aaron.ballman added inline comments.
================ Comment at: include/clang/Basic/AttrDocs.td:2812 +Legacy x86 code uses 4-byte stack alignment. Newer aligned SSE instructions +(like 'movaps') that work with stack require operands to be 16-byte aligned. +This attribute realigns stack in the function prologue to make sure the stack ---------------- work with stack -> work with the stack ================ Comment at: include/clang/Basic/AttrDocs.td:2813 +(like 'movaps') that work with stack require operands to be 16-byte aligned. +This attribute realigns stack in the function prologue to make sure the stack +can be used with SSE instructions. ---------------- realigns stack -> realigns the stack ================ Comment at: include/clang/Basic/AttrDocs.td:2817 +Note that the x86_64 ABI forces 16-byte stack alignment at the call site. +Because of this, 'force_align_arg_pointer' is not needed at x86_64 except rare +cases when caller does not align the stack correctly (e.g. flow jumps from i386 ---------------- at x86_64 except rare cases when caller -> on x86_64, except in rare cases where the caller https://reviews.llvm.org/D37312 _______________________________________________ cfe-commits mailing list cfe-commits@lists.llvm.org http://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
