[Hexagon] Use offsets relative to FP+8 in .cfi_offset instructions
When generating .cfi_offset instructions, make sure that the offset is
calculated with respect to the register used to define the CFA (which is
currently always FP+8).
llvm-svn: 269191
diff --git a/llvm/test/CodeGen/Hexagon/cfi-offset.ll b/llvm/test/CodeGen/Hexagon/cfi-offset.ll
new file mode 100644
index 0000000..100034a0
--- /dev/null
+++ b/llvm/test/CodeGen/Hexagon/cfi-offset.ll
@@ -0,0 +1,43 @@
+; RUN: llc -march=hexagon < %s | FileCheck %s
+; Check that all the offsets in the .cfi_offset instructions are negative.
+; They are all based on R30+8 which points to the pair FP/LR stored by an
+; allocframe. Since the stack grows towards negative addresses, anything
+; in the current stack frame will have a negative offset with respect to
+; R30+8.
+
+; CHECK: cfi_def_cfa r30
+; CHECK-NOT: .cfi_offset r{{[0-9]+}}, {{[^-]}}
+
+target triple = "hexagon"
+
+define i64 @_Z3fooxxx(i64 %x, i64 %y, i64 %z) #0 personality i8* bitcast (i32 (...)* @__gxx_personality_v0 to i8*) {
+entry:
+ %call = invoke i64 @_Z3barxxx(i64 %x, i64 %y, i64 %z)
+ to label %try.cont unwind label %lpad
+
+lpad: ; preds = %entry
+ %0 = landingpad { i8*, i32 }
+ catch i8* null
+ %1 = extractvalue { i8*, i32 } %0, 0
+ %2 = tail call i8* @__cxa_begin_catch(i8* %1) #1
+ tail call void @__cxa_end_catch()
+ br label %try.cont
+
+try.cont: ; preds = %entry, %lpad
+ %a.0 = phi i64 [ 0, %lpad ], [ %call, %entry ]
+ %mul = mul nsw i64 %y, %x
+ %sub = sub i64 %mul, %z
+ %add = add nsw i64 %sub, %a.0
+ ret i64 %add
+}
+
+declare i64 @_Z3barxxx(i64, i64, i64) #0
+
+declare i32 @__gxx_personality_v0(...)
+
+declare i8* @__cxa_begin_catch(i8*)
+
+declare void @__cxa_end_catch()
+
+attributes #0 = { "disable-tail-calls"="false" "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-jump-tables"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="hexagonv60" "target-features"="-hvx,-hvx-double" "unsafe-fp-math"="false" "use-soft-float"="false" }
+attributes #1 = { nounwind }