[SystemZ] Add basic prefetch support

Just the instructions and intrinsics for now.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@189100 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 87 insertions, 0 deletions

diff --git a/test/CodeGen/SystemZ/prefetch-01.ll b/test/CodeGen/SystemZ/prefetch-01.ll
new file mode 100644
index 0000000..bb7fea9
--- /dev/null
+++ b/test/CodeGen/SystemZ/prefetch-01.ll
@@ -0,0 +1,87 @@
+; Test data prefetching.
+;
+; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s
+
+declare void @llvm.prefetch(i8*, i32, i32, i32)
+
+@g = global [4096 x i8] zeroinitializer
+
+; Check that instruction read prefetches are ignored.
+define void @f1(i8 *%ptr) {
+; CHECK-LABEL: f1:
+; CHECK-NOT: %r2
+; CHECK: br %r14
+  call void @llvm.prefetch(i8 *%ptr, i32 0, i32 0, i32 0)
+  ret void
+}
+
+; Check that instruction write prefetches are ignored.
+define void @f2(i8 *%ptr) {
+; CHECK-LABEL: f2:
+; CHECK-NOT: %r2
+; CHECK: br %r14
+  call void @llvm.prefetch(i8 *%ptr, i32 1, i32 0, i32 0)
+  ret void
+}
+
+; Check data read prefetches.
+define void @f3(i8 *%ptr) {
+; CHECK-LABEL: f3:
+; CHECK: pfd 1, 0(%r2)
+; CHECK: br %r14
+  call void @llvm.prefetch(i8 *%ptr, i32 0, i32 0, i32 1)
+  ret void
+}
+
+; Check data write prefetches.
+define void @f4(i8 *%ptr) {
+; CHECK-LABEL: f4:
+; CHECK: pfd 2, 0(%r2)
+; CHECK: br %r14
+  call void @llvm.prefetch(i8 *%ptr, i32 1, i32 0, i32 1)
+  ret void
+}
+
+; Check an address at the negative end of the range.
+define void @f5(i8 *%base, i64 %index) {
+; CHECK-LABEL: f5:
+; CHECK: pfd 2, -524288({{%r2,%r3|%r3,%r2}})
+; CHECK: br %r14
+  %add = add i64 %index, -524288
+  %ptr = getelementptr i8 *%base, i64 %add
+  call void @llvm.prefetch(i8 *%ptr, i32 1, i32 0, i32 1)
+  ret void
+}
+
+; Check an address at the positive end of the range.
+define void @f6(i8 *%base, i64 %index) {
+; CHECK-LABEL: f6:
+; CHECK: pfd 2, 524287({{%r2,%r3|%r3,%r2}})
+; CHECK: br %r14
+  %add = add i64 %index, 524287
+  %ptr = getelementptr i8 *%base, i64 %add
+  call void @llvm.prefetch(i8 *%ptr, i32 1, i32 0, i32 1)
+  ret void
+}
+
+; Check that the next address up still compiles.
+define void @f7(i8 *%base, i64 %index) {
+; CHECK-LABEL: f7:
+; CHECK: 524288
+; CHECK: pfd 2,
+; CHECK: br %r14
+  %add = add i64 %index, 524288
+  %ptr = getelementptr i8 *%base, i64 %add
+  call void @llvm.prefetch(i8 *%ptr, i32 1, i32 0, i32 1)
+  ret void
+}
+
+; Check pc-relative prefetches.
+define void @f8() {
+; CHECK-LABEL: f8:
+; CHECK: pfdrl 2, g
+; CHECK: br %r14
+  %ptr = getelementptr [4096 x i8] *@g, i64 0, i64 0
+  call void @llvm.prefetch(i8 *%ptr, i32 1, i32 0, i32 1)
+  ret void
+}