We can now detect and use divide instructions at runtime, rather than
having to restrict their availability to compile-time.
Signed-off-by: Richard Henderson <r...@twiddle.net>
---
tcg/arm/tcg-target.c | 16 ++++++++++++++--
tcg/arm/tcg-target.h | 14 ++++++++------
2 files changed, 22 insertions(+), 8 deletions(-)
diff --git a/tcg/arm/tcg-target.c b/tcg/arm/tcg-target.c
index 3d43412..f6bc165 100644
--- a/tcg/arm/tcg-target.c
+++ b/tcg/arm/tcg-target.c
@@ -67,6 +67,13 @@ static const int use_armv7_instructions = 0;
#endif
#undef USE_ARMV7_INSTRUCTIONS
+#ifndef use_idiv_instructions
+bool use_idiv_instructions;
+#endif
+#ifdef CONFIG_GETAUXVAL
+# include <sys/auxv.h>
+#endif
+
#ifndef NDEBUG
static const char * const tcg_target_reg_names[TCG_TARGET_NB_REGS] = {
"%r0",
@@ -2041,18 +2048,23 @@ static const TCGTargetOpDef arm_op_defs[] = {
{ INDEX_op_deposit_i32, { "r", "0", "rZ" } },
-#if TCG_TARGET_HAS_div_i32
{ INDEX_op_div_i32, { "r", "r", "r" } },
{ INDEX_op_rem_i32, { "r", "r", "r" } },
{ INDEX_op_divu_i32, { "r", "r", "r" } },
{ INDEX_op_remu_i32, { "r", "r", "r" } },
-#endif
{ -1 },
};
static void tcg_target_init(TCGContext *s)
{
+#if defined(CONFIG_GETAUXVAL) && !defined(use_idiv_instructions)
+ {
+ unsigned long hwcap = getauxval(AT_HWCAP);
+ use_idiv_instructions = hwcap & (HWCAP_ARM_IDIVA | HWCAP_ARM_IDIVT);
+ }
+#endif
+
#if !defined(CONFIG_USER_ONLY)
/* fail safe */
if ((1 << CPU_TLB_ENTRY_BITS) != sizeof(CPUTLBEntry))
diff --git a/tcg/arm/tcg-target.h b/tcg/arm/tcg-target.h
index 3be41cc..4e1a88f 100644
--- a/tcg/arm/tcg-target.h
+++ b/tcg/arm/tcg-target.h
@@ -49,6 +49,13 @@ typedef enum {
#define TCG_TARGET_NB_REGS 16
+#ifdef __ARM_ARCH_EXT_IDIV__
+#define use_idiv_instructions 1
+#else
+extern bool use_idiv_instructions;
+#endif
+
+
/* used for function call generation */
#define TCG_REG_CALL_STACK TCG_REG_R13
#define TCG_TARGET_STACK_ALIGN 8
@@ -73,12 +80,7 @@ typedef enum {
#define TCG_TARGET_HAS_deposit_i32 1
#define TCG_TARGET_HAS_movcond_i32 1
#define TCG_TARGET_HAS_muls2_i32 1
-
-#ifdef __ARM_ARCH_EXT_IDIV__
-#define TCG_TARGET_HAS_div_i32 1
-#else
-#define TCG_TARGET_HAS_div_i32 0
-#endif
+#define TCG_TARGET_HAS_div_i32 use_idiv_instructions
extern bool tcg_target_deposit_valid(int ofs, int len);
#define TCG_TARGET_deposit_i32_valid tcg_target_deposit_valid
--
1.8.1.4
