Patchwork [08/18] tcg/arm: use the blx instruction when possible

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Submitter Aurelien Jarno
Date April 7, 2010, 5:51 p.m.
Message ID <1270662685-7379-9-git-send-email-aurelien@aurel32.net>
Download mbox | patch
Permalink /patch/49623/
State New
Headers show

Comments

Aurelien Jarno - April 7, 2010, 5:51 p.m.
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
---
 tcg/arm/tcg-target.c |   10 +++++++++-
 1 files changed, 9 insertions(+), 1 deletions(-)

Patch

diff --git a/tcg/arm/tcg-target.c b/tcg/arm/tcg-target.c
index 777c4ac..3360c23 100644
--- a/tcg/arm/tcg-target.c
+++ b/tcg/arm/tcg-target.c
@@ -333,6 +333,11 @@  static inline void tcg_out_bl(TCGContext *s, int cond, int32_t offset)
                     (((offset - 8) >> 2) & 0x00ffffff));
 }
 
+static inline void tcg_out_blx(TCGContext *s, int cond, int rn)
+{
+    tcg_out32(s, (cond << 28) | 0x012fff30 | rn);
+}
+
 static inline void tcg_out_dat_reg(TCGContext *s,
                 int cond, int opc, int rd, int rn, int rm, int shift)
 {
@@ -754,10 +759,13 @@  static inline void tcg_out_call(TCGContext *s, int cond, uint32_t addr)
 
 static inline void tcg_out_callr(TCGContext *s, int cond, int arg)
 {
-    /* TODO: on ARMv5 and ARMv6 replace with tcg_out_blx(s, cond, arg);  */
+#ifdef USE_ARMV5_INSTRUCTIONS
+    tcg_out_blx(s, cond, arg);
+#else
     tcg_out_dat_reg(s, cond, ARITH_MOV, TCG_REG_R14, 0,
                     TCG_REG_PC, SHIFT_IMM_LSL(0));
     tcg_out_bx(s, cond, arg);
+#endif
 }
 
 static inline void tcg_out_goto_label(TCGContext *s, int cond, int label_index)