1 files changed, 31 insertions, 0 deletions
diff --git a/test/CodeGen/X86/fp-double-rounding.ll b/test/CodeGen/X86/fp-double-rounding.ll
new file mode 100644
index 0000000..030cb9a
--- /dev/null
+++ b/test/CodeGen/X86/fp-double-rounding.ll
@@ -0,0 +1,31 @@
+; RUN: llc < %s | FileCheck %s --check-prefix=CHECK --check-prefix=SAFE
+; RUN: llc < %s -enable-unsafe-fp-math | FileCheck %s --check-prefix=CHECK --check-prefix=UNSAFE
+
+target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64--"
+
+; CHECK-LABEL: double_rounding:
+; SAFE: callq __trunctfdf2
+; SAFE-NEXT: cvtsd2ss %xmm0
+; UNSAFE: callq __trunctfsf2
+; UNSAFE-NOT: cvt
+define void @double_rounding(fp128* %x, float* %f) {
+entry:
+  %0 = load fp128* %x, align 16
+  %1 = fptrunc fp128 %0 to double
+  %2 = fptrunc double %1 to float
+  store float %2, float* %f, align 4
+  ret void
+}
+
+; CHECK-LABEL: double_rounding_precise_first:
+; CHECK: fstps (%
+; CHECK-NOT: fstpl
+define void @double_rounding_precise_first(float* %f) {
+entry:
+  ; Hack, to generate a precise FP_ROUND to double
+  %precise = call double asm sideeffect "fld %st(0)", "={st(0)}"()
+  %0 = fptrunc double %precise to float
+  store float %0, float* %f, align 4
+  ret void
+}