[AArch64] Inline callee if its target-features are a subset of the caller

Summary:
Similar to X86, it should be safe to inline callees if their target-features
are a subset of the caller. This change matches GCC's inlining behavior
with respect to attributes [1].

[1] https://gcc.gnu.org/onlinedocs/gcc/AArch64-Function-Attributes.html#AArch64-Function-Attributes

Reviewers: kristof.beyls, javed.absar, rengolin, t.p.northover

Reviewed By: t.p.northover

Subscribers: aemerson, eraman, llvm-commits

Differential Revision: https://reviews.llvm.org/D34698

llvm-svn: 306478

1 files changed, 40 insertions, 0 deletions

diff --git a/llvm/test/Transforms/Inline/AArch64/inline-target-attr.ll b/llvm/test/Transforms/Inline/AArch64/inline-target-attr.ll
new file mode 100644
index 00000000000..af87ff6e740
--- /dev/null
+++ b/llvm/test/Transforms/Inline/AArch64/inline-target-attr.ll
@@ -0,0 +1,40 @@
+; RUN: opt < %s -mtriple=aarch64-unknown-linux-gnu -S -inline | FileCheck %s
+; RUN: opt < %s -mtriple=aarch64-unknown-linux-gnu -S -passes='cgscc(inline)' | FileCheck %s
+; Check that we only inline when we have compatible target attributes.
+
+define i32 @foo() #0 {
+entry:
+  %call = call i32 (...) @baz()
+  ret i32 %call
+; CHECK-LABEL: foo
+; CHECK: call i32 (...) @baz()
+}
+declare i32 @baz(...) #0
+
+define i32 @bar() #1 {
+entry:
+  %call = call i32 @foo()
+  ret i32 %call
+; CHECK-LABEL: bar
+; CHECK: call i32 (...) @baz()
+}
+
+define i32 @qux() #0 {
+entry:
+  %call = call i32 @bar()
+  ret i32 %call
+; CHECK-LABEL: qux
+; CHECK: call i32 @bar()
+}
+
+define i32 @strict_align() #2 {
+entry:
+  %call = call i32 @foo()
+  ret i32 %call
+; CHECK-LABEL: strict_align
+; CHECK: call i32 (...) @baz()
+}
+
+attributes #0 = { "target-cpu"="generic" "target-features"="+crc,+neon" }
+attributes #1 = { "target-cpu"="generic" "target-features"="+crc,+neon,+crypto" }
+attributes #2 = { "target-cpu"="generic" "target-features"="+crc,+neon,+strict-align" }