Don't fold negative offsets into cp / dp accesses to avoid relocation errors.

This can happen if the address + addend is less than the start of the cp / dp.

llvm-svn: 143459

1 files changed, 25 insertions, 0 deletions

diff --git a/llvm/test/CodeGen/XCore/global_negative_offset.ll b/llvm/test/CodeGen/XCore/global_negative_offset.ll
new file mode 100644
index 00000000000..0328fb0460f
--- /dev/null
+++ b/llvm/test/CodeGen/XCore/global_negative_offset.ll
@@ -0,0 +1,25 @@
+; RUN: llc < %s -march=xcore | FileCheck %s
+
+; Don't fold negative offsets into cp / dp accesses to avoid a relocation
+; error if the address + addend is less than the start of the cp / dp.
+
+@a = external constant [0 x i32], section ".cp.rodata"
+@b = external global [0 x i32]
+
+define i32 *@f() nounwind {
+entry:
+; CHECK: f:
+; CHECK: ldaw r11, cp[a]
+; CHECK: sub r0, r11, 4
+	%0 = getelementptr [0 x i32]* @a, i32 0, i32 -1
+	ret i32* %0
+}
+
+define i32 *@g() nounwind {
+entry:
+; CHECK: g:
+; CHECK: ldaw [[REG:r[0-9]+]], dp[b]
+; CHECK: sub r0, [[REG]], 4
+	%0 = getelementptr [0 x i32]* @b, i32 0, i32 -1
+	ret i32* %0
+}