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

[oota-llvm.git] / test / CodeGen / SystemZ / fp-sub-01.ll

diff --git a/test/CodeGen/SystemZ/fp-sub-01.ll b/test/CodeGen/SystemZ/fp-sub-01.ll
index b03f04bd017efd06a5b8d7c4a31ef961219dd0ff..88ce7fb440ec0a2f7fe0b3f336d41c666dfed4a8 100644 (file)
--- a/test/CodeGen/SystemZ/fp-sub-01.ll
+++ b/test/CodeGen/SystemZ/fp-sub-01.ll
@@ -2,6 +2,8 @@
 ;
 ; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s
 
+declare float @foo()
+
 ; Check register subtraction.
 define float @f1(float %f1, float %f2) {
 ; CHECK: f1:
@@ -69,3 +71,49 @@ define float @f6(float %f1, float *%base, i64 %index) {
   %res = fsub float %f1, %f2
   ret float %res
 }
+
+; Check that subtractions of spilled values can use SEB rather than SEBR.
+define float @f7(float *%ptr0) {
+; CHECK: f7:
+; CHECK: brasl %r14, foo@PLT
+; CHECK: seb %f0, 16{{[04]}}(%r15)
+; CHECK: br %r14
+  %ptr1 = getelementptr float *%ptr0, i64 2
+  %ptr2 = getelementptr float *%ptr0, i64 4
+  %ptr3 = getelementptr float *%ptr0, i64 6
+  %ptr4 = getelementptr float *%ptr0, i64 8
+  %ptr5 = getelementptr float *%ptr0, i64 10
+  %ptr6 = getelementptr float *%ptr0, i64 12
+  %ptr7 = getelementptr float *%ptr0, i64 14
+  %ptr8 = getelementptr float *%ptr0, i64 16
+  %ptr9 = getelementptr float *%ptr0, i64 18
+  %ptr10 = getelementptr float *%ptr0, i64 20
+
+  %val0 = load float *%ptr0
+  %val1 = load float *%ptr1
+  %val2 = load float *%ptr2
+  %val3 = load float *%ptr3
+  %val4 = load float *%ptr4
+  %val5 = load float *%ptr5
+  %val6 = load float *%ptr6
+  %val7 = load float *%ptr7
+  %val8 = load float *%ptr8
+  %val9 = load float *%ptr9
+  %val10 = load float *%ptr10
+
+  %ret = call float @foo()
+
+  %sub0 = fsub float %ret, %val0
+  %sub1 = fsub float %sub0, %val1
+  %sub2 = fsub float %sub1, %val2
+  %sub3 = fsub float %sub2, %val3
+  %sub4 = fsub float %sub3, %val4
+  %sub5 = fsub float %sub4, %val5
+  %sub6 = fsub float %sub5, %val6
+  %sub7 = fsub float %sub6, %val7
+  %sub8 = fsub float %sub7, %val8
+  %sub9 = fsub float %sub8, %val9
+  %sub10 = fsub float %sub9, %val10
+
+  ret float %sub10
+}