1 files changed, 67 insertions, 0 deletions
diff --git a/test/CodeGen/SystemZ/shift-10.ll b/test/CodeGen/SystemZ/shift-10.ll
new file mode 100644
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--- /dev/null
+++ b/test/CodeGen/SystemZ/shift-10.ll
@@ -0,0 +1,67 @@
+; Test compound shifts.
+;
+; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s
+
+; Test a shift right followed by a sign extension.  This can use two shifts.
+define i64 @f1(i32 %a) {
+; CHECK-LABEL: f1:
+; CHECK: sllg [[REG:%r[0-5]]], %r2, 62
+; CHECK: srag %r2, [[REG]], 63
+; CHECK: br %r14
+  %shr = lshr i32 %a, 1
+  %trunc = trunc i32 %shr to i1
+  %ext = sext i1 %trunc to i64
+  ret i64 %ext
+}
+
+; ...and again with the highest shift count.
+define i64 @f2(i32 %a) {
+; CHECK-LABEL: f2:
+; CHECK: sllg [[REG:%r[0-5]]], %r2, 32
+; CHECK: srag %r2, [[REG]], 63
+; CHECK: br %r14
+  %shr = lshr i32 %a, 31
+  %trunc = trunc i32 %shr to i1
+  %ext = sext i1 %trunc to i64
+  ret i64 %ext
+}
+
+; Test a left shift that of an extended right shift in a case where folding
+; is possible.
+define i64 @f3(i32 %a) {
+; CHECK-LABEL: f3:
+; CHECK: risbg %r2, %r2, 27, 181, 9
+; CHECK: br %r14
+  %shr = lshr i32 %a, 1
+  %ext = zext i32 %shr to i64
+  %shl = shl i64 %ext, 10
+  %and = and i64 %shl, 137438952960
+  ret i64 %and
+}
+
+; ...and again with a larger right shift.
+define i64 @f4(i32 %a) {
+; CHECK-LABEL: f4:
+; CHECK: risbg %r2, %r2, 30, 158, 3
+; CHECK: br %r14
+  %shr = lshr i32 %a, 30
+  %ext = sext i32 %shr to i64
+  %shl = shl i64 %ext, 33
+  %and = and i64 %shl, 8589934592
+  ret i64 %and
+}
+
+; Repeat the previous test in a case where all bits outside the
+; bottom 3 matter.  FIXME: can still use RISBG here.
+define i64 @f5(i32 %a) {
+; CHECK-LABEL: f5:
+; CHECK: srl %r2, 30
+; CHECK: sllg %r2, %r2, 33
+; CHECK: lhi %r2, 7
+; CHECK: br %r14
+  %shr = lshr i32 %a, 30
+  %ext = sext i32 %shr to i64
+  %shl = shl i64 %ext, 33
+  %or = or i64 %shl, 7
+  ret i64 %or
+}