--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/CodeGen/SystemZ/atomicrmw-add-02.ll	Thu Dec 12 13:56:28 2013 +0900
@@ -0,0 +1,132 @@
+; Test 16-bit atomic additions.
+;
+; 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 addition 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.  This shift is independent of the other loop prologue
+;   instructions.
+define i16 @f1(i16 *%src, i16 %b) {
+; CHECK-LABEL: 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: ar [[ROT]], %r3
+; CHECK: rll [[NEW:%r[0-9]+]], [[ROT]], 0({{%r[1-9]+}})
+; CHECK: cs [[OLD]], [[NEW]], 0(%r2)
+; CHECK: jl [[LABEL]]
+; CHECK: rll %r2, [[OLD]], 16([[SHIFT]])
+; CHECK: br %r14
+;
+; CHECK-SHIFT1-LABEL: 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-LABEL: f1:
+; CHECK-SHIFT2: sll %r3, 16
+; CHECK-SHIFT2: rll
+; CHECK-SHIFT2: ar {{%r[0-9]+}}, %r3
+; CHECK-SHIFT2: rll
+; CHECK-SHIFT2: rll
+; CHECK-SHIFT2: br %r14
+  %res = atomicrmw add i16 *%src, i16 %b seq_cst
+  ret i16 %res
+}
+
+; Check the minimum signed value.  We add 0x80000000 to the rotated word.
+define i16 @f2(i16 *%src) {
+; CHECK-LABEL: 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: afi [[ROT]], -2147483648
+; CHECK: rll [[NEW:%r[0-9]+]], [[ROT]], 0([[NEGSHIFT:%r[1-9]+]])
+; CHECK: cs [[OLD]], [[NEW]], 0(%r2)
+; CHECK: jl [[LABEL]]
+; CHECK: rll %r2, [[OLD]], 16([[SHIFT]])
+; CHECK: br %r14
+;
+; CHECK-SHIFT1-LABEL: 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-LABEL: f2:
+; CHECK-SHIFT2: br %r14
+  %res = atomicrmw add i16 *%src, i16 -32768 seq_cst
+  ret i16 %res
+}
+
+; Check addition of -1.  We add 0xffff0000 to the rotated word.
+define i16 @f3(i16 *%src) {
+; CHECK-LABEL: f3:
+; CHECK: afi [[ROT]], -65536
+; CHECK: br %r14
+;
+; CHECK-SHIFT1-LABEL: f3:
+; CHECK-SHIFT1: br %r14
+; CHECK-SHIFT2-LABEL: f3:
+; CHECK-SHIFT2: br %r14
+  %res = atomicrmw add i16 *%src, i16 -1 seq_cst
+  ret i16 %res
+}
+
+; Check addition of 1.  We add 0x00010000 to the rotated word.
+define i16 @f4(i16 *%src) {
+; CHECK-LABEL: f4:
+; CHECK: afi [[ROT]], 65536
+; CHECK: br %r14
+;
+; CHECK-SHIFT1-LABEL: f4:
+; CHECK-SHIFT1: br %r14
+; CHECK-SHIFT2-LABEL: f4:
+; CHECK-SHIFT2: br %r14
+  %res = atomicrmw add i16 *%src, i16 1 seq_cst
+  ret i16 %res
+}
+
+; Check the maximum signed value.  We add 0x7fff0000 to the rotated word.
+define i16 @f5(i16 *%src) {
+; CHECK-LABEL: f5:
+; CHECK: afi [[ROT]], 2147418112
+; CHECK: br %r14
+;
+; CHECK-SHIFT1-LABEL: f5:
+; CHECK-SHIFT1: br %r14
+; CHECK-SHIFT2-LABEL: f5:
+; CHECK-SHIFT2: br %r14
+  %res = atomicrmw add i16 *%src, i16 32767 seq_cst
+  ret i16 %res
+}
+
+; Check addition of a large unsigned value.  We add 0xfffe0000 to the
+; rotated word, expressed as a negative AFI operand.
+define i16 @f6(i16 *%src) {
+; CHECK-LABEL: f6:
+; CHECK: afi [[ROT]], -131072
+; CHECK: br %r14
+;
+; CHECK-SHIFT1-LABEL: f6:
+; CHECK-SHIFT1: br %r14
+; CHECK-SHIFT2-LABEL: f6:
+; CHECK-SHIFT2: br %r14
+  %res = atomicrmw add i16 *%src, i16 65534 seq_cst
+  ret i16 %res
+}