[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.

llvm-svn: 181204

1 files changed, 133 insertions, 0 deletions

diff --git a/llvm/test/CodeGen/SystemZ/atomicrmw-and-01.ll b/llvm/test/CodeGen/SystemZ/atomicrmw-and-01.ll
new file mode 100644
index 00000000000..ebbce8e7872
--- /dev/null
+++ b/llvm/test/CodeGen/SystemZ/atomicrmw-and-01.ll
@@ -0,0 +1,133 @@
+; Test 8-bit atomic ANDs.
+;
+; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s -check-prefix=CHECK
+; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s -check-prefix=CHECK-SHIFT1
+; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s -check-prefix=CHECK-SHIFT2
+
+; Check AND of a variable.
+; - CHECK is for the main loop.
+; - CHECK-SHIFT1 makes sure that the negated shift count used by the second
+;   RLL is set up correctly.  The negation is independent of the NILL and L
+;   tested in CHECK.
+; - CHECK-SHIFT2 makes sure that %b is shifted into the high part of the word
+;   before being used, and that the low bits are set to 1.  This sequence is
+;   independent of the other loop prologue instructions.
+define i8 @f1(i8 *%src, i8 %b) {
+; CHECK: f1:
+; CHECK: sllg [[SHIFT:%r[1-9]+]], %r2, 3
+; CHECK: nill %r2, 65532
+; CHECK: l [[OLD:%r[0-9]+]], 0(%r2)
+; CHECK: [[LABEL:\.[^:]*]]:
+; CHECK: rll [[ROT:%r[0-9]+]], [[OLD]], 0([[SHIFT]])
+; CHECK: nr [[ROT]], %r3
+; CHECK: rll [[NEW:%r[0-9]+]], [[ROT]], 0({{%r[1-9]+}})
+; CHECK: cs [[OLD]], [[NEW]], 0(%r2)
+; CHECK: j{{g?}}lh [[LABEL]]
+; CHECK: rll %r2, [[OLD]], 8([[SHIFT]])
+; CHECK: br %r14
+;
+; CHECK-SHIFT1: f1:
+; CHECK-SHIFT1: sllg [[SHIFT:%r[1-9]+]], %r2, 3
+; CHECK-SHIFT1: lcr [[NEGSHIFT:%r[1-9]+]], [[SHIFT]]
+; CHECK-SHIFT1: rll
+; CHECK-SHIFT1: rll {{%r[0-9]+}}, {{%r[0-9]+}}, 0([[NEGSHIFT]])
+; CHECK-SHIFT1: rll
+; CHECK-SHIFT1: br %r14
+;
+; CHECK-SHIFT2: f1:
+; CHECK-SHIFT2: sll %r3, 24
+; CHECK-SHIFT2: oilf %r3, 16777215
+; CHECK-SHIFT2: rll
+; CHECK-SHIFT2: nr {{%r[0-9]+}}, %r3
+; CHECK-SHIFT2: rll
+; CHECK-SHIFT2: rll
+; CHECK-SHIFT2: br %r14
+  %res = atomicrmw and i8 *%src, i8 %b seq_cst
+  ret i8 %res
+}
+
+; Check the minimum signed value.  We AND the rotated word with 0x80ffffff.
+define i8 @f2(i8 *%src) {
+; CHECK: f2:
+; CHECK: sllg [[SHIFT:%r[1-9]+]], %r2, 3
+; CHECK: nill %r2, 65532
+; CHECK: l [[OLD:%r[0-9]+]], 0(%r2)
+; CHECK: [[LABEL:\.[^:]*]]:
+; CHECK: rll [[ROT:%r[0-9]+]], [[OLD]], 0([[SHIFT]])
+; CHECK: nilh [[ROT]], 33023
+; CHECK: rll [[NEW:%r[0-9]+]], [[ROT]], 0([[NEGSHIFT:%r[1-9]+]])
+; CHECK: cs [[OLD]], [[NEW]], 0(%r2)
+; CHECK: j{{g?}}lh [[LABEL]]
+; CHECK: rll %r2, [[OLD]], 8([[SHIFT]])
+; CHECK: br %r14
+;
+; CHECK-SHIFT1: f2:
+; CHECK-SHIFT1: sllg [[SHIFT:%r[1-9]+]], %r2, 3
+; CHECK-SHIFT1: lcr [[NEGSHIFT:%r[1-9]+]], [[SHIFT]]
+; CHECK-SHIFT1: rll
+; CHECK-SHIFT1: rll {{%r[0-9]+}}, {{%r[0-9]+}}, 0([[NEGSHIFT]])
+; CHECK-SHIFT1: rll
+; CHECK-SHIFT1: br %r14
+;
+; CHECK-SHIFT2: f2:
+; CHECK-SHIFT2: br %r14
+  %res = atomicrmw and i8 *%src, i8 -128 seq_cst
+  ret i8 %res
+}
+
+; Check ANDs of -2 (-1 isn't useful).  We AND the rotated word with 0xfeffffff.
+define i8 @f3(i8 *%src) {
+; CHECK: f3:
+; CHECK: nilh [[ROT]], 65279
+; CHECK: br %r14
+;
+; CHECK-SHIFT1: f3:
+; CHECK-SHIFT1: br %r14
+; CHECK-SHIFT2: f3:
+; CHECK-SHIFT2: br %r14
+  %res = atomicrmw and i8 *%src, i8 -2 seq_cst
+  ret i8 %res
+}
+
+; Check ANDs of 1.  We AND the rotated word with 0x01ffffff.
+define i8 @f4(i8 *%src) {
+; CHECK: f4:
+; CHECK: nilh [[ROT]], 511
+; CHECK: br %r14
+;
+; CHECK-SHIFT1: f4:
+; CHECK-SHIFT1: br %r14
+; CHECK-SHIFT2: f4:
+; CHECK-SHIFT2: br %r14
+  %res = atomicrmw and i8 *%src, i8 1 seq_cst
+  ret i8 %res
+}
+
+; Check the maximum signed value.  We AND the rotated word with 0x7fffffff.
+define i8 @f5(i8 *%src) {
+; CHECK: f5:
+; CHECK: nilh [[ROT]], 32767
+; CHECK: br %r14
+;
+; CHECK-SHIFT1: f5:
+; CHECK-SHIFT1: br %r14
+; CHECK-SHIFT2: f5:
+; CHECK-SHIFT2: br %r14
+  %res = atomicrmw and i8 *%src, i8 127 seq_cst
+  ret i8 %res
+}
+
+; Check ANDs of a large unsigned value.  We AND the rotated word with
+; 0xfdffffff.
+define i8 @f6(i8 *%src) {
+; CHECK: f6:
+; CHECK: nilh [[ROT]], 65023
+; CHECK: br %r14
+;
+; CHECK-SHIFT1: f6:
+; CHECK-SHIFT1: br %r14
+; CHECK-SHIFT2: f6:
+; CHECK-SHIFT2: br %r14
+  %res = atomicrmw and i8 *%src, i8 253 seq_cst
+  ret i8 %res
+}