Don't use INSERT_SUBREG to model anyext operations on x86-64, as it
leads to partial-register definitions. To help avoid redundant
zero-extensions, also teach the h-register matching patterns that
use movzbl to match anyext as well as zext.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@80099 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/CodeGen/X86/anyext.ll b/test/CodeGen/X86/anyext.ll
new file mode 100644
index 0000000..c5f03ab
--- /dev/null
+++ b/test/CodeGen/X86/anyext.ll
@@ -0,0 +1,18 @@
+; RUN: llvm-as < %s | llc -march=x86-64 | grep movzbl | count 2
+
+; Use movzbl to avoid partial-register updates.
+
+define i32 @foo(i32 %p, i8 zeroext %x) nounwind {
+ %q = trunc i32 %p to i8
+ %r = udiv i8 %q, %x
+ %s = zext i8 %r to i32
+ %t = and i32 %s, 1
+ ret i32 %t
+}
+define i32 @bar(i32 %p, i16 zeroext %x) nounwind {
+ %q = trunc i32 %p to i16
+ %r = udiv i16 %q, %x
+ %s = zext i16 %r to i32
+ %t = and i32 %s, 1
+ ret i32 %t
+}