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-rw-r--r--compiler/nativeGen/X86/Instr.hs4
1 files changed, 3 insertions, 1 deletions
diff --git a/compiler/nativeGen/X86/Instr.hs b/compiler/nativeGen/X86/Instr.hs
index 9f4a25b23e..bddd4fdc74 100644
--- a/compiler/nativeGen/X86/Instr.hs
+++ b/compiler/nativeGen/X86/Instr.hs
@@ -325,7 +325,9 @@ data Instr
[Maybe JumpDest] -- Targets of the jump table
Section -- Data section jump table should be put in
CLabel -- Label of jump table
- | CALL (Either Imm Reg) [Reg]
+ -- | X86 call instruction
+ | CALL (Either Imm Reg) -- ^ Jump target
+ [Reg] -- ^ Arguments (required for register allocation)
-- Other things.
| CLTD Format -- sign extend %eax into %edx:%eax