[SystemZ] Add support for TMHH, TMHL, TMLH and TMLL
For now just handles simple comparisons of an ANDed value with zero.
The CC value provides enough information to do any comparison for a
2-bit mask, and some nonzero comparisons with more populated masks,
but that's all future work.
llvm-svn: 189469
diff --git a/llvm/test/CodeGen/SystemZ/int-cmp-46.ll b/llvm/test/CodeGen/SystemZ/int-cmp-46.ll
new file mode 100644
index 0000000..b46ca5e
--- /dev/null
+++ b/llvm/test/CodeGen/SystemZ/int-cmp-46.ll
@@ -0,0 +1,99 @@
+; Test the use of TEST UNDER MASK for 32-bit operations.
+;
+; RUN: llc < %s -mtriple=s390x-linux-gnu -mcpu=z196 | FileCheck %s
+
+@g = global i32 0
+
+; Check the lowest useful TMLL value.
+define void @f1(i32 %a) {
+; CHECK-LABEL: f1:
+; CHECK: tmll %r2, 1
+; CHECK: je {{\.L.*}}
+; CHECK: br %r14
+entry:
+ %and = and i32 %a, 1
+ %cmp = icmp eq i32 %and, 0
+ br i1 %cmp, label %exit, label %store
+
+store:
+ store i32 1, i32 *@g
+ br label %exit
+
+exit:
+ ret void
+}
+
+; Check the high end of the TMLL range.
+define void @f2(i32 %a) {
+; CHECK-LABEL: f2:
+; CHECK: tmll %r2, 65535
+; CHECK: jne {{\.L.*}}
+; CHECK: br %r14
+entry:
+ %and = and i32 %a, 65535
+ %cmp = icmp ne i32 %and, 0
+ br i1 %cmp, label %exit, label %store
+
+store:
+ store i32 1, i32 *@g
+ br label %exit
+
+exit:
+ ret void
+}
+
+; Check the lowest useful TMLH value, which is the next value up.
+define void @f3(i32 %a) {
+; CHECK-LABEL: f3:
+; CHECK: tmlh %r2, 1
+; CHECK: jne {{\.L.*}}
+; CHECK: br %r14
+entry:
+ %and = and i32 %a, 65536
+ %cmp = icmp ne i32 %and, 0
+ br i1 %cmp, label %exit, label %store
+
+store:
+ store i32 1, i32 *@g
+ br label %exit
+
+exit:
+ ret void
+}
+
+; Check the next value up again, which cannot use TM.
+define void @f4(i32 %a) {
+; CHECK-LABEL: f4:
+; CHECK-NOT: {{tm[lh].}}
+; CHECK: br %r14
+entry:
+ %and = and i32 %a, 4294901759
+ %cmp = icmp eq i32 %and, 0
+ br i1 %cmp, label %exit, label %store
+
+store:
+ store i32 1, i32 *@g
+ br label %exit
+
+exit:
+ ret void
+}
+
+; Check the high end of the TMLH range.
+define void @f5(i32 %a) {
+; CHECK-LABEL: f5:
+; CHECK: tmlh %r2, 65535
+; CHECK: je {{\.L.*}}
+; CHECK: br %r14
+entry:
+ %and = and i32 %a, 4294901760
+ %cmp = icmp eq i32 %and, 0
+ br i1 %cmp, label %exit, label %store
+
+store:
+ store i32 1, i32 *@g
+ br label %exit
+
+exit:
+ ret void
+}