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changeset 1040:f875b4f472f7

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6893554: SPECjvm2008 mpegaudio fails with SecurityException Summary: The problem occurs with negative numbers, as the 32-bit input values are sign extended into the 64-bit registers. Reviewed-by: kvn
author twisti
date Tue, 27 Oct 2009 03:00:27 -0700
parents 873ec3787992
children 4926bf2d292f
files src/cpu/sparc/vm/sparc.ad
diffstat 1 files changed, 6 insertions(+), 4 deletions(-) [+]
line wrap: on
line diff
--- a/src/cpu/sparc/vm/sparc.ad	Wed Oct 21 09:15:33 2009 -0700
+++ b/src/cpu/sparc/vm/sparc.ad	Tue Oct 27 03:00:27 2009 -0700
@@ -9419,8 +9419,9 @@
   // x |= (x >> 8);
   // x |= (x >> 16);
   // return (WORDBITS - popc(x));
-  format %{ "SRL     $src,1,$dst\t! count leading zeros (int)\n\t"
-            "OR      $src,$tmp,$dst\n\t"
+  format %{ "SRL     $src,1,$tmp\t! count leading zeros (int)\n\t"
+            "SRL     $src,0,$dst\t! 32-bit zero extend\n\t"
+            "OR      $dst,$tmp,$dst\n\t"
             "SRL     $dst,2,$tmp\n\t"
             "OR      $dst,$tmp,$dst\n\t"
             "SRL     $dst,4,$tmp\n\t"
@@ -9437,7 +9438,8 @@
     Register Rsrc = $src$$Register;
     Register Rtmp = $tmp$$Register;
     __ srl(Rsrc, 1, Rtmp);
-    __ or3(Rsrc, Rtmp, Rdst);
+    __ srl(Rsrc, 0, Rdst);
+    __ or3(Rdst, Rtmp, Rdst);
     __ srl(Rdst, 2, Rtmp);
     __ or3(Rdst, Rtmp, Rdst);
     __ srl(Rdst, 4, Rtmp);
@@ -9465,7 +9467,7 @@
   // x |= (x >> 16);
   // x |= (x >> 32);
   // return (WORDBITS - popc(x));
-  format %{ "SRLX    $src,1,$dst\t! count leading zeros (long)\n\t"
+  format %{ "SRLX    $src,1,$tmp\t! count leading zeros (long)\n\t"
             "OR      $src,$tmp,$dst\n\t"
             "SRLX    $dst,2,$tmp\n\t"
             "OR      $dst,$tmp,$dst\n\t"