[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-sub-02.ll b/llvm/test/CodeGen/SystemZ/fp-sub-02.ll
new file mode 100644
index 00000000000..bf9848c2fd5
--- /dev/null
+++ b/llvm/test/CodeGen/SystemZ/fp-sub-02.ll
@@ -0,0 +1,71 @@
+; Test 64-bit floating-point subtraction.
+;
+; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s
+
+; Check register subtraction.
+define double @f1(double %f1, double %f2) {
+; CHECK: f1:
+; CHECK: sdbr %f0, %f2
+; CHECK: br %r14
+  %res = fsub double %f1, %f2
+  ret double %res
+}
+
+; Check the low end of the SDB range.
+define double @f2(double %f1, double *%ptr) {
+; CHECK: f2:
+; CHECK: sdb %f0, 0(%r2)
+; CHECK: br %r14
+  %f2 = load double *%ptr
+  %res = fsub double %f1, %f2
+  ret double %res
+}
+
+; Check the high end of the aligned SDB range.
+define double @f3(double %f1, double *%base) {
+; CHECK: f3:
+; CHECK: sdb %f0, 4088(%r2)
+; CHECK: br %r14
+  %ptr = getelementptr double *%base, i64 511
+  %f2 = load double *%ptr
+  %res = fsub double %f1, %f2
+  ret double %res
+}
+
+; Check the next doubleword up, which needs separate address logic.
+; Other sequences besides this one would be OK.
+define double @f4(double %f1, double *%base) {
+; CHECK: f4:
+; CHECK: aghi %r2, 4096
+; CHECK: sdb %f0, 0(%r2)
+; CHECK: br %r14
+  %ptr = getelementptr double *%base, i64 512
+  %f2 = load double *%ptr
+  %res = fsub double %f1, %f2
+  ret double %res
+}
+
+; Check negative displacements, which also need separate address logic.
+define double @f5(double %f1, double *%base) {
+; CHECK: f5:
+; CHECK: aghi %r2, -8
+; CHECK: sdb %f0, 0(%r2)
+; CHECK: br %r14
+  %ptr = getelementptr double *%base, i64 -1
+  %f2 = load double *%ptr
+  %res = fsub double %f1, %f2
+  ret double %res
+}
+
+; Check that SDB allows indices.
+define double @f6(double %f1, double *%base, i64 %index) {
+; CHECK: f6:
+; CHECK: sllg %r1, %r3, 3
+; CHECK: sdb %f0, 800(%r1,%r2)
+; CHECK: br %r14
+  %ptr1 = getelementptr double *%base, i64 %index
+  %ptr2 = getelementptr double *%ptr1, i64 100
+  %f2 = load double *%ptr2
+  %res = fsub double %f1, %f2
+  ret double %res
+}