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add comment why preferred stack boundary is 4 on i386

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Denis Vlasenko 2007-07-23 21:05:06 +00:00
parent 64a8a3bd74
commit 65b8cfb2a0
1 changed files with 2 additions and 0 deletions
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arch/i386/Makefile
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@ -2,4 +2,6 @@
# Build system # Build system
# ========================================================================== # ==========================================================================
# -mpreferred-stack-boundary=2 is essential in preventing gcc 4.2.x
# from aligning stack to 16 bytes. (Which is gcc's way of supporting SSE).
CFLAGS += $(call cc-option,-march=i386 -mpreferred-stack-boundary=2,) CFLAGS += $(call cc-option,-march=i386 -mpreferred-stack-boundary=2,)