Vendor import of llvm trunk r135360:vendor/llvm/llvm-r135360

http://llvm.org/svn/llvm-project/llvm/trunk@135360

1 files changed, 41 insertions, 0 deletions

diff --git a/test/CodeGen/X86/zext-fold.ll b/test/CodeGen/X86/zext-fold.ll
new file mode 100644
index 000000000000..b3f5cdbb88d1
--- /dev/null
+++ b/test/CodeGen/X86/zext-fold.ll
@@ -0,0 +1,41 @@
+; RUN: llc < %s -march=x86 | FileCheck %s
+
+;; Simple case
+define i32 @test1(i8 %x) nounwind readnone {
+  %A = and i8 %x, -32
+  %B = zext i8 %A to i32
+  ret i32 %B
+}
+; CHECK: test1
+; CHECK: movzbl
+; CHECK-NEXT: andl {{.*}}224
+
+;; Multiple uses of %x but easily extensible. 
+define i32 @test2(i8 %x) nounwind readnone {
+  %A = and i8 %x, -32
+  %B = zext i8 %A to i32
+  %C = or i8 %x, 63
+  %D = zext i8 %C to i32
+  %E = add i32 %B, %D
+  ret i32 %E
+}
+; CHECK: test2
+; CHECK: movzbl
+; CHECK: orl $63
+; CHECK: andl $224
+
+declare void @use(i32, i8)
+
+;; Multiple uses of %x where we shouldn't extend the load.
+define void @test3(i8 %x) nounwind readnone {
+  %A = and i8 %x, -32
+  %B = zext i8 %A to i32
+  call void @use(i32 %B, i8 %x)
+  ret void
+}
+; CHECK: test3
+; CHECK: movzbl 16(%esp), [[REGISTER:%e[a-z]{2}]]
+; CHECK-NEXT: movl [[REGISTER]], 4(%esp)
+; CHECK-NEXT: andl $224, [[REGISTER]]
+; CHECK-NEXT: movl [[REGISTER]], (%esp)
+; CHECK-NEXT: call{{.*}}use