https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63870
Bug ID: 63870
Summary: [Aarch64] [ARM] Errors in use of NEON instrinsics are
reported incorrectly
Product: gcc
Version: 4.7.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: cbaylis at gcc dot gnu.org
Reporter: cbaylis at gcc dot gnu.org
CC: alan.lawrence at arm dot com
Target: arm-unknown-linux-gnueabi, aarch64-linux-gnu
Created attachment 33972
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=33972&action=edit
Example tests
Several NEON intrinsics have arguments which must be a constant integer in a
fixed range. At present, these constraints are enforced for most intrinsics
during assembly output, or, in some cases, not checked at all.
This can be fixed by using the %K format specifier to the error message. See
https://gcc.gnu.org/ml/gcc-patches/2014-11/msg01248.html for a proposed patch
and explanation.
Once that patch is applied, it is necessary to rework the expansion of the
builtins so that the constraints are checked during expansion. Some of this
work has been started for Aarch64
(https://gcc.gnu.org/ml/gcc-patches/2014-11/msg00421.html)
Example demonstration of incorrect error messages using attached test cases on
an ARM target. Note that the error message is reported at the end of each
function, rather than the line where the error occurs.
$ arm-unknown-linux-gnueabihf-gcc -c neon_const_range_tests/* -mfpu=neon
neon_const_range_tests/vld1.c: In function ‘f_vld1_lane’:
neon_const_range_tests/vld1.c:10:1: error: lane out of range
}
^
neon_const_range_tests/vld4.c: In function ‘f_vld4_lane’:
neon_const_range_tests/vld4.c:10:1: error: lane out of range
}
^
neon_const_range_tests/vmul_lane.c: In function ‘f_vmul_lane’:
neon_const_range_tests/vmul_lane.c:10:1: error: lane out of range
}
^
neon_const_range_tests/vshl.c: In function ‘f_vshl’:
neon_const_range_tests/vshl.c:10:1: error: constant out of range
}
^
neon_const_range_tests/vshrn_n.c: In function ‘f_vshrn_n’:
neon_const_range_tests/vshrn_n.c:10:1: error: constant out of range
}
^
neon_const_range_tests/vst1.c: In function ‘f_vst1_lane’:
neon_const_range_tests/vst1.c:9:1: error: lane out of range
}
^
neon_const_range_tests/vst4.c: In function ‘f_vst4_lane’:
neon_const_range_tests/vst4.c:9:1: error: lane out of range
}
^
