1 files changed, 59 insertions, 0 deletions
diff --git a/contrib/llvm-project/compiler-rt/lib/builtins/loongarch/fp_mode.c b/contrib/llvm-project/compiler-rt/lib/builtins/loongarch/fp_mode.c
new file mode 100644
index 000000000000..31877fb02bd5
--- /dev/null
+++ b/contrib/llvm-project/compiler-rt/lib/builtins/loongarch/fp_mode.c
@@ -0,0 +1,59 @@
+//=== lib/builtins/loongarch/fp_mode.c - Floaing-point mode utilities -*- C -*-===//
+//
+// 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 "../fp_mode.h"
+
+#define LOONGARCH_TONEAREST  0x0000
+#define LOONGARCH_TOWARDZERO 0x0100
+#define LOONGARCH_UPWARD     0x0200
+#define LOONGARCH_DOWNWARD   0x0300
+
+#define LOONGARCH_RMODE_MASK (LOONGARCH_TONEAREST | LOONGARCH_TOWARDZERO | \
+                              LOONGARCH_UPWARD | LOONGARCH_DOWNWARD)
+
+#define LOONGARCH_INEXACT    0x10000
+
+CRT_FE_ROUND_MODE __fe_getround(void) {
+#if __loongarch_frlen != 0
+  int fcsr;
+#  ifdef __clang__
+  __asm__ __volatile__("movfcsr2gr %0, $fcsr0" : "=r" (fcsr));
+#  else
+  __asm__ __volatile__("movfcsr2gr %0, $r0" : "=r" (fcsr));
+#  endif
+  fcsr &= LOONGARCH_RMODE_MASK;
+  switch (fcsr) {
+  case LOONGARCH_TOWARDZERO:
+    return CRT_FE_TOWARDZERO;
+  case LOONGARCH_DOWNWARD:
+    return CRT_FE_DOWNWARD;
+  case LOONGARCH_UPWARD:
+    return CRT_FE_UPWARD;
+  case LOONGARCH_TONEAREST:
+  default:
+    return CRT_FE_TONEAREST;
+  }
+#else
+  return CRT_FE_TONEAREST;
+#endif
+}
+
+int __fe_raise_inexact(void) {
+#if __loongarch_frlen != 0
+  int fcsr;
+#  ifdef __clang__
+  __asm__ __volatile__("movfcsr2gr %0, $fcsr0" : "=r" (fcsr));
+  __asm__ __volatile__(
+      "movgr2fcsr $fcsr0, %0" :: "r" (fcsr | LOONGARCH_INEXACT));
+#  else
+  __asm__ __volatile__("movfcsr2gr %0, $r0" : "=r" (fcsr));
+  __asm__ __volatile__(
+      "movgr2fcsr $r0, %0" :: "r" (fcsr | LOONGARCH_INEXACT));
+#  endif
+#endif
+  return 0;
+}