[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.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@181204 91177308-0d34-0410-b5e6-96231b3b80d8

test/CodeGen/SystemZ/asm-08.ll

@@ -0,0 +1,39 @@
+; Test the GPR constraint "d", which is equivalent to "r".
+;
+; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s
+
+define i64 @f1() {
+; CHECK: f1:
+; CHECK: lhi %r0, 1
+; CHECK: blah %r2 %r0
+; CHECK: br %r14
+  %val = call i64 asm "blah $0 $1", "=d,d" (i8 1)
+  ret i64 %val
+}
+
+define i64 @f2() {
+; CHECK: f2:
+; CHECK: lhi %r0, 2
+; CHECK: blah %r2 %r0
+; CHECK: br %r14
+  %val = call i64 asm "blah $0 $1", "=d,d" (i16 2)
+  ret i64 %val
+}
+
+define i64 @f3() {
+; CHECK: f3:
+; CHECK: lhi %r0, 3
+; CHECK: blah %r2 %r0
+; CHECK: br %r14
+  %val = call i64 asm "blah $0 $1", "=d,d" (i32 3)
+  ret i64 %val
+}
+
+define i64 @f4() {
+; CHECK: f4:
+; CHECK: lghi %r0, 4
+; CHECK: blah %r2 %r0
+; CHECK: br %r14
+  %val = call i64 asm "blah $0 $1", "=d,d" (i64 4)
+  ret i64 %val
+}