1 files changed, 48 insertions, 0 deletions
diff --git a/test/CodeGen/X86/memcpy-struct-by-value.ll b/test/CodeGen/X86/memcpy-struct-by-value.ll
new file mode 100644
index 0000000000000..2e7a64d84000d
--- /dev/null
+++ b/test/CodeGen/X86/memcpy-struct-by-value.ll
@@ -0,0 +1,48 @@
+; RUN: llc -mtriple=x86_64-linux-gnu -mattr=-ermsb < %s -o - | FileCheck %s --check-prefix=ALL --check-prefix=NOFAST
+; RUN: llc -mtriple=x86_64-linux-gnu -mattr=+ermsb < %s -o - | FileCheck %s --check-prefix=ALL --check-prefix=FAST
+; RUN: llc -mtriple=i686-linux-gnu -mattr=-ermsb < %s -o - | FileCheck %s --check-prefix=ALL --check-prefix=NOFAST32
+; RUN: llc -mtriple=i686-linux-gnu -mattr=+ermsb < %s -o - | FileCheck %s --check-prefix=ALL --check-prefix=FAST
+; RUN: llc -mtriple=x86_64-linux-gnu -mcpu=generic < %s -o - | FileCheck %s --check-prefix=ALL --check-prefix=NOFAST
+; RUN: llc -mtriple=x86_64-linux-gnu -mcpu=haswell < %s -o - | FileCheck %s --check-prefix=ALL --check-prefix=FAST
+; RUN: llc -mtriple=x86_64-linux-gnu -mcpu=skylake < %s -o - | FileCheck %s --check-prefix=ALL --check-prefix=FAST
+; FIXME: The documentation states that ivybridge has ermsb, but this is not
+; enabled right now since I could not confirm by testing.
+; RUN: llc -mtriple=x86_64-linux-gnu -mcpu=ivybridge < %s -o - | FileCheck %s --check-prefix=ALL --check-prefix=NOFAST
+
+%struct.large = type { [4096 x i8] }
+
+declare void @foo(%struct.large* align 8 byval) nounwind
+
+define void @test1(%struct.large* nocapture %x) nounwind {
+  call void @foo(%struct.large* align 8 byval %x)
+  ret void
+
+; ALL-LABEL: test1:
+; NOFAST: rep;movsq
+; NOFAST32: rep;movsl
+; FAST: rep;movsb
+}
+
+define void @test2(%struct.large* nocapture %x) nounwind minsize {
+  call void @foo(%struct.large* align 8 byval %x)
+  ret void
+
+; ALL-LABEL: test2:
+; NOFAST: rep;movsq
+; NOFAST32: rep;movsl
+; FAST: rep;movsb
+}
+
+%struct.large_oddsize = type { [4095 x i8] }
+
+declare void @foo_oddsize(%struct.large_oddsize* align 8 byval) nounwind
+
+define void @test3(%struct.large_oddsize* nocapture %x) nounwind minsize {
+  call void @foo_oddsize(%struct.large_oddsize* align 8 byval %x)
+  ret void
+
+; ALL-LABEL: test3:
+; NOFAST: rep;movsb
+; NOFAST32: rep;movsb
+; FAST: rep;movsb
+}