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2005-09-23 Alexandre Oliva <aoliva@redhat.com>
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* config/rs6000/sysv4.h (PREFERRED_STACK_BOUNDARY): New,
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same as STACK_BOUNDARY as in rs6000.h.
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--- gcc/config/rs6000/sysv4.h.orig
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+++ gcc/config/rs6000/sysv4.h
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@@ -395,6 +395,22 @@ do { \
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#undef STACK_BOUNDARY
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#define STACK_BOUNDARY (TARGET_ALTIVEC_ABI ? 128 : 64)
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+/* The definition above is actually wrong, since it doesn't use
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+ 128-bit alignment on ppc64 like the ABI mandates. It was removed
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+ in newer versions of GCC. The correct definition would be the one
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+ below, from rs6000.h. Unfortunately, changing it would increase
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+ the stack alignment expectations of newly-compiled functions, that
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+ might be called by functions compiled with the old compiler. If
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+ the latter didn't keep the stack sufficiently aligned. This may
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+ happen if the latter uses alloca() or dynamically-sized arrays. We
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+ compensate for the error here, getting the compiler to keep the
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+ stack aligned to the correct boundary, but not assuming it is
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+ sufficiently aligned. Code that still assumes proper alignment
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+ will fail and require recompilation with this patch or a newer
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+ compiler, but most of the code will work without change. */
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+#define PREFERRED_STACK_BOUNDARY \
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+ ((TARGET_32BIT && !TARGET_ALTIVEC_ABI) ? 64 : 128)
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+
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/* Real stack boundary as mandated by the appropriate ABI. */
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#define ABI_STACK_BOUNDARY ((TARGET_EABI && !TARGET_ALTIVEC_ABI) ? 64 : 128)
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