1 files changed, 111 insertions, 0 deletions
diff --git a/test/CodeGen/X86/fp-intrinsics.ll b/test/CodeGen/X86/fp-intrinsics.ll
new file mode 100644
index 0000000000000..88aef6bb06599
--- /dev/null
+++ b/test/CodeGen/X86/fp-intrinsics.ll
@@ -0,0 +1,111 @@
+; RUN: llc -O3 -mtriple=x86_64-pc-linux < %s | FileCheck %s
+
+; Verify that constants aren't folded to inexact results when the rounding mode
+; is unknown.
+;
+; double f1() {
+;   // Because 0.1 cannot be represented exactly, this shouldn't be folded.
+;   return 1.0/10.0;
+; }
+;
+; CHECK-LABEL: f1
+; CHECK: divsd
+define double @f1() {
+entry:
+  %div = call double @llvm.experimental.constrained.fdiv.f64(
+                                               double 1.000000e+00,
+                                               double 1.000000e+01,
+                                               metadata !"round.dynamic",
+                                               metadata !"fpexcept.strict")
+  ret double %div
+}
+
+; Verify that 'a - 0' isn't simplified to 'a' when the rounding mode is unknown.
+;
+; double f2(double a) {
+;   // Because the result of '0 - 0' is negative zero if rounding mode is
+;   // downward, this shouldn't be simplified.
+;   return a - 0;
+; }
+;
+; CHECK-LABEL: f2
+; CHECK:  subsd
+define double @f2(double %a) {
+entry:
+  %div = call double @llvm.experimental.constrained.fsub.f64(
+                                               double %a,
+                                               double 0.000000e+00,
+                                               metadata !"round.dynamic",
+                                               metadata !"fpexcept.strict")
+  ret double %div
+}
+
+; Verify that '-((-a)*b)' isn't simplified to 'a*b' when the rounding mode is
+; unknown.
+;
+; double f3(double a, double b) {
+;   // Because the intermediate value involved in this calculation may require
+;   // rounding, this shouldn't be simplified.
+;   return -((-a)*b);
+; }
+;
+; CHECK-LABEL: f3:
+; CHECK:  subsd
+; CHECK:  mulsd
+; CHECK:  subsd
+define double @f3(double %a, double %b) {
+entry:
+  %sub = call double @llvm.experimental.constrained.fsub.f64(
+                                               double -0.000000e+00, double %a,
+                                               metadata !"round.dynamic",
+                                               metadata !"fpexcept.strict")
+  %mul = call double @llvm.experimental.constrained.fmul.f64(
+                                               double %sub, double %b,
+                                               metadata !"round.dynamic",
+                                               metadata !"fpexcept.strict")
+  %ret = call double @llvm.experimental.constrained.fsub.f64(
+                                               double -0.000000e+00,
+                                               double %mul,
+                                               metadata !"round.dynamic",
+                                               metadata !"fpexcept.strict")
+  ret double %ret
+}
+
+; Verify that FP operations are not performed speculatively when FP exceptions
+; are not being ignored.
+;
+; double f4(int n, double a) {
+;   // Because a + 1 may overflow, this should not be simplified.
+;   if (n > 0)
+;     return a + 1.0;
+;   return a;
+; }
+;
+; 
+; CHECK-LABEL: f4:
+; CHECK: testl
+; CHECK: jle
+; CHECK: addsd
+define double @f4(i32 %n, double %a) {
+entry:
+  %cmp = icmp sgt i32 %n, 0
+  br i1 %cmp, label %if.then, label %if.end
+
+if.then:
+  %add = call double @llvm.experimental.constrained.fadd.f64(
+                                               double 1.000000e+00, double %a,
+                                               metadata !"round.dynamic",
+                                               metadata !"fpexcept.strict")
+  br label %if.end
+
+if.end:
+  %a.0 = phi double [%add, %if.then], [ %a, %entry ]
+  ret double %a.0
+}
+
+
+@llvm.fp.env = thread_local global i8 zeroinitializer, section "llvm.metadata"
+declare double @llvm.experimental.constrained.fdiv.f64(double, double, metadata, metadata)
+declare double @llvm.experimental.constrained.fmul.f64(double, double, metadata, metadata)
+declare double @llvm.experimental.constrained.fadd.f64(double, double, metadata, metadata)
+declare double @llvm.experimental.constrained.fsub.f64(double, double, metadata, metadata)