[mips] Missing test case

Add missing testcase from r272666.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@272784 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/CodeGen/Mips/cstmaterialization/stack.ll b/test/CodeGen/Mips/cstmaterialization/stack.ll
new file mode 100644 (file)
index 0000000..7266d00
--- /dev/null
+++ b/test/CodeGen/Mips/cstmaterialization/stack.ll
@@ -0,0 +1,54 @@
+; RUN: llc -march=mipsel -mcpu=mips32 < %s | FileCheck %s -check-prefix=CHECK-MIPS32
+; RUN: llc -march=mips64el -mcpu=mips64 < %s | \
+; RUN:      FileCheck %s -check-prefix=CHECK-MIPS64
+; RUN: llc -march=mipsel -mcpu=mips64 -target-abi n32 < %s | \
+; RUN:      FileCheck %s -check-prefix=CHECK-MIPSN32
+
+; Test that the expansion of ADJCALLSTACKDOWN and ADJCALLSTACKUP generate
+; (d)subu and (d)addu rather than just (d)addu. The (d)subu sequences are
+; generally shorter as the constant that has to be materialized is smaller.
+
+define i32 @main() {
+entry:
+  %z = alloca [1048576 x i8], align 1
+  %arraydecay = getelementptr inbounds [1048576 x i8], [1048576 x i8]* %z, i32 0, i32 0
+  %call = call i32 @foo(i8* %arraydecay)
+  ret i32 0
+; CHECK-LABEL: main
+
+; CHECK-MIPS32: lui   $[[R0:[0-9]+]], 16
+; CHECK-MIPS32: addiu $[[R0]], $[[R0]], 24
+; CHECK-MIPS32: subu  $sp, $sp, $[[R0]]
+
+; CHECK-MIPS32: lui   $[[R1:[0-9]+]], 16
+; CHECK-MIPS32: addiu $[[R1]], $[[R1]], 24
+; CHECK-MIPS32: addu  $sp, $sp, $[[R1]]
+
+; CHECK-MIPS64: lui     $[[R0:[0-9]+]], 1
+; CHECK-MIPS64: daddiu  $[[R0]], $[[R0]], 32
+; CHECK-MIPS64: dsubu   $sp, $sp, $[[R0]]
+
+; FIXME:
+; These are here to match other lui's used in address computations. We need to
+; investigate why address computations are not CSE'd. Or implement it.
+
+; CHECK-MIPS64: lui
+; CHECK-MIPS64: lui
+; CHECK-MIPS64: lui
+; CHECK-MIPS64: lui
+
+; CHECK-MIPS64: lui     $[[R1:[0-9]+]], 16
+; CHECK-MIPS64: daddiu  $[[R1]], $[[R1]], 32
+; CHECK-MIPS64: daddu   $sp, $sp, $[[R1]]
+
+; CHECK-MIPSN32: lui   $[[R0:[0-9]+]], 16
+; CHECK-MIPSN32: addiu $[[R0]], $[[R0]], 16
+; CHECK-MIPSN32: subu  $sp, $sp, $[[R0]]
+
+; CHECK-MIPSN32: lui   $[[R1:[0-9]+]], 16
+; CHECK-MIPSN32: addiu $[[R1]], $[[R1]], 16
+; CHECK-MIPSN32: addu  $sp, $sp, $[[R1]]
+
+}
+
+declare i32 @foo(i8*)