From 7dc9e5ade487ff2cd81c0c644f4f0953166b1375 Mon Sep 17 00:00:00 2001
From: Mike Pall <mike>
Date: Wed, 11 Jun 2014 22:44:08 +0200
Subject: [PATCH] x86: lj_math_random_step() clobbers XMM regs on OSX Clang.

---
 src/lj_ircall.h | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/lj_ircall.h b/src/lj_ircall.h
index af30ba8f..92d61dfa 100644
--- a/src/lj_ircall.h
+++ b/src/lj_ircall.h
@@ -86,6 +86,12 @@ typedef struct CCallInfo {
 #define IRCALLCOND_FFI32(x)		NULL
 #endif
 
+#if LJ_TARGET_X86
+#define CCI_RANDFPR	0	/* Clang on OSX/x86 is overzealous. */
+#else
+#define CCI_RANDFPR	CCI_NOFPRCLOBBER
+#endif
+
 #if LJ_SOFTFP
 #define ARG1_FP		2	/* Treat as 2 32 bit arguments. */
 #else
@@ -112,7 +118,7 @@ typedef struct CCallInfo {
   _(ANY,	lj_gc_step_jit,		2,  FS, NIL, CCI_L) \
   _(ANY,	lj_gc_barrieruv,	2,  FS, NIL, 0) \
   _(ANY,	lj_mem_newgco,		2,  FS, P32, CCI_L) \
-  _(ANY,	lj_math_random_step, 1, FS, NUM, CCI_CASTU64|CCI_NOFPRCLOBBER) \
+  _(ANY,	lj_math_random_step, 1, FS, NUM, CCI_CASTU64|CCI_RANDFPR)\
   _(ANY,	lj_vm_modi,		2,  FN, INT, 0) \
   _(ANY,	sinh,			ARG1_FP,  N, NUM, 0) \
   _(ANY,	cosh,			ARG1_FP,  N, NUM, 0) \