Don't use a potentially expensive shift if all we want is one set bit.

[oota-llvm.git] / test / CodeGen / SystemZ / fp-sqrt-02.ll

diff --git a/test/CodeGen/SystemZ/fp-sqrt-02.ll b/test/CodeGen/SystemZ/fp-sqrt-02.ll
index 22a91ad2f4f79e8bc08ab7cea80807bf8225757c..e90f7a369e945124b7c585bd706cba39fb86625a 100644 (file)
--- a/test/CodeGen/SystemZ/fp-sqrt-02.ll
+++ b/test/CodeGen/SystemZ/fp-sqrt-02.ll
@@ -71,3 +71,84 @@ define double @f6(double *%base, i64 %index) {
   %res = call double @llvm.sqrt.f64(double %val)
   ret double %res
 }
+
+; Test a case where we spill the source of at least one SQDBR.  We want
+; to use SQDB if possible.
+define void @f7(double *%ptr) {
+; CHECK: f7:
+; CHECK: sqdb {{%f[0-9]+}}, 160(%r15)
+; CHECK: br %r14
+  %val0 = load volatile double *%ptr
+  %val1 = load volatile double *%ptr
+  %val2 = load volatile double *%ptr
+  %val3 = load volatile double *%ptr
+  %val4 = load volatile double *%ptr
+  %val5 = load volatile double *%ptr
+  %val6 = load volatile double *%ptr
+  %val7 = load volatile double *%ptr
+  %val8 = load volatile double *%ptr
+  %val9 = load volatile double *%ptr
+  %val10 = load volatile double *%ptr
+  %val11 = load volatile double *%ptr
+  %val12 = load volatile double *%ptr
+  %val13 = load volatile double *%ptr
+  %val14 = load volatile double *%ptr
+  %val15 = load volatile double *%ptr
+  %val16 = load volatile double *%ptr
+
+  %sqrt0 = call double @llvm.sqrt.f64(double %val0)
+  %sqrt1 = call double @llvm.sqrt.f64(double %val1)
+  %sqrt2 = call double @llvm.sqrt.f64(double %val2)
+  %sqrt3 = call double @llvm.sqrt.f64(double %val3)
+  %sqrt4 = call double @llvm.sqrt.f64(double %val4)
+  %sqrt5 = call double @llvm.sqrt.f64(double %val5)
+  %sqrt6 = call double @llvm.sqrt.f64(double %val6)
+  %sqrt7 = call double @llvm.sqrt.f64(double %val7)
+  %sqrt8 = call double @llvm.sqrt.f64(double %val8)
+  %sqrt9 = call double @llvm.sqrt.f64(double %val9)
+  %sqrt10 = call double @llvm.sqrt.f64(double %val10)
+  %sqrt11 = call double @llvm.sqrt.f64(double %val11)
+  %sqrt12 = call double @llvm.sqrt.f64(double %val12)
+  %sqrt13 = call double @llvm.sqrt.f64(double %val13)
+  %sqrt14 = call double @llvm.sqrt.f64(double %val14)
+  %sqrt15 = call double @llvm.sqrt.f64(double %val15)
+  %sqrt16 = call double @llvm.sqrt.f64(double %val16)
+
+  store volatile double %val0, double *%ptr
+  store volatile double %val1, double *%ptr
+  store volatile double %val2, double *%ptr
+  store volatile double %val3, double *%ptr
+  store volatile double %val4, double *%ptr
+  store volatile double %val5, double *%ptr
+  store volatile double %val6, double *%ptr
+  store volatile double %val7, double *%ptr
+  store volatile double %val8, double *%ptr
+  store volatile double %val9, double *%ptr
+  store volatile double %val10, double *%ptr
+  store volatile double %val11, double *%ptr
+  store volatile double %val12, double *%ptr
+  store volatile double %val13, double *%ptr
+  store volatile double %val14, double *%ptr
+  store volatile double %val15, double *%ptr
+  store volatile double %val16, double *%ptr
+
+  store volatile double %sqrt0, double *%ptr
+  store volatile double %sqrt1, double *%ptr
+  store volatile double %sqrt2, double *%ptr
+  store volatile double %sqrt3, double *%ptr
+  store volatile double %sqrt4, double *%ptr
+  store volatile double %sqrt5, double *%ptr
+  store volatile double %sqrt6, double *%ptr
+  store volatile double %sqrt7, double *%ptr
+  store volatile double %sqrt8, double *%ptr
+  store volatile double %sqrt9, double *%ptr
+  store volatile double %sqrt10, double *%ptr
+  store volatile double %sqrt11, double *%ptr
+  store volatile double %sqrt12, double *%ptr
+  store volatile double %sqrt13, double *%ptr
+  store volatile double %sqrt14, double *%ptr
+  store volatile double %sqrt15, double *%ptr
+  store volatile double %sqrt16, double *%ptr
+
+  ret void
+}