Imported Upstream version 5.18.0.246

Former-commit-id: 0c7ce5b1a7851e13f22acfd379b7f9fb304e4833

external/llvm/test/CodeGen/SystemZ/vec-const-06.ll

@@ -0,0 +1,43 @@
+; Test vector byte masks, v2f64 version.
+;
+; RUN: llc < %s -mtriple=s390x-linux-gnu -mcpu=z13 | FileCheck %s
+
+; Test an all-zeros vector.
+define <2 x double> @f1() {
+; CHECK-LABEL: f1:
+; CHECK: vgbm %v24, 0
+; CHECK: br %r14
+  ret <2 x double> zeroinitializer
+}
+
+; Test an all-ones vector.
+define <2 x double> @f2() {
+; CHECK-LABEL: f2:
+; CHECK: vgbm %v24, 65535
+; CHECK: br %r14
+  ret <2 x double> <double 0xffffffffffffffff, double 0xffffffffffffffff>
+}
+
+; Test a mixed vector (mask 0x8c76).
+define <2 x double> @f3() {
+; CHECK-LABEL: f3:
+; CHECK: vgbm %v24, 35958
+; CHECK: br %r14
+  ret <2 x double> <double 0xff000000ffff0000, double 0x00ffffff00ffff00>
+}
+
+; Test that undefs are treated as zero (mask 0x8c00).
+define <2 x double> @f4() {
+; CHECK-LABEL: f4:
+; CHECK: vgbm %v24, 35840
+; CHECK: br %r14
+  ret <2 x double> <double 0xff000000ffff0000, double undef>
+}
+
+; Test that we don't use VGBM if one of the bytes is not 0 or 0xff.
+define <2 x double> @f5() {
+; CHECK-LABEL: f5:
+; CHECK-NOT: vgbm
+; CHECK: br %r14
+  ret <2 x double> <double 0xfe000000ffff0000, double 0x00ffffff00ffff00>
+}