[AArch64] Fix miscompile of comparison with 0xffffffffffffffff

Some literals in the AArch64 backend had 15 'f's rather than 16, causing
comparisons with a constant 0xffffffffffffffff to be miscompiled.

llvm-svn: 221157

1 files changed, 36 insertions, 0 deletions

diff --git a/llvm/test/CodeGen/AArch64/cmp-const-max.ll b/llvm/test/CodeGen/AArch64/cmp-const-max.ll
new file mode 100644
index 00000000000..0431e391a30
--- /dev/null
+++ b/llvm/test/CodeGen/AArch64/cmp-const-max.ll
@@ -0,0 +1,36 @@
+; RUN: llc -verify-machineinstrs -aarch64-atomic-cfg-tidy=0 < %s -mtriple=aarch64-none-eabihf -fast-isel=false | FileCheck %s
+
+
+define i32 @ule_64_max(i64 %p) {
+entry:
+; CHECK-LABEL: ule_64_max:
+; CHECK: cmn x0, #1
+; CHECK: b.hi [[RET_ZERO:.LBB[0-9]+_[0-9]+]]
+  %cmp = icmp ule i64 %p, 18446744073709551615 ; 0xffffffffffffffff
+  br i1 %cmp, label %ret_one, label %ret_zero
+
+ret_one:
+  ret i32 1
+
+ret_zero:
+; CHECK: [[RET_ZERO]]:
+; CHECK-NEXT: mov w0, wzr
+  ret i32 0
+}
+
+define i32 @ugt_64_max(i64 %p) {
+entry:
+; CHECK-LABEL: ugt_64_max:
+; CHECK: cmn x0, #1
+; CHECK: b.ls [[RET_ZERO:.LBB[0-9]+_[0-9]+]]
+  %cmp = icmp ugt i64 %p, 18446744073709551615 ; 0xffffffffffffffff
+  br i1 %cmp, label %ret_one, label %ret_zero
+
+ret_one:
+  ret i32 1
+
+ret_zero:
+; CHECK: [[RET_ZERO]]:
+; CHECK-NEXT: mov w0, wzr
+  ret i32 0
+}