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Diffstat (limited to 'docs')
| -rw-r--r-- | docs/LangRef.html | 16 |
1 files changed, 10 insertions, 6 deletions
diff --git a/docs/LangRef.html b/docs/LangRef.html index 236538d3e4..f3e5d9f2e1 100644 --- a/docs/LangRef.html +++ b/docs/LangRef.html @@ -2339,9 +2339,9 @@ has undefined behavior.</p> a special value. This value represents the inline assembler as a string (containing the instructions to emit), a list of operand constraints (stored as a string), a flag that indicates whether or not the inline asm - expression has side effects, and a flag indicating whether the asm came - originally from an asm block. An example inline assembler - expression is:</p> + expression has side effects, and a flag indicating whether the function + containing the asm needs to align its stack conservatively. An example + inline assembler expression is:</p> <div class="doc_code"> <pre> @@ -2369,12 +2369,16 @@ call void asm sideeffect "eieio", ""() </pre> </div> -<p>Inline asms derived from asm blocks are similarly marked with the - '<tt>msasm</tt>' keyword:</p> +<p>In some cases inline asms will contain code that will not work unless the + stack is aligned in some way, such as calls or SSE instructions on x86, + yet will not contain code that does that alignment within the asm. + The compiler should make conservative assumptions about what the asm might + contain and should generate its usual stack alignment code in the prologue + if the '<tt>alignstack</tt>' keyword is present:</p> <div class="doc_code"> <pre> -call void asm msasm "eieio", ""() +call void asm alignstack "eieio", ""() </pre> </div> |