[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, 131 insertions, 0 deletions

diff --git a/llvm/test/CodeGen/SystemZ/int-mul-01.ll b/llvm/test/CodeGen/SystemZ/int-mul-01.ll
new file mode 100644
index 00000000000..e1246e2156e
--- /dev/null
+++ b/llvm/test/CodeGen/SystemZ/int-mul-01.ll
@@ -0,0 +1,131 @@
+; Test 32-bit multiplication in which the second operand is a sign-extended
+; i16 memory value.
+;
+; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s
+
+; Check the low end of the MH range.
+define i32 @f1(i32 %lhs, i16 *%src) {
+; CHECK: f1:
+; CHECK: mh %r2, 0(%r3)
+; CHECK: br %r14
+  %half = load i16 *%src
+  %rhs = sext i16 %half to i32
+  %res = mul i32 %lhs, %rhs
+  ret i32 %res
+}
+
+; Check the high end of the aligned MH range.
+define i32 @f2(i32 %lhs, i16 *%src) {
+; CHECK: f2:
+; CHECK: mh %r2, 4094(%r3)
+; CHECK: br %r14
+  %ptr = getelementptr i16 *%src, i64 2047
+  %half = load i16 *%ptr
+  %rhs = sext i16 %half to i32
+  %res = mul i32 %lhs, %rhs
+  ret i32 %res
+}
+
+; Check the next halfword up, which should use MHY instead of MH.
+define i32 @f3(i32 %lhs, i16 *%src) {
+; CHECK: f3:
+; CHECK: mhy %r2, 4096(%r3)
+; CHECK: br %r14
+  %ptr = getelementptr i16 *%src, i64 2048
+  %half = load i16 *%ptr
+  %rhs = sext i16 %half to i32
+  %res = mul i32 %lhs, %rhs
+  ret i32 %res
+}
+
+; Check the high end of the aligned MHY range.
+define i32 @f4(i32 %lhs, i16 *%src) {
+; CHECK: f4:
+; CHECK: mhy %r2, 524286(%r3)
+; CHECK: br %r14
+  %ptr = getelementptr i16 *%src, i64 262143
+  %half = load i16 *%ptr
+  %rhs = sext i16 %half to i32
+  %res = mul i32 %lhs, %rhs
+  ret i32 %res
+}
+
+; Check the next halfword up, which needs separate address logic.
+; Other sequences besides this one would be OK.
+define i32 @f5(i32 %lhs, i16 *%src) {
+; CHECK: f5:
+; CHECK: agfi %r3, 524288
+; CHECK: mh %r2, 0(%r3)
+; CHECK: br %r14
+  %ptr = getelementptr i16 *%src, i64 262144
+  %half = load i16 *%ptr
+  %rhs = sext i16 %half to i32
+  %res = mul i32 %lhs, %rhs
+  ret i32 %res
+}
+
+; Check the high end of the negative aligned MHY range.
+define i32 @f6(i32 %lhs, i16 *%src) {
+; CHECK: f6:
+; CHECK: mhy %r2, -2(%r3)
+; CHECK: br %r14
+  %ptr = getelementptr i16 *%src, i64 -1
+  %half = load i16 *%ptr
+  %rhs = sext i16 %half to i32
+  %res = mul i32 %lhs, %rhs
+  ret i32 %res
+}
+
+; Check the low end of the MHY range.
+define i32 @f7(i32 %lhs, i16 *%src) {
+; CHECK: f7:
+; CHECK: mhy %r2, -524288(%r3)
+; CHECK: br %r14
+  %ptr = getelementptr i16 *%src, i64 -262144
+  %half = load i16 *%ptr
+  %rhs = sext i16 %half to i32
+  %res = mul i32 %lhs, %rhs
+  ret i32 %res
+}
+
+; Check the next halfword down, which needs separate address logic.
+; Other sequences besides this one would be OK.
+define i32 @f8(i32 %lhs, i16 *%src) {
+; CHECK: f8:
+; CHECK: agfi %r3, -524290
+; CHECK: mh %r2, 0(%r3)
+; CHECK: br %r14
+  %ptr = getelementptr i16 *%src, i64 -262145
+  %half = load i16 *%ptr
+  %rhs = sext i16 %half to i32
+  %res = mul i32 %lhs, %rhs
+  ret i32 %res
+}
+
+; Check that MH allows an index.
+define i32 @f9(i32 %lhs, i64 %src, i64 %index) {
+; CHECK: f9:
+; CHECK: mh %r2, 4094({{%r4,%r3|%r3,%r4}})
+; CHECK: br %r14
+  %add1 = add i64 %src, %index
+  %add2 = add i64 %add1, 4094
+  %ptr = inttoptr i64 %add2 to i16 *
+  %half = load i16 *%ptr
+  %rhs = sext i16 %half to i32
+  %res = mul i32 %lhs, %rhs
+  ret i32 %res
+}
+
+; Check that MHY allows an index.
+define i32 @f10(i32 %lhs, i64 %src, i64 %index) {
+; CHECK: f10:
+; CHECK: mhy %r2, 4096({{%r4,%r3|%r3,%r4}})
+; CHECK: br %r14
+  %add1 = add i64 %src, %index
+  %add2 = add i64 %add1, 4096
+  %ptr = inttoptr i64 %add2 to i16 *
+  %half = load i16 *%ptr
+  %rhs = sext i16 %half to i32
+  %res = mul i32 %lhs, %rhs
+  ret i32 %res
+}