Re: [Qemu-devel] [PATCH v1 05/10] target/ppc: update overflow flags for add/sub

[Richard Henderson]

On 02/20/2017 09:11 PM, Nikunj A Dadhania wrote:
     tcg_temp_free(t0);
+    tcg_gen_extract_tl(cpu_ov32, cpu_ov, 31, 1);
+    tcg_gen_extract_tl(cpu_ov, cpu_ov, 63, 1);
     if (NARROW_MODE(ctx)) {
-        tcg_gen_ext32s_tl(cpu_ov, cpu_ov);
+        tcg_gen_mov_tl(cpu_ov, cpu_ov32);
     }
-    tcg_gen_shri_tl(cpu_ov, cpu_ov, TARGET_LONG_BITS - 1);

Don't compute ov32 only to overwrite it again.  Move the ov32 extraction into 
an else of NARROW_MODE.


r~