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[Risu,3/7] risu_ppc64le: implement sign extend for small neg constants

Message ID 1486174642-14883-4-git-send-email-joserz@linux.vnet.ibm.com
State New
Headers show

Commit Message

Jose Ricardo Ziviani Feb. 4, 2017, 2:17 a.m. UTC 
Signed-off-by: Jose Ricardo Ziviani <joserz@linux.vnet.ibm.com>
---
 risugen_ppc64.pm | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)
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Patch

diff --git a/risugen_ppc64.pm b/risugen_ppc64.pm
index 40f3d4f..561c17b 100644
--- a/risugen_ppc64.pm
+++ b/risugen_ppc64.pm
@@ -75,6 +75,13 @@  sub write_add_ri($$$)
     insn32((0xe << 26) | ($rt << 21) | ($ra << 16) | ($imm & 0xffff));
 }
 
+sub write_sxt32($$)
+{
+    my ($ra, $rs) = @_;
+
+    insn32((0x1f << 26) | ($rs << 21) | ($ra << 16) | 0x7b4);
+}
+
 sub write_mov_ri($$)
 {
     # We always use a MOVW/MOVT pair, for simplicity.
@@ -87,10 +94,10 @@  sub write_mov_ri($$)
         write_mov_ri16($rd, $imm);
     }
 
-    #if ($is_aarch64 && $imm < 0) {
+    if ($imm < 0) {
         # sign extend to allow small negative imm constants
-    #    write_sxt32($rd, $rd);
-    #}
+        write_sxt32($rd, $rd);
+    }
 }
 
 sub write_random_ppc64_fpdata()