[SystemZ] Add CodeGen test cases

This adds all CodeGen tests for the SystemZ target.

This version of the patch incorporates feedback from a review by
Sean Silva.  Thanks to all reviewers!

Patch by Richard Sandiford.

llvm-svn: 181204

1 files changed, 71 insertions, 0 deletions

diff --git a/llvm/test/CodeGen/SystemZ/fp-div-01.ll b/llvm/test/CodeGen/SystemZ/fp-div-01.ll
new file mode 100644
index 00000000000..080d45eb2bf
--- /dev/null
+++ b/llvm/test/CodeGen/SystemZ/fp-div-01.ll
@@ -0,0 +1,71 @@
+; Test 32-bit floating-point division.
+;
+; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s
+
+; Check register division.
+define float @f1(float %f1, float %f2) {
+; CHECK: f1:
+; CHECK: debr %f0, %f2
+; CHECK: br %r14
+  %res = fdiv float %f1, %f2
+  ret float %res
+}
+
+; Check the low end of the DEB range.
+define float @f2(float %f1, float *%ptr) {
+; CHECK: f2:
+; CHECK: deb %f0, 0(%r2)
+; CHECK: br %r14
+  %f2 = load float *%ptr
+  %res = fdiv float %f1, %f2
+  ret float %res
+}
+
+; Check the high end of the aligned DEB range.
+define float @f3(float %f1, float *%base) {
+; CHECK: f3:
+; CHECK: deb %f0, 4092(%r2)
+; CHECK: br %r14
+  %ptr = getelementptr float *%base, i64 1023
+  %f2 = load float *%ptr
+  %res = fdiv 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: f4:
+; CHECK: aghi %r2, 4096
+; CHECK: deb %f0, 0(%r2)
+; CHECK: br %r14
+  %ptr = getelementptr float *%base, i64 1024
+  %f2 = load float *%ptr
+  %res = fdiv float %f1, %f2
+  ret float %res
+}
+
+; Check negative displacements, which also need separate address logic.
+define float @f5(float %f1, float *%base) {
+; CHECK: f5:
+; CHECK: aghi %r2, -4
+; CHECK: deb %f0, 0(%r2)
+; CHECK: br %r14
+  %ptr = getelementptr float *%base, i64 -1
+  %f2 = load float *%ptr
+  %res = fdiv float %f1, %f2
+  ret float %res
+}
+
+; Check that DEB allows indices.
+define float @f6(float %f1, float *%base, i64 %index) {
+; CHECK: f6:
+; CHECK: sllg %r1, %r3, 2
+; CHECK: deb %f0, 400(%r1,%r2)
+; CHECK: br %r14
+  %ptr1 = getelementptr float *%base, i64 %index
+  %ptr2 = getelementptr float *%ptr1, i64 100
+  %f2 = load float *%ptr2
+  %res = fdiv float %f1, %f2
+  ret float %res
+}