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Avoid mem cmp mem in trans even though it's an X86ism becase we don't always catch it later on.

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This commit is contained in:
Roy Frostig
2010-08-03 17:42:22 -07:00
parent a1ecdb103d
commit 7b91933eed
1 changed files with 11 additions and 1 deletions
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src/boot/me/trans.ml
+11 -1
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@@ -625,7 +625,17 @@ let trans_visitor
let op_b = sub_sz b in
let tmp = next_vreg_cell word_sty in
mov tmp op_a;
emit (Il.cmp op_a op_b);
(*
* FIXME: X86-ism going via a vreg; mem op= mem doesn't
* work and IL lacks sufficient brains to cope just now.
* Instead, should be
*
* emit (Il.cmp op_a op_b)
*
* Luckily this isn't the worst hack since we already
* needed a tmp vreg for op_a.
*)
emit (Il.cmp (Il.Cell tmp) op_b);
let jmp = mark () in
emit (Il.jmp Il.JAE Il.CodeNone);
mov tmp op_b;