Hi Andrew, On Fri, 2023-05-05 08:17:19 -0700, Andrew Pinski via Gcc-patches wrote: > While looking into a different issue, I noticed that it > would take until the second forwprop pass to do some > forward proping and it was because the ssa name was > used more than once but the second statement was > "dead" and we don't remove that until much later. [...] > OK? Bootstrapped and tested on x86_64-linux-gnu with no regressions. Since this patch, I see a bit of fallout building the Linux kernel using the adder875_defconfig: # CC arch/powerpc/kernel/ptrace/ptrace-view.o powerpc-linux-gcc -Wp,-MMD,arch/powerpc/kernel/ptrace/.ptrace-view.o.d -nostdinc -I./arch/powerpc/include -I./arch/powerpc/include/generated -I./include -I./arch/powerpc/include/uapi -I./arch/powerpc/include/generated/uapi -I./include/uapi -I./include/generated/uapi -include ./include/linux/compiler-version.h -include ./include/linux/kconfig.h -include ./include/linux/compiler_types.h -D__KERNEL__ -I ./arch/powerpc -fmacro-prefix-map=./= -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE -Werror=implicit-function-declaration -Werror=implicit-int -Werror=return-type -Wno-format-security -funsigned-char -std=gnu11 -mbig-endian -m32 -msoft-float -pipe -ffixed-r2 -mmultiple -mno-readonly-in-sdata -mcpu=860 -mno-prefixed -mno-pcrel -mno-altivec -mno-vsx -mno-mma -fno-asynchronous-unwind-tables -mno-string -mbig-endian -mstack-protector-guard=tls -mstack-protector-guard-reg=r2 -fno-delete-null-pointer-checks -Wno-frame-address -Wno-format-truncation -Wno-format-overflow -Wno-address-of-packed-member -O2 -fno-allow-store-data-races -Wframe-larger-than=1024 -fstack-protector-strong -Wno-main -Wno-unused-but-set-variable -Wno-unused-const-variable -Wno-dangling-pointer -fomit-frame-pointer -ftrivial-auto-var-init=zero -fno-stack-clash-protection -Wdeclaration-after-statement -Wvla -Wno-pointer-sign -Wcast-function-type -Wno-stringop-truncation -Wno-stringop-overflow -Wno-restrict -Wno-maybe-uninitialized -Wno-array-bounds -Wno-alloc-size-larger-than -Wimplicit-fallthrough=5 -fno-strict-overflow -fno-stack-check -fconserve-stack -Werror=date-time -Werror=incompatible-pointer-types -Werror=designated-init -Wno-packed-not-aligned -g -mstack-protector-guard-offset=544 -Werror -DUTS_MACHINE='"ppc"' -DKBUILD_MODFILE='"arch/powerpc/kernel/ptrace/ptrace-view"' -DKBUILD_BASENAME='"ptrace_view"' -DKBUILD_MODNAME='"ptrace_view"' -D__KBUILD_MODNAME=kmod_ptrace_view -c -o arch/powerpc/kernel/ptrace/ptrace-view.o arch/powerpc/kernel/ptrace/ptrace-view.c during GIMPLE pass: pre arch/powerpc/kernel/ptrace/ptrace-view.c: In function 'gpr32_set_common': arch/powerpc/kernel/ptrace/ptrace-view.c:649:5: internal compiler error: in gimple_redirect_edge_and_branch, at tree-cfg.cc:6262 649 | int gpr32_set_common(struct task_struct *target, | ^~~~~~~~~~~~~~~~ 0x1a562a6 internal_error(char const*, ...) ???:0 0x826ea1 fancy_abort(char const*, int, char const*) ???:0 0x9b77c9 redirect_edge_and_branch(edge_def*, basic_block_def*) ???:0 0x9b7e43 split_edge(edge_def*) ???:0 0xee1cc7 split_critical_edges(bool) ???:0 Please submit a full bug report, with preprocessed source (by using -freport-bug). Please include the complete backtrace with any bug report. See for instructions. make[4]: *** [scripts/Makefile.build:252: arch/powerpc/kernel/ptrace/ptrace-view.o] Error 1 make[3]: *** [scripts/Makefile.build:494: arch/powerpc/kernel/ptrace] Error 2 make[2]: *** [scripts/Makefile.build:494: arch/powerpc/kernel] Error 2 make[1]: *** [scripts/Makefile.build:494: arch/powerpc] Error 2 make: *** [Makefile:2026: .] Error 2 (Full log at http://toolchain.lug-owl.de/laminar/jobs/linux-powerpc-adder875_defconfig/100) Thanks, Jan-Benedict --