From 11db3838a8cbfd09ecca368e87305054832a4719 Mon Sep 17 00:00:00 2001
From: xleroy <xleroy@fca1b0fc-160b-0410-b1d3-a4f43f01ea2e>
Date: Sun, 23 Feb 2014 08:23:10 +0000
Subject: In Regalloc, dead code elimination, don't eliminate move operations
 that pop the x87 FP stack (var <- FP0).  Otherwise, (void) f(); where f
 returns a float eventually produces a FP stack overflow.

git-svn-id: https://yquem.inria.fr/compcert/svn/compcert/trunk@2416 fca1b0fc-160b-0410-b1d3-a4f43f01ea2e
---
 backend/XTL.ml | 6 ++++++
 1 file changed, 6 insertions(+)

(limited to 'backend/XTL.ml')

diff --git a/backend/XTL.ml b/backend/XTL.ml
index 46c59b0..9cb8e0a 100644
--- a/backend/XTL.ml
+++ b/backend/XTL.ml
@@ -64,6 +64,12 @@ let vlocs ll = List.map vloc ll
 let vmreg mr = L(R mr)
 let vmregs mrl = List.map vmreg mrl
 
+(* Tests over variables *)
+
+let is_stack_reg = function
+  | L(R r) -> Machregs.is_stack_reg r
+  | _      -> false
+
 (* Sets of variables *)
 
 module VSet = Set.Make(struct type t = var let compare = compare end)
-- 
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