https://bugs.kde.org/show_bug.cgi?id=523626
--- Comment #3 from [email protected] --- I've bisected the individual optimizations using -mllvm -opt-bisect-limit= (-1 to list them all - 22425 optimizations for -O3 in total) like this: $ export L=14729 $ (clang -DHAVE_CONFIG_H -I. -I.. -I.. -I../include -I../include -I../VEX/pub -I../VEX/pub -DVGA_x86=1 -DVGO_linux=1 -DVGP_x86_linux=1 -DVGPV_x86_linux_vanilla=1 -I./priv -m32 -O2 -mllvm -opt-bisect-limit=$L -g -Wall -Wmissing-prototypes -Wshadow -Wpointer-arith -Wstrict-prototypes -Wmissing-declarations -Wno-unused-result -Wcast-align -Wcast-qual -Wwrite-strings -Wempty-body -Wformat -Wformat-signedness -Wformat-security -Wignored-qualifiers -Wenum-conversion -finline-functions -fno-stack-protector -fno-strict-aliasing -fno-builtin -Wno-cast-align -Wno-self-assign -Wno-tautological-compare -fomit-frame-pointer -Wbad-function-cast -MT priv/libvex_x86_linux_a-guest_x86_toIR.o -MD -MP -MF priv/.deps/libvex_x86_linux_a-guest_x86_toIR.Tpo -c -o priv/libvex_x86_linux_a-guest_x86_toIR.o `test -f 'priv/guest_x86_toIR.c' || echo './'`priv/guest_x86_toIR.c && make -C ..) |& tee xxx.log and found the problematic optimization: BISECT: running pass (14729) slp-vectorizer on g_calc_mpsadbw And confirmed that disabling this optimization for guest_x86_toIR.c fixes the problem (... -O2 -mllvm -opt-disable=slp-vectorizer ...) specifically: $ (clang -DHAVE_CONFIG_H -I. -I.. -I.. -I../include -I../include -I../VEX/pub -I../VEX/pub -DVGA_x86=1 -DVGO_linux=1 -DVGP_x86_linux=1 -DVGPV_x86_linux_vanilla=1 -I./priv -m32 -O2 -mllvm -opt-disable=slp-vectorizer -g -Wall -Wmissing-prototypes -Wshadow -Wpointer-arith -Wstrict-prototypes -Wmissing-declarations -Wno-unused-result -Wcast-align -Wcast-qual -Wwrite-strings -Wempty-body -Wformat -Wformat-signedness -Wformat-security -Wignored-qualifiers -Wenum-conversion -finline-functions -fno-stack-protector -fno-strict-aliasing -fno-builtin -Wno-cast-align -Wno-self-assign -Wno-tautological-compare -fomit-frame-pointer -Wbad-function-cast -MT priv/libvex_x86_linux_a-guest_x86_toIR.o -MD -MP -MF priv/.deps/libvex_x86_linux_a-guest_x86_toIR.Tpo -c -o priv/libvex_x86_linux_a-guest_x86_toIR.o `test -f 'priv/guest_x86_toIR.c' || echo './'`priv/guest_x86_toIR.c && make -C ..) |& tee xxx.log That said, clang -mllvm -opt-disable=slp-vectorizer works this problem around. -- You are receiving this mail because: You are watching all bug changes.
