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[2/6] target-ppc: Optimize rlwinm MB=0 ME=31

Message ID 1408994744-17312-3-git-send-email-tommusta@gmail.com
State New
Headers show

Commit Message

Tom Musta Aug. 25, 2014, 7:25 p.m. UTC 
Optimize the special case of rlwinm where MB=0 and ME=31.  This can
be implemented as a 32-bit ROTL.

Signed-off-by: Tom Musta <tommusta@gmail.com>
Suggested-by: Richard Henderson <rth@twiddle.net>
---
 target-ppc/translate.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)
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Patch

diff --git a/target-ppc/translate.c b/target-ppc/translate.c
index 095b83c..889e37d 100644
--- a/target-ppc/translate.c
+++ b/target-ppc/translate.c
@@ -1691,6 +1691,12 @@  static void gen_rlwinm(DisasContext *ctx)
         tcg_gen_shri_tl(t0, t0, mb);
         tcg_gen_ext32u_tl(cpu_gpr[rA(ctx->opcode)], t0);
         tcg_temp_free(t0);
+    } else if (likely(mb == 0 && me == 31)) {
+        TCGv_i32 t0 = tcg_temp_new_i32();
+        tcg_gen_trunc_tl_i32(t0, cpu_gpr[rS(ctx->opcode)]);
+        tcg_gen_rotli_i32(t0, t0, sh);
+        tcg_gen_extu_i32_tl(cpu_gpr[rA(ctx->opcode)], t0);
+        tcg_temp_free_i32(t0);
     } else {
         TCGv t0 = tcg_temp_new();
 #if defined(TARGET_PPC64)