasContext *dc, int32_t n26,
uint32_t reg, uint32_t op0)
gen_sync_flags(dc);
}
-static void gen_ove_cy(DisasContext *dc, TCGv cy)
+static void gen_ove_cy(DisasContext *dc)
{
if (dc->tb_flags & SR_OVE) {
- gen_helper_ove(cpu_env, cy);
+ gen_helper_ove_cy(cpu_env);
}
}
-static void gen_ove_ov(DisasContext *dc, TCGv ov)
+static void gen_ove_ov(DisasContext *dc)
{
if (dc->tb_flags & SR_OVE) {
- gen_helper_ove(cpu_env, ov);
+ gen_helper_ove_ov(cpu_env);
}
}
-static void gen_ove_cyov(DisasContext *dc, TCGv cy, TCGv ov)
+static void gen_ove_cyov(DisasContext *dc)
{
if (dc->tb_flags & SR_OVE) {
- TCGv t0 = tcg_temp_new();
- tcg_gen_or_tl(t0, cy, ov);
- gen_helper_ove(cpu_env, t0);
- tcg_temp_free(t0);
+ gen_helper_ove_cyov(cpu_env);
}
}
@@ -261,143 +264,101 @@ static void gen_add(DisasContext *dc, TCGv dest, TCGv
srca, TCGv srcb)
{
TCGv t0 = tcg_const_tl(0);
TCGv res = tcg_temp_new();
- TCGv sr_cy = tcg_temp_new();
- TCGv sr_ov = tcg_temp_new();
- tcg_gen_add2_tl(res, sr_cy, srca, t0, srcb, t0);
- tcg_gen_xor_tl(sr_ov, srca, srcb);
+ tcg_gen_add2_tl(res, cpu_sr_cy, srca, t0, srcb, t0);
+ tcg_gen_xor_tl(cpu_sr_ov, srca, srcb);
tcg_gen_xor_tl(t0, res, srcb);
- tcg_gen_andc_tl(sr_ov, t0, sr_ov);
+ tcg_gen_andc_tl(cpu_sr_ov, t0, cpu_sr_ov);
tcg_temp_free(t0);
tcg_gen_mov_tl(dest, res);
tcg_temp_free(res);
- tcg_gen_shri_tl(sr_ov, sr_ov, TARGET_LONG_BITS - 1);
- tcg_gen_deposit_tl(cpu_sr, cpu_sr, sr_cy, ctz32(SR_CY), 1);
- tcg_gen_deposit_tl(cpu_sr, cpu_sr, sr_ov, ctz32(SR_OV), 1);
-
- gen_ove_cyov(dc, sr_ov, sr_cy);
- tcg_temp_free(sr_ov);
- tcg_temp_free(sr_cy);
+ gen_ove_cyov(dc);
}
static void gen_addc(DisasContext *dc, TCGv dest, TCGv srca, TCGv srcb)
{
TCGv t0 = tcg_const_tl(0);
TCGv res = tcg_temp_new();
- TCGv sr_cy = tcg_temp_new();
- TCGv sr_ov = tcg_temp_new();
-
- tcg_gen_shri_tl(sr_cy, cpu_sr, ctz32(SR_CY));
- tcg_gen_andi_tl(sr_cy, sr_cy, 1);
- tcg_gen_add2_tl(res, sr_cy, srca, t0, sr_cy, t0);
- tcg_gen_add2_tl(res, sr_cy, res, sr_cy, srcb, t0);
- tcg_gen_xor_tl(sr_ov, srca, srcb);
+ tcg_gen_add2_tl(res, cpu_sr_cy, srca, t0, cpu_sr_cy, t0);
+ tcg_gen_add2_tl(res, cpu_sr_cy, res, cpu_sr_cy, srcb, t0);
+ tcg_gen_xor_tl(cpu_sr_ov, srca, srcb);
tcg_gen_xor_tl(t0, res, srcb);
- tcg_gen_andc_tl(sr_ov, t0, sr_ov);
+ tcg_gen_andc_tl(cpu_sr_ov, t0, cpu_sr_ov);
tcg_temp_free(t0);
tcg_gen_mov_tl(dest, res);
tcg_temp_free(res);
- tcg_gen_shri_tl(sr_ov, sr_ov, TARGET_LONG_BITS - 1);
- tcg_gen_deposit_tl(cpu_sr, cpu_sr, sr_cy, ctz32(SR_CY), 1);
- tcg_gen_deposit_tl(cpu_sr, cpu_sr, sr_ov, ctz32(SR_OV), 1);
-
- gen_ove_cyov(dc, sr_ov, sr_cy);
- tcg_temp_free(sr_ov);
- tcg_temp_free(sr_cy);
+ gen_ove_cyov(dc);
}
static void gen_sub(DisasContext *dc, TCGv dest, TCGv srca, TCGv srcb)
{
TCGv res = tcg_temp_new();
- TCGv sr_cy = tcg_temp_new();
- TCGv sr_ov = tcg_temp_new();
tcg_gen_sub_tl(res, srca, srcb);
- tcg_gen_xor_tl(sr_cy, srca, srcb);
- tcg_gen_xor_tl(sr_ov, res, srcb);
- tcg_gen_and_tl(sr_ov, sr_ov, sr_cy);
- tcg_gen_setcond_tl(TCG_COND_LTU, sr_cy, srca, srcb);
+ tcg_gen_xor_tl(cpu_sr_cy, srca, srcb);
+ tcg_gen_xor_tl(cpu_sr_ov, res, srcb);
+ tcg_gen_and_tl(cpu_sr_ov, cpu_sr_ov, cpu_sr_cy);
+ tcg_gen_setcond_tl(TCG_COND_LTU, cpu_sr_cy, srca, srcb);
tcg_gen_mov_tl(dest, res);
tcg_temp_free(res);
- tcg_gen_shri_tl(sr_ov, sr_ov, TARGET_LONG_BITS - 1);
- tcg_gen_deposit_tl(cpu_sr, cpu_sr, sr_cy, ctz32(SR_CY), 1);
- tcg_gen_deposit_tl(cpu_sr, cpu_sr, sr_ov, ctz32(SR_OV), 1);
-
- gen_ove_cyov(dc, sr_ov, sr_cy);
- tcg_temp_free(sr_ov);
- tcg_temp_free(sr_cy);
+ gen_ove_cyov(dc);
}
static void gen_mul(DisasContext *dc, TCGv dest, TCGv srca, TCGv srcb)
{
- TCGv sr_ov = tcg_temp_new();
TCGv t0 = tcg_temp_new();
- tcg_gen_muls2_tl(dest, sr_ov, srca, srcb);
+ tcg_gen_muls2_tl(dest, cpu_sr_ov, srca, srcb);
tcg_gen_sari_tl(t0, dest, TARGET_LONG_BITS - 1);
- tcg_gen_setcond_tl(TCG_COND_NE, sr_ov, sr_ov, t0);
+ tcg_gen_setcond_tl(TCG_COND_NE, cpu_sr_ov, cpu_sr_ov, t0);
tcg_temp_free(t0);
- tcg_gen_deposit_tl(cpu_sr, cpu_sr, sr_ov, ctz32(SR_OV), 1);
-
- gen_ove_ov(dc, sr_ov);
- tcg_temp_free(sr_ov);
+ tcg_gen_neg_tl(cpu_sr_ov, cpu_sr_ov);
+ gen_ove_ov(dc);
}
static void gen_mulu(DisasContext *dc, TCGv dest, TCGv srca, TCGv srcb)
{
- TCGv sr_cy = tcg_temp_new();
-
- tcg_gen_muls2_tl(dest, sr_cy, srca, srcb);
- tcg_gen_setcondi_tl(TCG_COND_NE, sr_cy, sr_cy, 0);
-
- tcg_gen_deposit_tl(cpu_sr, cpu_sr, sr_cy, ctz32(SR_CY), 1);
+ tcg_gen_muls2_tl(dest, cpu_sr_cy, srca, srcb);
+ tcg_gen_setcondi_tl(TCG_COND_NE, cpu_sr_cy, cpu_sr_cy, 0);
- gen_ove_cy(dc, sr_cy);
- tcg_temp_free(sr_cy);
+ gen_ove_cy(dc);
}
static void gen_div(DisasContext *dc, TCGv dest, TCGv srca, TCGv srcb)
{
- TCGv sr_ov = tcg_temp_new();
TCGv t0 = tcg_temp_new();
- tcg_gen_setcondi_tl(TCG_COND_EQ, sr_ov, srcb, 0);
+ tcg_gen_setcondi_tl(TCG_COND_EQ, cpu_sr_ov, srcb, 0);
/* The result of divide-by-zero is undefined.
Supress the host-side exception by dividing by 1. */
- tcg_gen_or_tl(t0, srcb, sr_ov);
+ tcg_gen_or_tl(t0, srcb, cpu_sr_ov);
tcg_gen_div_tl(dest, srca, t0);
tcg_temp_free(t0);
- tcg_gen_deposit_tl(cpu_sr, cpu_sr, sr_ov, ctz32(SR_OV), 1);
-
- gen_ove_ov(dc, sr_ov);
- tcg_temp_free(sr_ov);
+ tcg_gen_neg_tl(cpu_sr_ov, cpu_sr_ov);
+ gen_ove_ov(dc);
}
static void gen_divu(DisasContext *dc, TCGv dest, TCGv srca, TCGv srcb)
{
- TCGv sr_cy = tcg_temp_new();
TCGv t0 = tcg_temp_new();
- tcg_gen_setcondi_tl(TCG_COND_EQ, sr_cy, srcb, 0);
+ tcg_gen_setcondi_tl(TCG_COND_EQ, cpu_sr_cy, srcb, 0);
/* The result of divide-by-zero is undefined.
Supress the host-side exception by dividing by 1. */
- tcg_gen_or_tl(t0, srcb, sr_cy);
+ tcg_gen_or_tl(t0, srcb, cpu_sr_cy);
tcg_gen_divu_tl(dest, srca, t0);
tcg_temp_free(t0);
- tcg_gen_deposit_tl(cpu_sr, cpu_sr, sr_cy, ctz32(SR_CY), 1);
-
- gen_ove_cy(dc, sr_cy);
- tcg_temp_free(sr_cy);
+ gen_ove_cy(dc);
}
static void gen_lwa(DisasContext *dc, TCGv rd, TCGv ra, int32_t ofs)
--
2.9.3
