Implement initial memory alignment awareness for SSE instructions. Vector loads

and stores that have a specified alignment of less than 16 bytes now use
instructions that support misaligned memory references.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@40015 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 14 insertions, 0 deletions

diff --git a/test/CodeGen/X86/sse-align-2.ll b/test/CodeGen/X86/sse-align-2.ll
new file mode 100644
index 0000000000..b5c06748aa
--- /dev/null
+++ b/test/CodeGen/X86/sse-align-2.ll
@@ -0,0 +1,14 @@
+; RUN: llvm-as < %s | llc -march=x86-64 | grep movup | wc -l | grep 2
+
+define <4 x float> @foo(<4 x float>* %p, <4 x float> %x)
+{
+  %t = load <4 x float>* %p, align 4
+  %z = mul <4 x float> %t, %x
+  ret <4 x float> %z
+}
+define <2 x double> @bar(<2 x double>* %p, <2 x double> %x)
+{
+  %t = load <2 x double>* %p, align 8
+  %z = mul <2 x double> %t, %x
+  ret <2 x double> %z
+}