[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, 103 insertions, 0 deletions

diff --git a/test/CodeGen/SystemZ/fp-mul-04.ll b/test/CodeGen/SystemZ/fp-mul-04.ll
new file mode 100644
index 0000000..712ead8
--- /dev/null
+++ b/test/CodeGen/SystemZ/fp-mul-04.ll
@@ -0,0 +1,103 @@
+; Test multiplication of two f64s, producing an f128 result.
+;
+; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s
+
+; Check register multiplication.  "mxdbr %f0, %f2" is not valid from LLVM's
+; point of view, because %f2 is the low register of the FP128 %f0.  Pass the
+; multiplier in %f4 instead.
+define void @f1(double %f1, double %dummy, double %f2, fp128 *%dst) {
+; CHECK: f1:
+; CHECK: mxdbr %f0, %f4
+; CHECK: std %f0, 0(%r2)
+; CHECK: std %f2, 8(%r2)
+; CHECK: br %r14
+  %f1x = fpext double %f1 to fp128
+  %f2x = fpext double %f2 to fp128
+  %res = fmul fp128 %f1x, %f2x
+  store fp128 %res, fp128 *%dst
+  ret void
+}
+
+; Check the low end of the MXDB range.
+define void @f2(double %f1, double *%ptr, fp128 *%dst) {
+; CHECK: f2:
+; CHECK: mxdb %f0, 0(%r2)
+; CHECK: std %f0, 0(%r3)
+; CHECK: std %f2, 8(%r3)
+; CHECK: br %r14
+  %f2 = load double *%ptr
+  %f1x = fpext double %f1 to fp128
+  %f2x = fpext double %f2 to fp128
+  %res = fmul fp128 %f1x, %f2x
+  store fp128 %res, fp128 *%dst
+  ret void
+}
+
+; Check the high end of the aligned MXDB range.
+define void @f3(double %f1, double *%base, fp128 *%dst) {
+; CHECK: f3:
+; CHECK: mxdb %f0, 4088(%r2)
+; CHECK: std %f0, 0(%r3)
+; CHECK: std %f2, 8(%r3)
+; CHECK: br %r14
+  %ptr = getelementptr double *%base, i64 511
+  %f2 = load double *%ptr
+  %f1x = fpext double %f1 to fp128
+  %f2x = fpext double %f2 to fp128
+  %res = fmul fp128 %f1x, %f2x
+  store fp128 %res, fp128 *%dst
+  ret void
+}
+
+; Check the next doubleword up, which needs separate address logic.
+; Other sequences besides this one would be OK.
+define void @f4(double %f1, double *%base, fp128 *%dst) {
+; CHECK: f4:
+; CHECK: aghi %r2, 4096
+; CHECK: mxdb %f0, 0(%r2)
+; CHECK: std %f0, 0(%r3)
+; CHECK: std %f2, 8(%r3)
+; CHECK: br %r14
+  %ptr = getelementptr double *%base, i64 512
+  %f2 = load double *%ptr
+  %f1x = fpext double %f1 to fp128
+  %f2x = fpext double %f2 to fp128
+  %res = fmul fp128 %f1x, %f2x
+  store fp128 %res, fp128 *%dst
+  ret void
+}
+
+; Check negative displacements, which also need separate address logic.
+define void @f5(double %f1, double *%base, fp128 *%dst) {
+; CHECK: f5:
+; CHECK: aghi %r2, -8
+; CHECK: mxdb %f0, 0(%r2)
+; CHECK: std %f0, 0(%r3)
+; CHECK: std %f2, 8(%r3)
+; CHECK: br %r14
+  %ptr = getelementptr double *%base, i64 -1
+  %f2 = load double *%ptr
+  %f1x = fpext double %f1 to fp128
+  %f2x = fpext double %f2 to fp128
+  %res = fmul fp128 %f1x, %f2x
+  store fp128 %res, fp128 *%dst
+  ret void
+}
+
+; Check that MXDB allows indices.
+define void @f6(double %f1, double *%base, i64 %index, fp128 *%dst) {
+; CHECK: f6:
+; CHECK: sllg %r1, %r3, 3
+; CHECK: mxdb %f0, 800(%r1,%r2)
+; CHECK: std %f0, 0(%r4)
+; CHECK: std %f2, 8(%r4)
+; CHECK: br %r14
+  %ptr1 = getelementptr double *%base, i64 %index
+  %ptr2 = getelementptr double *%ptr1, i64 100
+  %f2 = load double *%ptr2
+  %f1x = fpext double %f1 to fp128
+  %f2x = fpext double %f2 to fp128
+  %res = fmul fp128 %f1x, %f2x
+  store fp128 %res, fp128 *%dst
+  ret void
+}