1 files changed, 26 insertions, 0 deletions
diff --git a/test/CodeGen/X86/i386-tlscall-fastregalloc.ll b/test/CodeGen/X86/i386-tlscall-fastregalloc.ll
new file mode 100644
index 000000000000..775c0c1b3784
--- /dev/null
+++ b/test/CodeGen/X86/i386-tlscall-fastregalloc.ll
@@ -0,0 +1,26 @@
+; RUN: llc %s -o - -O0 -regalloc=fast | FileCheck %s
+target datalayout = "e-m:o-p:32:32-f64:32:64-f80:128-n8:16:32-S128"
+target triple = "i386-apple-macosx10.10"
+
+@c = external global i8, align 1
+@p = thread_local global i8* null, align 4
+
+; Check that regalloc fast correctly preserves EAX that is set by the TLS call
+; until the actual use.
+; PR26485.
+;
+; CHECK-LABEL: f:
+; Get p.
+; CHECK: movl _p@{{[0-9a-zA-Z]+}}, [[P_ADDR:%[a-z]+]]
+; CHECK-NEXT: calll *([[P_ADDR]])
+; At this point eax contiains the address of p.
+; Load c address.
+; Make sure we do not clobber eax.
+; CHECK-NEXT: movl L_c{{[^,]*}}, [[C_ADDR:%e[b-z]x+]]
+; Store c address into p.
+; CHECK-NEXT: movl [[C_ADDR]], (%eax)
+define void @f() #0 {
+entry:
+  store i8* @c, i8** @p, align 4
+  ret void
+}