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From: Horst.Lehser@hightec-rt.com To: gcc-gnats@gcc.gnu.org Subject: optimization/7632: gcc 3.2 for PowerPC: instruction scheduling ignores dependency in variable asignments Date: Mon, 19 Aug 2002 05:26:00 -0000 [thread overview] Message-ID: <20020819114916.21265.qmail@sources.redhat.com> (raw) >Number: 7632 >Category: optimization >Synopsis: gcc 3.2 for PowerPC: instruction scheduling ignores dependency in variable asignments >Confidential: no >Severity: critical >Priority: medium >Responsible: unassigned >State: open >Class: sw-bug >Submitter-Id: net >Arrival-Date: Mon Aug 19 04:56:01 PDT 2002 >Closed-Date: >Last-Modified: >Originator: Horst Lehser >Release: unknown-1.0 >Organization: >Environment: >Description: the following C source will generate incorrect code double a; double foo(void) { ((int *)&a)[1] += 5; return; } Generated assembler foo: lis %r3,a+4@ha lis %r5,a@ha lwz %r4,a+4@l(%r3) lfd %f1,a@l(%r5) /* a not modified yet */ addi %r0,%r4,10 stw %r0,a+4@l(%r3) blr >How-To-Repeat: compile the following code with gcc -O3 -S double a; double foo(void) { ((int *)&a)[1] += 10; return a; } >Fix: >Release-Note: >Audit-Trail: >Unformatted:
next reply other threads:[~2002-08-19 11:56 UTC|newest] Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top 2002-08-19 5:26 Horst.Lehser [this message] 2002-08-19 5:36 Andrew Pinski 2002-08-19 8:56 Daniel Jacobowitz 2002-09-11 12:06 dje
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