[DAGCombine] Catch the case where extract_vector_elt can cause an any_ext while proce...

[android-x86/external-llvm.git] / test / CodeGen / ARM / dagcombine-anyexttozeroext.ll

diff --git a/test/CodeGen/ARM/dagcombine-anyexttozeroext.ll b/test/CodeGen/ARM/dagcombine-anyexttozeroext.ll
index 8950abd..206371a 100644 (file)
--- a/test/CodeGen/ARM/dagcombine-anyexttozeroext.ll
+++ b/test/CodeGen/ARM/dagcombine-anyexttozeroext.ll
@@ -2,10 +2,10 @@
 
 ; CHECK-LABEL: f:
 define float @f(<4 x i16>* nocapture %in) {
-  ; CHECK: vldr
+  ; CHECK: vld1
   ; CHECK: vmovl.u16
   ; CHECK-NOT: vand
-  %1 = load <4 x i16>* %in
+  %1 = load <4 x i16>, <4 x i16>* %in
   ; CHECK: vcvt.f32.u32
   %2 = uitofp <4 x i16> %1 to <4 x float>
   %3 = extractelement <4 x float> %2, i32 0
@@ -19,12 +19,48 @@ define float @f(<4 x i16>* nocapture %in) {
   ret float %7
 }
 
+; CHECK-LABEL: g:
 define float @g(<4 x i16>* nocapture %in) {
   ; CHECK: vldr
-  %1 = load <4 x i16>* %in
-  ; CHECK-NOT: uxth
+  %1 = load <4 x i16>, <4 x i16>* %in
+
+  ; For now we're generating a vmov.16 and a uxth instruction.
+  ; The uxth is redundant, and we should be able to extend without
+  ; having to generate cross-domain copies. Once we can do this
+  ; we should modify the checks below.
+
+  ; CHECK: uxth
   %2 = extractelement <4 x i16> %1, i32 0
   ; CHECK: vcvt.f32.u32
   %3 = uitofp i16 %2 to float
   ret float %3
 }
+
+; The backend generates for the following code an
+; (and 0xff (i32 extract_vector_elt (zext load <4 x i8> to 4 x i16)))
+;
+; The and is not redundant and cannot be removed. Since
+; extract_vector_elt is doing an implicit any_ext, the and
+; is required to guarantee that the top bits are set to zero.
+
+; Ideally should be a zext from <4 x i8> to <4 x 32>.
+
+; CHECK-LABEL: h:
+; CHECK: vld1.32
+; CHECK: uxtb
+define <4 x i32> @h(<4 x i8> *%in) {
+  %1 = load <4 x i8>, <4 x i8>* %in, align 4
+  %2 = extractelement <4 x i8> %1, i32 0
+  %3 = zext i8 %2 to i32
+  %4 = insertelement <4 x i32> undef, i32 %3, i32 0
+  %5 = extractelement <4 x i8> %1, i32 1
+  %6 = zext i8 %5 to i32
+  %7 = insertelement <4 x i32> %4, i32 %6, i32 1
+  %8 = extractelement <4 x i8> %1, i32 2
+  %9 = zext i8 %8 to i32
+  %10 = insertelement <4 x i32> %7, i32 %9, i32 2
+  %11 = extractelement <4 x i8> %1, i32 3
+  %12 = zext i8 %11 to i32
+  %13 = insertelement <4 x i32> %10, i32 %12, i32 3
+  ret <4 x i32> %13
+}