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-rw-r--r--gcc/config/i386/i386.md1
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diff --git a/gcc/config/i386/i386.md b/gcc/config/i386/i386.md
index ea77c203..9da00cc 100644
--- a/gcc/config/i386/i386.md
+++ b/gcc/config/i386/i386.md
@@ -58,6 +58,7 @@
;; X -- don't print any sort of PIC '@' suffix for a symbol.
;; & -- print some in-use local-dynamic symbol name.
;; H -- print a memory address offset by 8; used for sse high-parts
+;; K -- print HLE lock prefix
;; Y -- print condition for XOP pcom* instruction.
;; + -- print a branch hint as 'cs' or 'ds' prefix
;; ; -- print a semicolon (after prefixes due to bug in older gas).