[SystemZ] Use SLLK, SRLK and SRAK for codegen

This patch uses the instructions added in r186680 for codegen.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@186681 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 63 insertions, 0 deletions

diff --git a/test/CodeGen/SystemZ/shift-09.ll b/test/CodeGen/SystemZ/shift-09.ll
new file mode 100644
index 0000000000..c87cf0d9a1
--- /dev/null
+++ b/test/CodeGen/SystemZ/shift-09.ll
@@ -0,0 +1,63 @@
+; Test three-operand shifts.
+;
+; RUN: llc < %s -mtriple=s390x-linux-gnu -mcpu=z196 | FileCheck %s
+
+; Check that we use SLLK over SLL where useful.
+define i32 @f1(i32 %a, i32 %b, i32 %amt) {
+; CHECK-LABEL: f1:
+; CHECK: sllk %r2, %r3, 15(%r4)
+; CHECK: br %r14
+  %add = add i32 %amt, 15
+  %shift = shl i32 %b, %add
+  ret i32 %shift
+}
+
+; Check that we use SLL over SLLK where possible.
+define i32 @f2(i32 %a, i32 %amt) {
+; CHECK-LABEL: f2:
+; CHECK: sll %r2, 15(%r3)
+; CHECK: br %r14
+  %add = add i32 %amt, 15
+  %shift = shl i32 %a, %add
+  ret i32 %shift
+}
+
+; Check that we use SRLK over SRL where useful.
+define i32 @f3(i32 %a, i32 %b, i32 %amt) {
+; CHECK-LABEL: f3:
+; CHECK: srlk %r2, %r3, 15(%r4)
+; CHECK: br %r14
+  %add = add i32 %amt, 15
+  %shift = lshr i32 %b, %add
+  ret i32 %shift
+}
+
+; Check that we use SRL over SRLK where possible.
+define i32 @f4(i32 %a, i32 %amt) {
+; CHECK-LABEL: f4:
+; CHECK: srl %r2, 15(%r3)
+; CHECK: br %r14
+  %add = add i32 %amt, 15
+  %shift = lshr i32 %a, %add
+  ret i32 %shift
+}
+
+; Check that we use SRAK over SRA where useful.
+define i32 @f5(i32 %a, i32 %b, i32 %amt) {
+; CHECK-LABEL: f5:
+; CHECK: srak %r2, %r3, 15(%r4)
+; CHECK: br %r14
+  %add = add i32 %amt, 15
+  %shift = ashr i32 %b, %add
+  ret i32 %shift
+}
+
+; Check that we use SRA over SRAK where possible.
+define i32 @f6(i32 %a, i32 %amt) {
+; CHECK-LABEL: f6:
+; CHECK: sra %r2, 15(%r3)
+; CHECK: br %r14
+  %add = add i32 %amt, 15
+  %shift = ashr i32 %a, %add
+  ret i32 %shift
+}