[Bug 3533] HotSpot generates code with unaligned stack, crashes on SSE operations

[bugzilla-daemon at icedtea.classpath.org]

https://icedtea.classpath.org/bugzilla/show_bug.cgi?id=3533

--- Comment #14 from Andrew John Hughes <gnu.andrew at redhat.com> ---
I did just find that -mstack-alignment=16 was introduced for Clang only with
JDK-8015252: Enable HotSpot build with Clang.

ifeq ($(USE_CLANG), true)
  # Before Clang 3.1, we had to pass the stack alignment specification directly
to llvm with the help of '-mllvm'               
  # Starting with version 3.1, Clang understands the '-mstack-alignment' (and
rejects '-mllvm -stack-alignment')                
  ifneq "$(shell expr \( $(CC_VER_MAJOR) \> 3 \) \| \( \( $(CC_VER_MAJOR) = 3
\) \& \( $(CC_VER_MINOR) \>= 1 \) \))" "0"
    STACK_ALIGNMENT_OPT = -mno-omit-leaf-frame-pointer -mstack-alignment=16
  else
    STACK_ALIGNMENT_OPT = -mno-omit-leaf-frame-pointer -mllvm
-stack-alignment=16
  endif
endif

In OpenJDK 11, it's instead restricted to Mac OS X builds:

../jdk/make/hotspot/lib/CompileLibjsig.gmk:      LIBJSIG_CFLAGS := -m64
-D_GNU_SOURCE -pthread -mno-omit-leaf-frame-pointer -mstack-alignment=16 -fPIC
../jdk/make/autoconf/flags-other.m4:    JVM_BASIC_ASFLAGS="-x
assembler-with-cpp -mno-omit-leaf-frame-pointer -mstack-alignment=16"
../jdk/make/autoconf/flags-ldflags.m4:   
BASIC_LDFLAGS_JVM_ONLY="-mno-omit-leaf-frame-pointer -mstack-alignment=16 \
../jdk/make/autoconf/flags-cflags.m4:    OS_CFLAGS_JVM="$OS_CFLAGS_JVM
-mno-omit-leaf-frame-pointer -mstack-alignment=16"
../jdk/make/lib/Lib-jdk.hotspot.agent.gmk:      -mstack-alignment=16 -fPIC

I can't find any explanation of why this was added.

Does the value 16 also work for you with gcc?

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