[CodeGenPrepare] Respect endianness in splitMergedValStore.
splitMergedValStore will split a store into two if target prefers this, or if
-force-split-store is passed.
This patch adds the missing handling for endianness in this function along
with a test case.
Review: Eli Friedman
https://reviews.llvm.org/D44396
llvm-svn: 327375
diff --git a/llvm/test/CodeGen/SystemZ/codegenprepare-splitstore.ll b/llvm/test/CodeGen/SystemZ/codegenprepare-splitstore.ll
new file mode 100644
index 0000000..0b1e2b4
--- /dev/null
+++ b/llvm/test/CodeGen/SystemZ/codegenprepare-splitstore.ll
@@ -0,0 +1,22 @@
+; Test that CodeGenPrepare respects endianness when splitting a store.
+;
+; RUN: llc -mtriple=s390x-linux-gnu -mcpu=z13 -force-split-store < %s | FileCheck %s
+
+define void @fun(i16* %Src, i16* %Dst) {
+; CHECK-LABEL: # %bb.0:
+; CHECK: lh %r0, 0(%r2)
+; CHECK-NEXT: stc %r0, 1(%r3)
+; CHECK-NEXT: srl %r0, 8
+; CHECK-NEXT: stc %r0, 0(%r3)
+; CHECK-NEXT: br %r14
+ %1 = load i16, i16* %Src
+ %2 = trunc i16 %1 to i8
+ %3 = lshr i16 %1, 8
+ %4 = trunc i16 %3 to i8
+ %5 = zext i8 %2 to i16
+ %6 = zext i8 %4 to i16
+ %7 = shl nuw i16 %6, 8
+ %8 = or i16 %7, %5
+ store i16 %8, i16* %Dst
+ ret void
+}