[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.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@181204 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 89 insertions, 0 deletions

diff --git a/test/CodeGen/SystemZ/fp-conv-03.ll b/test/CodeGen/SystemZ/fp-conv-03.ll
new file mode 100644
index 0000000000..703a141e3e
--- /dev/null
+++ b/test/CodeGen/SystemZ/fp-conv-03.ll
@@ -0,0 +1,89 @@
+; Test extensions of f32 to f128.
+;
+; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s
+
+; Check register extension.
+define void @f1(fp128 *%dst, float %val) {
+; CHECK: f1:
+; CHECK: lxebr %f0, %f0
+; CHECK: std %f0, 0(%r2)
+; CHECK: std %f2, 8(%r2)
+; CHECK: br %r14
+  %res = fpext float %val to fp128
+  store fp128 %res, fp128 *%dst
+  ret void
+}
+
+; Check the low end of the LXEB range.
+define void @f2(fp128 *%dst, float *%ptr) {
+; CHECK: f2:
+; CHECK: lxeb %f0, 0(%r3)
+; CHECK: std %f0, 0(%r2)
+; CHECK: std %f2, 8(%r2)
+; CHECK: br %r14
+  %val = load float *%ptr
+  %res = fpext float %val to fp128
+  store fp128 %res, fp128 *%dst
+  ret void
+}
+
+; Check the high end of the aligned LXEB range.
+define void @f3(fp128 *%dst, float *%base) {
+; CHECK: f3:
+; CHECK: lxeb %f0, 4092(%r3)
+; CHECK: std %f0, 0(%r2)
+; CHECK: std %f2, 8(%r2)
+; CHECK: br %r14
+  %ptr = getelementptr float *%base, i64 1023
+  %val = load float *%ptr
+  %res = fpext float %val to fp128
+  store fp128 %res, fp128 *%dst
+  ret void
+}
+
+; Check the next word up, which needs separate address logic.
+; Other sequences besides this one would be OK.
+define void @f4(fp128 *%dst, float *%base) {
+; CHECK: f4:
+; CHECK: aghi %r3, 4096
+; CHECK: lxeb %f0, 0(%r3)
+; CHECK: std %f0, 0(%r2)
+; CHECK: std %f2, 8(%r2)
+; CHECK: br %r14
+  %ptr = getelementptr float *%base, i64 1024
+  %val = load float *%ptr
+  %res = fpext float %val to fp128
+  store fp128 %res, fp128 *%dst
+  ret void
+}
+
+; Check negative displacements, which also need separate address logic.
+define void @f5(fp128 *%dst, float *%base) {
+; CHECK: f5:
+; CHECK: aghi %r3, -4
+; CHECK: lxeb %f0, 0(%r3)
+; CHECK: std %f0, 0(%r2)
+; CHECK: std %f2, 8(%r2)
+; CHECK: br %r14
+  %ptr = getelementptr float *%base, i64 -1
+  %val = load float *%ptr
+  %res = fpext float %val to fp128
+  store fp128 %res, fp128 *%dst
+  ret void
+}
+
+; Check that LXEB allows indices.
+define void @f6(fp128 *%dst, float *%base, i64 %index) {
+; CHECK: f6:
+; CHECK: sllg %r1, %r4, 2
+; CHECK: lxeb %f0, 400(%r1,%r3)
+; CHECK: std %f0, 0(%r2)
+; CHECK: std %f2, 8(%r2)
+; CHECK: br %r14
+  %ptr1 = getelementptr float *%base, i64 %index
+  %ptr2 = getelementptr float *%ptr1, i64 100
+  %val = load float *%ptr2
+  %res = fpext float %val to fp128
+  store fp128 %res, fp128 *%dst
+  ret void
+}