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>Number: 6205 >Category: middle-end >Synopsis: -O -fpmath=sse breaks visibility of register accumulated sum >Confidential: no >Severity: serious >Priority: medium >Responsible: unassigned >State: open >Class: sw-bug >Submitter-Id: net >Arrival-Date: Sat Apr 06 07:16:00 PST 2002 >Closed-Date: >Last-Modified: >Originator: Tim Prince >Release: 3.1 >Organization: >Environment: linux-SuSE 7.3 or cygwin/2K >Description: result of a float sum in SSE register is seen as NaN in certain contexts, when built with -O -mfpmath=sse Problem originally seen in larger examples in g77; case available on request. >How-To-Repeat: gcc -O -march=pentium3 -mfpmath=sse badsum.c ./a.out result seen as nan in printf(), but is OK if -O or -mfpmath options are removed >Fix: >Release-Note: >Audit-Trail: >Unformatted: ----gnatsweb-attachment---- Content-Type: application/octet-stream; name="badsum.c"; name="badsum.c" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="badsum.c" I2luY2x1ZGUgPHN0ZGxpYi5oPgojaW5jbHVkZSA8c3RkaW8uaD4KaW50IG1haW4oKXsKaW50IGks bj03OwkvL2Nob29zZSBhbnkgbiA8IHNxcnQoMS9GTFRfRVBTSUxPTikKICAgIGZsb2F0IGNvbXAs c3VtPTA7CiAgICBmb3IoaT0xO2k8PW47KytpKQoJc3VtICs9IGk7CiAgICBwcmludGYoInN1bSBv ZiAlZCBpbnRzOiAlZ1xuIixuLHN1bSk7CiAgICBjb21wID0gbioobiouNWYrLjVmKTsKICAgIGlm KHN1bSAhPSBjb21wKXsKCXByaW50ZigiQmFkIHN1bSAoc2VlbiB3aXRoIGdjYyAtTyAtbWFyY2g9 cGVudGl1bXBybyAtbXNzZSlcbiIpOwoJYWJvcnQ7Cgl9CiAgICByZXR1cm4gMDsKfQo=
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