[mips] Custom-lower ISD::FRAME_TO_ARGS_OFFSET node.

Patch by Sasa Stankovic.

llvm-svn: 167548

1 files changed, 63 insertions, 0 deletions

diff --git a/llvm/test/CodeGen/Mips/eh-dwarf-cfa.ll b/llvm/test/CodeGen/Mips/eh-dwarf-cfa.ll
new file mode 100644
index 00000000000..3a21332b5c5
--- /dev/null
+++ b/llvm/test/CodeGen/Mips/eh-dwarf-cfa.ll
@@ -0,0 +1,63 @@
+; RUN: llc -march=mipsel -mcpu=mips32 < %s | FileCheck %s
+; RUN: llc -march=mips64el -mcpu=mips64 < %s | \
+; RUN:      FileCheck %s -check-prefix=CHECK-MIPS64
+
+declare i8* @llvm.eh.dwarf.cfa(i32) nounwind
+declare i8* @llvm.frameaddress(i32) nounwind readnone
+
+define i8* @f1() nounwind {
+entry:
+  %x = alloca [32 x i8], align 1
+  %0 = call i8* @llvm.eh.dwarf.cfa(i32 0)
+  ret i8* %0
+
+; CHECK:        addiu   $sp, $sp, -32
+; CHECK:        addiu   $2, $sp, 32
+}
+
+
+define i8* @f2() nounwind {
+entry:
+  %x = alloca [65536 x i8], align 1
+  %0 = call i8* @llvm.eh.dwarf.cfa(i32 0)
+  ret i8* %0
+
+; check stack size (65536 + 8)
+; CHECK:        lui     $[[R0:[a-z0-9]+]], 65535
+; CHECK:        addiu   $[[R0]], $[[R0]], -8
+; CHECK:        addu    $sp, $sp, $[[R0]]
+
+; check return value ($sp + stack size)
+; CHECK:        lui     $[[R1:[a-z0-9]+]], 1
+; CHECK:        addu    $[[R1]], $sp, $[[R1]]
+; CHECK:        addiu   $2, $[[R1]], 8
+}
+
+
+define i32 @f3() nounwind {
+entry:
+  %x = alloca [32 x i8], align 1
+  %0 = call i8* @llvm.eh.dwarf.cfa(i32 0)
+  %1 = ptrtoint i8* %0 to i32
+  %2 = call i8* @llvm.frameaddress(i32 0)
+  %3 = ptrtoint i8* %2 to i32
+  %add = add i32 %1, %3
+  ret i32 %add
+
+; CHECK:        addiu   $sp, $sp, -40
+
+; check return value ($fp + stack size + $fp)
+; CHECK:        addiu   $[[R0:[a-z0-9]+]], $fp, 40
+; CHECK:        addu    $2, $[[R0]], $fp
+}
+
+
+define i8* @f4() nounwind {
+entry:
+  %x = alloca [32 x i8], align 1
+  %0 = call i8* @llvm.eh.dwarf.cfa(i32 0)
+  ret i8* %0
+
+; CHECK-MIPS64:        daddiu   $sp, $sp, -32
+; CHECK-MIPS64:        daddiu   $2, $sp, 32
+}