diff options
| -rw-r--r-- | llvm/lib/Target/X86/X86FrameLowering.cpp | 2 | ||||
| -rw-r--r-- | llvm/test/CodeGen/X86/segmented-stacks.ll | 41 |
2 files changed, 41 insertions, 2 deletions
diff --git a/llvm/lib/Target/X86/X86FrameLowering.cpp b/llvm/lib/Target/X86/X86FrameLowering.cpp index e310fe06911..1fb6eb33872 100644 --- a/llvm/lib/Target/X86/X86FrameLowering.cpp +++ b/llvm/lib/Target/X86/X86FrameLowering.cpp @@ -2212,7 +2212,7 @@ HasNestArgument(const MachineFunction *MF) { const Function &F = MF->getFunction(); for (Function::const_arg_iterator I = F.arg_begin(), E = F.arg_end(); I != E; I++) { - if (I->hasNestAttr()) + if (I->hasNestAttr() && !I->use_empty()) return true; } return false; diff --git a/llvm/test/CodeGen/X86/segmented-stacks.ll b/llvm/test/CodeGen/X86/segmented-stacks.ll index fac9a33394b..c4539f7b125 100644 --- a/llvm/test/CodeGen/X86/segmented-stacks.ll +++ b/llvm/test/CodeGen/X86/segmented-stacks.ll @@ -611,7 +611,7 @@ define void @test_nostack() #0 { ; X32-Linux-NOT: calll __morestack ; X64-Linux-LABEL: test_nostack: -; X32-Linux-NOT: callq __morestack +; X64-Linux-NOT: callq __morestack ; X32ABI-LABEL: test_nostack: ; X32ABI-NOT: callq __morestack @@ -688,6 +688,45 @@ define i32 @test_sibling_call_empty_frame(i32 %x) #0 { } +; Test that unused nested argument doesn't need saving/restoring. + +define i32 @test_nested_unused(i32 * nest %unused) #0 { + %mem = alloca i32, i32 10 + call void @dummy_use (i32* %mem, i32 10) + ret i32 123 + +; X64-Linux-LABEL: test_nested_unused: +; X64-Linux-NOT: movq %r10, %rax +; X64-Linux: callq __morestack +; X64-Linux-NOT: movq %rax, %r10 + +; X64-Darwin-LABEL: test_nested_unused: +; X64-Darwin-NOT: movq %r10, %rax +; X64-Darwin: callq ___morestack +; X64-Darwin-NOT: movq %rax, %r10 + +; X64-FreeBSD-LABEL: test_nested_unused: +; X64-FreeBSD-NOT: movq %r10, %rax +; X64-FreeBSD: callq __morestack +; X64-FreeBSD-NOT: movq %rax, %r10 + +; X64-DFlyBSD-LABEL: test_nested_unused: +; X64-DFlyBSD-NOT: movq %r10, %rax +; X64-DFlyBSD: callq __morestack +; X64-DFlyBSD-NOT: movq %rax, %r10 + +; X64-MinGW-LABEL: test_nested_unused: +; X64-MinGW-NOT: movq %r10, %rax +; X64-MinGW: callq __morestack +; X64-MinGW-NOT: movq %rax, %r10 + +; X32ABI-LABEL: test_nested_unused: +; X32ABI-NOT: movl %r10d, %eax +; X32ABI: callq __morestack +; X32ABI-NOT: movq %rax, %r10 + +} + attributes #0 = { "split-stack" } ; X64-Linux-Large: .rodata |
