It is one of the optimizations introduced by -O3 as this compiles:
g++ -MP -MMD -MF
derived/arm-linux-opt/dep/sound/YMF262.d -O2 -ffast-math -funroll-loops -o
derived/arm-linux-opt/obj/sound/YMF262.o -DNDEBUG -pipe -Wall -Isrc -Isrc/cpu
-Isrc/fdc -Isrc/ide -Isrc/file -Isrc/console -Isrc/input -Isrc/sound
-Isrc/video -Isrc/video/v9990 -Isrc/config -Isrc/commands -Isrc/debugger
-Isrc/events -Isrc/cassette -Isrc/memory -Isrc/serial -Isrc/thread
-Isrc/settings -Iderived/arm-linux-opt/config -I/usr/X11R6/include
-I/usr/include/libpng12 -I/usr/include/SDL -D_GNU_SOURCE=1 -D_REENTRANT
-I/usr/include/SDL -D_GNU_SOURCE=1 -D_REENTRANT -I/usr/include/tcl8.4
-I/usr/include/libxml2 -c
src/sound/YMF262.cc
while this:
g++ -MP -MMD -MF derived/arm-linux-opt/dep/sound/YMF262.d -O3 -o
derived/arm-linux-opt/obj/sound/YMF262.o -DNDEBUG -pipe -Wall -Isrc -Isrc/cpu
-Isrc/fdc -Isrc/ide -Isrc/file -Isrc/console -Isrc/input -Isrc/sound
-Isrc/video -Isrc/video/v9990 -Isrc/config -Isrc/commands -Isrc/debugger
-Isrc/events -Isrc/cassette -Isrc/memory -Isrc/serial -Isrc/thread
-Isrc/settings -Iderived/arm-linux-opt/config -I/usr/X11R6/include
-I/usr/include/libpng12 -I/usr/include/SDL -D_GNU_SOURCE=1 -D_REENTRANT
-I/usr/include/SDL -D_GNU_SOURCE=1 -D_REENTRANT -I/usr/include/tcl8.4
-I/usr/include/libxml2 -c
src/sound/YMF262.cc
{standard input}: Assembler messages:
{standard input}:6224: Error: bad immediate value for offset (4104)
Doesn't.
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