[SystemZ] Use RXSBG

Extend the previous R.SBG patches to handle XORs.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@186570 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 112 insertions, 0 deletions

diff --git a/test/CodeGen/SystemZ/rxsbg-01.ll b/test/CodeGen/SystemZ/rxsbg-01.ll
new file mode 100644
index 0000000000..5491bff2ec
--- /dev/null
+++ b/test/CodeGen/SystemZ/rxsbg-01.ll
@@ -0,0 +1,112 @@
+; Test sequences that can use RXSBG.
+;
+; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s
+
+; Test the simple case.
+define i32 @f1(i32 %a, i32 %b) {
+; CHECK-LABEL: f1:
+; CHECK: rxsbg %r2, %r3, 59, 59, 0
+; CHECK: br %r14
+  %andb = and i32 %b, 16
+  %xor = xor i32 %a, %andb
+  ret i32 %xor
+}
+
+; ...and again with i64.
+define i64 @f2(i64 %a, i64 %b) {
+; CHECK-LABEL: f2:
+; CHECK: rxsbg %r2, %r3, 59, 59, 0
+; CHECK: br %r14
+  %andb = and i64 %b, 16
+  %xor = xor i64 %a, %andb
+  ret i64 %xor
+}
+
+; Test a case where wraparound is needed.
+define i32 @f3(i32 %a, i32 %b) {
+; CHECK-LABEL: f3:
+; CHECK: rxsbg %r2, %r3, 63, 60, 0
+; CHECK: br %r14
+  %andb = and i32 %b, -7
+  %xor = xor i32 %a, %andb
+  ret i32 %xor
+}
+
+; ...and again with i64.
+define i64 @f4(i64 %a, i64 %b) {
+; CHECK-LABEL: f4:
+; CHECK: rxsbg %r2, %r3, 63, 60, 0
+; CHECK: br %r14
+  %andb = and i64 %b, -7
+  %xor = xor i64 %a, %andb
+  ret i64 %xor
+}
+
+; Test a case with just a shift.
+define i32 @f6(i32 %a, i32 %b) {
+; CHECK-LABEL: f6:
+; CHECK: rxsbg %r2, %r3, 32, 51, 12
+; CHECK: br %r14
+  %shlb = shl i32 %b, 12
+  %xor = xor i32 %a, %shlb
+  ret i32 %xor
+}
+
+; ...and again with i64.
+define i64 @f7(i64 %a, i64 %b) {
+; CHECK-LABEL: f7:
+; CHECK: rxsbg %r2, %r3, 0, 51, 12
+; CHECK: br %r14
+  %shlb = shl i64 %b, 12
+  %xor = xor i64 %a, %shlb
+  ret i64 %xor
+}
+
+; Test a case with just a rotate (using XOR for the rotate combination too,
+; to test that this kind of rotate does get recognised by the target-
+; independent code).  This can't use RXSBG.
+define i32 @f8(i32 %a, i32 %b) {
+; CHECK-LABEL: f8:
+; CHECK: rll {{%r[0-5]}}
+; CHECK: xr {{%r[0-5]}}
+; CHECK: br %r14
+  %shlb = shl i32 %b, 30
+  %shrb = lshr i32 %b, 2
+  %rotlb = xor i32 %shlb, %shrb
+  %xor = xor i32 %a, %rotlb
+  ret i32 %xor
+}
+
+; ...and again with i64, which can use RXSBG for the rotate.
+define i64 @f9(i64 %a, i64 %b) {
+; CHECK-LABEL: f9:
+; CHECK: rxsbg %r2, %r3, 0, 63, 47
+; CHECK: br %r14
+  %shlb = shl i64 %b, 47
+  %shrb = lshr i64 %b, 17
+  %rotlb = xor i64 %shlb, %shrb
+  %xor = xor i64 %a, %rotlb
+  ret i64 %xor
+}
+
+; Test a case with a shift and AND.
+define i32 @f10(i32 %a, i32 %b) {
+; CHECK-LABEL: f10:
+; CHECK: rxsbg %r2, %r3, 56, 59, 4
+; CHECK: br %r14
+  %shlb = shl i32 %b, 4
+  %andb = and i32 %shlb, 240
+  %xor = xor i32 %a, %andb
+  ret i32 %xor
+}
+
+; ...and again with i64.
+define i64 @f11(i64 %a, i64 %b) {
+; CHECK-LABEL: f11:
+; CHECK: rxsbg %r2, %r3, 56, 59, 4
+; CHECK: br %r14
+  %shlb = shl i64 %b, 4
+  %andb = and i64 %shlb, 240
+  %xor = xor i64 %a, %andb
+  ret i64 %xor
+}