https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119535
Bug ID: 119535
Summary: [15 regression] Firefox fails to build
(SkRasterPipeline_opts.h:1603:31: error: cannot
tail-call: other reasons)
Product: gcc
Version: 15.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: sjames at gcc dot gnu.org
Target Milestone: ---
Created attachment 60922
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=60922&action=edit
SkOpts.ii.xz
As discussed with pinskia, filing this so we can see if there's other lurking
issues or if it's the same as the known cases.
At `-O0`, it fails with:
```
$ g++ -c SkOpts.ii -march=znver2 -O0
[...]
/var/tmp/portage/www-client/firefox-136.0.3/work/firefox-136.0.3/gfx/skia/skia/src/opts/SkRasterPipeline_opts.h:
In function ‘void avx2::splat_3_constants(SkRasterPipelineStage*, size_t,
size_t, std::byte*, F, F, F, F, F, F, F, F)’:
/var/tmp/portage/www-client/firefox-136.0.3/work/firefox-136.0.3/gfx/skia/skia/src/opts/SkRasterPipeline_opts.h:4125:488:
error: cannot tail-call: address of caller arguments taken
4125 | STAGE_TAIL(splat_3_constants, SkRasterPipeline_ConstantCtx* packed) {
[...]
```
At `-O2 -fprofile-generate`, it fails with:
```
$ g++ -c SkOpts.ii -march=znver2 -O2 -fprofile-generate
[...]
/var/tmp/portage/www-client/firefox-136.0.3/work/firefox-136.0.3/gfx/skia/skia/src/opts/SkRasterPipeline_opts.h:
In function ‘void avx2::trace_scope(SkRasterPipelineStage*, size_t, size_t,
std::byte*, F, F, F, F, F, F, F, F)’:
/var/tmp/portage/www-client/firefox-136.0.3/work/firefox-136.0.3/gfx/skia/skia/src/opts/SkRasterPipeline_opts.h:4050:469:
error: cannot tail-call: memory reference or volatile after call
4050 | STAGE_TAIL(trace_scope, SkRasterPipeline_TraceScopeCtx* ctx) {
|
[...]
```
At `-O2 -pthread -fprofile-generate` (why is -pthread needed?):
```
$ g++ -c SkOpts.ii -march=znver2 -O2 -pthread -fprofile-generate
In file included from
/var/tmp/portage/www-client/firefox-136.0.3/work/firefox-136.0.3/gfx/skia/skia/src/core/SkOpts.cpp:16:
/var/tmp/portage/www-client/firefox-136.0.3/work/firefox-136.0.3/gfx/skia/skia/src/opts/SkRasterPipeline_opts.h:
In function ‘avx2::U64 avx2::gather(const uint64_t*, U32)’:
/var/tmp/portage/www-client/firefox-136.0.3/work/firefox-136.0.3/gfx/skia/skia/src/opts/SkRasterPipeline_opts.h:629:86:
warning: AVX512F vector return without AVX512F enabled changes the ABI
[-Wpsabi]
629 | SI U64 gather(const uint64_t* p, U32 ix) {
|
^
/var/tmp/portage/www-client/firefox-136.0.3/work/firefox-136.0.3/gfx/skia/skia/src/opts/SkRasterPipeline_opts.h:
In function ‘void avx2::from_10101010_xr(U64, F*, F*, F*, F*)’:
/var/tmp/portage/www-client/firefox-136.0.3/work/firefox-136.0.3/gfx/skia/skia/src/opts/SkRasterPipeline_opts.h:1796:51:
note: the ABI for passing parameters with 64-byte alignment has changed in GCC
4.6
1796 | SI void from_10101010_xr(U64 _10x6, F* r, F* g, F* b, F* a) {
| ^~~~~~~~~~~
/var/tmp/portage/www-client/firefox-136.0.3/work/firefox-136.0.3/gfx/skia/skia/src/opts/SkRasterPipeline_opts.h:
In function ‘void avx2::trace_scope(SkRasterPipelineStage*, size_t, size_t,
std::byte*, F, F, F, F, F, F, F, F)’:
/var/tmp/portage/www-client/firefox-136.0.3/work/firefox-136.0.3/gfx/skia/skia/src/opts/SkRasterPipeline_opts.h:4050:469:
error: cannot tail-call: other reasons
4050 | STAGE_TAIL(trace_scope, SkRasterPipeline_TraceScopeCtx* ctx) {
[...]
```
---
```
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-pc-linux-gnu/15/lto-wrapper
OFFLOAD_TARGET_NAMES=nvptx-none
OFFLOAD_TARGET_DEFAULT=1
Target: x86_64-pc-linux-gnu
Configured with:
/var/tmp/portage/sys-devel/gcc-15.0.9999/work/gcc-15.0.9999/configure
--host=x86_64-pc-linux-gnu --build=x86_64-pc-linux-gnu --prefix=/usr
--bindir=/usr/x86_64-pc-linux-gnu/gcc-bin/15
--includedir=/usr/lib/gcc/x86_64-pc-linux-gnu/15/include
--datadir=/usr/share/gcc-data/x86_64-pc-linux-gnu/15
--mandir=/usr/share/gcc-data/x86_64-pc-linux-gnu/15/man
--infodir=/usr/share/gcc-data/x86_64-pc-linux-gnu/15/info
--with-gxx-include-dir=/usr/lib/gcc/x86_64-pc-linux-gnu/15/include/g++-v15
--disable-silent-rules --disable-dependency-tracking
--with-python-dir=/share/gcc-data/x86_64-pc-linux-gnu/15/python
--enable-libphobos --enable-objc-gc
--enable-languages=c,c++,d,go,objc,obj-c++,fortran,ada,cobol,m2,rust
--enable-obsolete --enable-secureplt --disable-werror --with-system-zlib
--enable-nls --without-included-gettext --disable-libunwind-exceptions
--enable-checking=yes,extra,rtl --with-bugurl=https://bugs.gentoo.org/
--with-pkgversion='Gentoo Hardened 15.0.9999 p, commit
c2b5b58acd2b0240ed361bbc9a94bf61d2d26f8e' --with-gcc-major-version-only
--enable-libstdcxx-time --enable-lto --disable-libstdcxx-pch --enable-shared
--enable-threads=posix --enable-__cxa_atexit --enable-clocale=gnu
--enable-multilib --with-multilib-list=m32,m64 --disable-fixed-point
--enable-targets=all --enable-offload-defaulted
--enable-offload-targets=nvptx-none --enable-libgomp --disable-libssp
--enable-libada --disable-cet --disable-systemtap --enable-valgrind-annotations
--disable-vtable-verify --disable-libvtv --with-zstd --with-isl
--disable-isl-version-check --enable-default-pie --enable-host-pie
--enable-host-bind-now --enable-default-ssp --disable-fixincludes
--with-gxx-libcxx-include-dir=/usr/include/c++/v1
--with-build-config='bootstrap-O3 bootstrap-lto'
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 15.0.1 20250329 (experimental)
9018336252463ffed28f01badfdea2a3ca3ba5c8 (Gentoo Hardened 15.0.9999 p, commit
c2b5b58acd2b0240ed361bbc9a94bf61d2d26f8e)
```
