Add support for ARM ldrexd/strexd intrinsics. They both use i32 register pairs
to load/store i64 values. Since there's no current support to explicitly
declare such restrictions, implement it by using specific hardcoded register
pairs during isel.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@132248 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/CodeGen/ARM/ldstrexd.ll b/test/CodeGen/ARM/ldstrexd.ll
new file mode 100644
index 0000000..0c0911a
--- /dev/null
+++ b/test/CodeGen/ARM/ldstrexd.ll
@@ -0,0 +1,33 @@
+; RUN: llc < %s -mtriple=armv7-apple-darwin | FileCheck %s
+; RUN: llc < %s -mtriple=thumbv7-apple-darwin | FileCheck %s
+
+%0 = type { i32, i32 }
+
+; CHECK: f0:
+; CHECK: ldrexd
+define i64 @f0(i8* %p) nounwind readonly {
+entry:
+ %ldrexd = tail call %0 @llvm.arm.ldrexd(i8* %p)
+ %0 = extractvalue %0 %ldrexd, 1
+ %1 = extractvalue %0 %ldrexd, 0
+ %2 = zext i32 %0 to i64
+ %3 = zext i32 %1 to i64
+ %shl = shl nuw i64 %2, 32
+ %4 = or i64 %shl, %3
+ ret i64 %4
+}
+
+; CHECK: f1:
+; CHECK: strexd
+define i32 @f1(i8* %ptr, i64 %val) nounwind {
+entry:
+ %tmp4 = trunc i64 %val to i32
+ %tmp6 = lshr i64 %val, 32
+ %tmp7 = trunc i64 %tmp6 to i32
+ %strexd = tail call i32 @llvm.arm.strexd(i32 %tmp4, i32 %tmp7, i8* %ptr)
+ ret i32 %strexd
+}
+
+declare %0 @llvm.arm.ldrexd(i8*) nounwind readonly
+declare i32 @llvm.arm.strexd(i32, i32, i8*) nounwind
+