--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/CodeGen/SystemZ/fp-sub-01.ll	Thu Dec 12 13:56:28 2013 +0900
@@ -0,0 +1,119 @@
+; Test 32-bit floating-point subtraction.
+;
+; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s
+
+declare float @foo()
+
+; Check register subtraction.
+define float @f1(float %f1, float %f2) {
+; CHECK-LABEL: f1:
+; CHECK: sebr %f0, %f2
+; CHECK: br %r14
+  %res = fsub float %f1, %f2
+  ret float %res
+}
+
+; Check the low end of the SEB range.
+define float @f2(float %f1, float *%ptr) {
+; CHECK-LABEL: f2:
+; CHECK: seb %f0, 0(%r2)
+; CHECK: br %r14
+  %f2 = load float *%ptr
+  %res = fsub float %f1, %f2
+  ret float %res
+}
+
+; Check the high end of the aligned SEB range.
+define float @f3(float %f1, float *%base) {
+; CHECK-LABEL: f3:
+; CHECK: seb %f0, 4092(%r2)
+; CHECK: br %r14
+  %ptr = getelementptr float *%base, i64 1023
+  %f2 = load float *%ptr
+  %res = fsub float %f1, %f2
+  ret float %res
+}
+
+; Check the next word up, which needs separate address logic.
+; Other sequences besides this one would be OK.
+define float @f4(float %f1, float *%base) {
+; CHECK-LABEL: f4:
+; CHECK: aghi %r2, 4096
+; CHECK: seb %f0, 0(%r2)
+; CHECK: br %r14
+  %ptr = getelementptr float *%base, i64 1024
+  %f2 = load float *%ptr
+  %res = fsub float %f1, %f2
+  ret float %res
+}
+
+; Check negative displacements, which also need separate address logic.
+define float @f5(float %f1, float *%base) {
+; CHECK-LABEL: f5:
+; CHECK: aghi %r2, -4
+; CHECK: seb %f0, 0(%r2)
+; CHECK: br %r14
+  %ptr = getelementptr float *%base, i64 -1
+  %f2 = load float *%ptr
+  %res = fsub float %f1, %f2
+  ret float %res
+}
+
+; Check that SEB allows indices.
+define float @f6(float %f1, float *%base, i64 %index) {
+; CHECK-LABEL: f6:
+; CHECK: sllg %r1, %r3, 2
+; CHECK: seb %f0, 400(%r1,%r2)
+; CHECK: br %r14
+  %ptr1 = getelementptr float *%base, i64 %index
+  %ptr2 = getelementptr float *%ptr1, i64 100
+  %f2 = load float *%ptr2
+  %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-LABEL: 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
+}