From e3d2ebac115f7b7899664fefc2652fb829acfa27 Mon Sep 17 00:00:00 2001
From: José Fonseca <jfonseca@vmware.com>
Date: Thu, 22 Jul 2010 18:37:46 +0100
Subject: llvmpipe: Avoid corrupting the FPU stack with MMX instructions on
 32bit OSes.

Unfortunately LLVM doesn't emit EMMS itself, and there is no
easy/effective way to disable MMX.

http://llvm.org/bugs/show_bug.cgi?id=3287
---
 src/gallium/drivers/llvmpipe/lp_state_fs.c | 5 +++++
 1 file changed, 5 insertions(+)

(limited to 'src/gallium/drivers/llvmpipe/lp_state_fs.c')

diff --git a/src/gallium/drivers/llvmpipe/lp_state_fs.c b/src/gallium/drivers/llvmpipe/lp_state_fs.c
index 5953d690a4..dbcc286417 100644
--- a/src/gallium/drivers/llvmpipe/lp_state_fs.c
+++ b/src/gallium/drivers/llvmpipe/lp_state_fs.c
@@ -676,6 +676,11 @@ generate_fragment(struct llvmpipe_context *lp,
 		     color_ptr);
    }
 
+#ifdef PIPE_ARCH_X86
+   /* Avoid corrupting the FPU stack on 32bit OSes. */
+   lp_build_intrinsic(builder, "llvm.x86.mmx.emms", LLVMVoidType(), NULL, 0);
+#endif
+
    LLVMBuildRetVoid(builder);
 
    LLVMDisposeBuilder(builder);
-- 
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