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Arithmatic right shift of long long (64 bit) value returns wrong value. See attached file (x.c) for a program that fails with -O0 (with call to __ashrdi3) but works with optimization because the call is optimized away. Release: 3.0.2 Environment: hppa1.1-hp-hpux11.00 How-To-Repeat: Compile x.c and run it *without* optimization on a 32 bit PA machine. With optimization it works.
From: Steve Ellcey <sje@cup.hp.com> To: law@redhat.com Cc: gcc-gnats@gcc.gnu.org Subject: Re: target/7250: __ashrdi3 returns wrong value on 32 bit hppa Date: Tue, 9 Jul 2002 16:12:56 -0700 (PDT) Oh poo. I hate it when I do something stupid. I was printing out the value of a "long long" variable with a "%d" format instead of "%lld" and the random garbage that I got made it look I was getting different results. I thought this was causing a problem that popped up when I updated cse.c and got a new change but it looks like that is a different problem and is now fixed in a cse.c patch I just saw in gcc-patches. This defect can be closed. Can I close it myself or do I need some permssion to do that? I have write-after-approval permission for the GCC tree but I haven't tried messing about with GNAT other then to submit a defect. Steve Ellcey sje@cup.hp.com
From: Jeff Law <law@porcupine.slc.redhat.com> To: sje@cup.hp.com Cc: gcc-gnats@gcc.gnu.org Subject: Re: target/7250: __ashrdi3 returns wrong value on 32 bit hppa Date: Tue, 09 Jul 2002 16:48:46 -0600 In message <20020709203142.10159.qmail@sources.redhat.com>, sje@cup.hp.com writ es: > >>Number: 7250 >>Category: target >>Synopsis: __ashrdi3 returns wrong value on 32 bit hppa >>Confidential: no >>Severity: serious >>Priority: medium >>Responsible: unassigned >>State: open >>Class: sw-bug >>Submitter-Id: net >>Arrival-Date: Tue Jul 09 13:36:01 PDT 2002 >>Closed-Date: >>Last-Modified: >>Originator: sje@cup.hp.com >>Release: 3.0.2 >>Organization: >>Environment: >hppa1.1-hp-hpux11.00 >>Description: >Arithmatic right shift of long long (64 bit) value returns wrong value. See >attached file (x.c) for a program that >fails with -O0 (with call to __ashrdi3) but works with optimization because t >he call is optimized away. > >>How-To-Repeat: >Compile x.c and run it *without* optimization on a 32 bit PA machine. With o >ptimization it works. Can you look a little deeper into this? It seems quite odd that ashrdi3 would return the wrong value for a shift count of zero as it special cases zero count in libgcc2.c: DWtype __ashrdi3 (DWtype u, word_type b) { DWunion w; word_type bm; DWunion uu; if (b == 0) return u; [ ... ] Jeff
State-Changed-From-To: open->closed State-Changed-Why: Thinko, not a bug.
From: Jeff Law <law@porcupine.slc.redhat.com> To: Steve Ellcey <sje@cup.hp.com> Cc: law@redhat.com, gcc-gnats@gcc.gnu.org Subject: Re: target/7250: __ashrdi3 returns wrong value on 32 bit hppa Date: Wed, 10 Jul 2002 12:51:15 -0600 In message <200207092312.QAA07337@hpsje.cup.hp.com>, Steve Ellcey writes: >Oh poo. I hate it when I do something stupid. I was printing out the >value of a "long long" variable with a "%d" format instead of "%lld" and >the random garbage that I got made it look I was getting different >results. No problem. >This defect can be closed. Can I close it myself or do I need some >permssion to do that? I have write-after-approval permission for the >GCC tree but I haven't tried messing about with GNAT other then to >submit a defect. I took care of it. jeff