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[20/25] target-openrisc: Optimize l.jal to next

Message ID 1465862305-14090-21-git-send-email-rth@twiddle.net (mailing list archive)
State New, archived
Headers show

Commit Message

Richard Henderson June 13, 2016, 11:58 p.m. UTC 
This allows the tcg optimizer to see, and fold, all of the
constants involved in a GOT base register load sequence.

Signed-off-by: Richard Henderson <rth@twiddle.net>
---
 target-openrisc/translate.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)
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Patch

diff --git a/target-openrisc/translate.c b/target-openrisc/translate.c
index 70aadbc..31f4307 100644
--- a/target-openrisc/translate.c
+++ b/target-openrisc/translate.c
@@ -189,7 +189,11 @@  static void gen_jump(DisasContext *dc, int32_t n26, uint32_t reg, uint32_t op0)
         tcg_gen_movi_tl(jmp_pc, tmp_pc);
         break;
     case 0x01:     /* l.jal */
-        tcg_gen_movi_tl(cpu_R[9], (dc->pc + 8));
+        tcg_gen_movi_tl(cpu_R[9], dc->pc + 8);
+        /* Optimize jal being used to load the PC for PIC.  */
+        if (tmp_pc == dc->pc + 8) {
+            return;
+        }
         tcg_gen_movi_tl(jmp_pc, tmp_pc);
         break;
     case 0x03:     /* l.bnf */