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6893554: SPECjvm2008 mpegaudio fails with SecurityException

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The problem occurs with negative numbers, as the 32-bit input values are sign extended into the 64-bit registers.

Reviewed-by: kvn
This commit is contained in:
Christian Thalinger 2009-10-27 03:00:27 -07:00
parent 022d690049
commit ad6d07e80b
1 changed files with 6 additions and 4 deletions
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10
hotspot/src/cpu/sparc/vm/sparc.ad
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@ -9419,8 +9419,9 @@ instruct countLeadingZerosI(iRegI dst, iRegI src, iRegI tmp, flagsReg cr) %{
// 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 @@ instruct countLeadingZerosI(iRegI dst, iRegI src, iRegI tmp, flagsReg cr) %{
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 @@ instruct countLeadingZerosL(iRegI dst, iRegL src, iRegL tmp, flagsReg cr) %{
// 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"