1 files changed, 101 insertions, 0 deletions
diff --git a/test/CodeGen/SystemZ/shift-04.ll b/test/CodeGen/SystemZ/shift-04.ll
index 04b39d0..de2d74f 100644
--- a/test/CodeGen/SystemZ/shift-04.ll
+++ b/test/CodeGen/SystemZ/shift-04.ll
@@ -187,3 +187,104 @@ define i32 @f14(i32 %a, i32 *%ptr) {
   %or = or i32 %parta, %partb
   ret i32 %or
 }
+
+; Check another form of f5, which is the one produced by running f5 through
+; instcombine.
+define i32 @f15(i32 %a, i32 %amt) {
+; CHECK-LABEL: f15:
+; CHECK: rll %r2, %r2, 10(%r3)
+; CHECK: br %r14
+  %add = add i32 %amt, 10
+  %sub = sub i32 22, %amt
+  %parta = shl i32 %a, %add
+  %partb = lshr i32 %a, %sub
+  %or = or i32 %parta, %partb
+  ret i32 %or
+}
+
+; Likewise for f7.
+define i32 @f16(i32 %a, i64 %amt) {
+; CHECK-LABEL: f16:
+; CHECK: rll %r2, %r2, 10(%r3)
+; CHECK: br %r14
+  %add = add i64 %amt, 10
+  %sub = sub i64 22, %amt
+  %addtrunc = trunc i64 %add to i32
+  %subtrunc = trunc i64 %sub to i32
+  %parta = shl i32 %a, %addtrunc
+  %partb = lshr i32 %a, %subtrunc
+  %or = or i32 %parta, %partb
+  ret i32 %or
+}
+
+; Check cases where (-x & 31) is used instead of 32 - x.
+define i32 @f17(i32 %x, i32 %y) {
+; CHECK-LABEL: f17:
+; CHECK: rll %r2, %r2, 0(%r3)
+; CHECK: br %r14
+entry:
+  %shl = shl i32 %x, %y
+  %sub = sub i32 0, %y
+  %and = and i32 %sub, 31
+  %shr = lshr i32 %x, %and
+  %or = or i32 %shr, %shl
+  ret i32 %or
+}
+
+; ...and again with ((32 - x) & 31).
+define i32 @f18(i32 %x, i32 %y) {
+; CHECK-LABEL: f18:
+; CHECK: rll %r2, %r2, 0(%r3)
+; CHECK: br %r14
+entry:
+  %shl = shl i32 %x, %y
+  %sub = sub i32 32, %y
+  %and = and i32 %sub, 31
+  %shr = lshr i32 %x, %and
+  %or = or i32 %shr, %shl
+  ret i32 %or
+}
+
+; This is not a rotation.
+define i32 @f19(i32 %x, i32 %y) {
+; CHECK-LABEL: f19:
+; CHECK-NOT: rll
+; CHECK: br %r14
+entry:
+  %shl = shl i32 %x, %y
+  %sub = sub i32 16, %y
+  %and = and i32 %sub, 31
+  %shr = lshr i32 %x, %and
+  %or = or i32 %shr, %shl
+  ret i32 %or
+}
+
+; Repeat f17 with an addition on the shift count.
+define i32 @f20(i32 %x, i32 %y) {
+; CHECK-LABEL: f20:
+; CHECK: rll %r2, %r2, 199(%r3)
+; CHECK: br %r14
+entry:
+  %add = add i32 %y, 199
+  %shl = shl i32 %x, %add
+  %sub = sub i32 0, %add
+  %and = and i32 %sub, 31
+  %shr = lshr i32 %x, %and
+  %or = or i32 %shr, %shl
+  ret i32 %or
+}
+
+; ...and again with the InstCombine version.
+define i32 @f21(i32 %x, i32 %y) {
+; CHECK-LABEL: f21:
+; CHECK: rll %r2, %r2, 199(%r3)
+; CHECK: br %r14
+entry:
+  %add = add i32 %y, 199
+  %shl = shl i32 %x, %add
+  %sub = sub i32 -199, %y
+  %and = and i32 %sub, 31
+  %shr = lshr i32 %x, %and
+  %or = or i32 %shr, %shl
+  ret i32 %or
+}