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fortran/6138: Incorrect access of integer*1 variables on PA
- From: dave at hiauly1 dot hia dot nrc dot ca
- To: gcc-gnats at gcc dot gnu dot org
- Date: 2 Apr 2002 22:01:14 -0000
- Subject: fortran/6138: Incorrect access of integer*1 variables on PA
- Reply-to: dave at hiauly1 dot hia dot nrc dot ca
>Number: 6138
>Category: fortran
>Synopsis: Incorrect access of integer*1 variables on PA
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: unassigned
>State: open
>Class: sw-bug
>Submitter-Id: net
>Arrival-Date: Tue Apr 02 14:06:01 PST 2002
>Closed-Date:
>Last-Modified:
>Originator: Dave Anglin
>Release: gcc 3.1 (prerelease) and gcc 3.2
>Organization:
>Environment:
hppa-linux, hppa2.0w-hp-hpux11*, hppa1.1-hp-hpux10.20
>Description:
Problem noted by examing f90-intrinsic-numeric.f FAIL.
The following snippet from the above test shows the
problem:
j = -9
ja = 9
k = j
ka = ja
call c_i2(ABS(j),ja,'ABS(integer*2)')
call c_i1(ABS(k),ka,'ABS(integer*1)')
Incorrect code is generated for "ka" load.
ldi 9,%r4
sth %r4,-120(%r30)
ldb -117(%r30),%r19
The above assembly code shows the store generated for "ja"
and load for "ja". The offset should be -119, not -117.
This error is present in the initial rtl:
(insn 45 33 34 (set (reg:QI 101)
(mem/f:QI (plus:SI (reg/f:SI 90 virtual-stack-vars)
(const_int 3 [0x3])) [0 S1 A8])) -1 (nil)
(nil))
This occurs at -O1 and above. Looks like the g77 code
assumes that the load is from an integer*4 variable rather
than an integer*2 variable.
>How-To-Repeat:
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted: