X86: Introduce relocImm-based patterns for cmp.

Differential Revision: https://reviews.llvm.org/D28690

llvm-svn: 294636
diff --git a/llvm/test/CodeGen/X86/absolute-cmp.ll b/llvm/test/CodeGen/X86/absolute-cmp.ll
new file mode 100644
index 0000000..01e8a90
--- /dev/null
+++ b/llvm/test/CodeGen/X86/absolute-cmp.ll
@@ -0,0 +1,39 @@
+; RUN: llc < %s | FileCheck %s
+; RUN: llc -relocation-model=pic < %s | FileCheck %s
+
+target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-unknown-linux-gnu"
+
+@cmp8 = external hidden global i8, !absolute_symbol !0
+@cmp32 = external hidden global i8, !absolute_symbol !1
+
+declare void @f()
+
+define void @foo8(i64 %val) {
+  ; CHECK: cmpq $cmp8@ABS8, %rdi
+  %cmp = icmp ule i64 %val, ptrtoint (i8* @cmp8 to i64)
+  br i1 %cmp, label %t, label %f
+
+t:
+  call void @f()
+  ret void
+
+f:
+  ret void
+}
+
+define void @foo32(i64 %val) {
+  ; CHECK: cmpq $cmp32, %rdi
+  %cmp = icmp ule i64 %val, ptrtoint (i8* @cmp32 to i64)
+  br i1 %cmp, label %t, label %f
+
+t:
+  call void @f()
+  ret void
+
+f:
+  ret void
+}
+
+!0 = !{i64 0, i64 128}
+!1 = !{i64 0, i64 2147483648}