1 files changed, 34 insertions, 0 deletions
diff --git a/contrib/llvm-project/compiler-rt/lib/builtins/i386/floatdixf.S b/contrib/llvm-project/compiler-rt/lib/builtins/i386/floatdixf.S
new file mode 100644
index 000000000000..486e3b004fa3
--- /dev/null
+++ b/contrib/llvm-project/compiler-rt/lib/builtins/i386/floatdixf.S
@@ -0,0 +1,34 @@
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+
+#include "../assembly.h"
+
+// xf_float __floatdixf(di_int a);
+
+#ifdef __i386__
+
+// This routine has some extra memory traffic, loading the 64-bit input via two
+// 32-bit loads, then immediately storing it back to the stack via a single 64-bit
+// store.  This is to avoid a write-small, read-large stall.
+// However, if callers of this routine can be safely assumed to store the argument
+// via a 64-bt store, this is unnecessary memory traffic, and should be avoided.
+// It can be turned off by defining the TRUST_CALLERS_USE_64_BIT_STORES macro.
+
+.text
+.balign 4
+DEFINE_COMPILERRT_FUNCTION(__floatdixf)
+#ifndef TRUST_CALLERS_USE_64_BIT_STORES
+	movd		4(%esp),	%xmm0
+	movd		8(%esp),	%xmm1
+	punpckldq	%xmm1,		%xmm0
+	movq		%xmm0,		4(%esp)
+#endif
+	fildll		4(%esp)
+	ret
+END_COMPILERRT_FUNCTION(__floatdixf)
+
+#endif // __i386__
+
+NO_EXEC_STACK_DIRECTIVE
+