| ; RUN: llc -verify-machineinstrs -stack-symbol-ordering=0 < %s | FileCheck %s |
| |
| target datalayout = "e-i64:64-f80:128-n8:16:32:64-S128" |
| target triple = "x86_64-pc-linux-gnu" |
| |
| ; This test is checking to make sure that we reuse the same stack slots |
| ; for GC values spilled over two different call sites. Since the order |
| ; of GC arguments differ, niave lowering code would insert loads and |
| ; stores to rearrange items on the stack. We need to make sure (for |
| ; performance) that this doesn't happen. |
| define i32 @back_to_back_calls(ptr addrspace(1) %a, ptr addrspace(1) %b, ptr addrspace(1) %c) #1 gc "statepoint-example" { |
| ; CHECK-LABEL: back_to_back_calls |
| ; The exact stores don't matter, but there need to be three stack slots created |
| ; CHECK-DAG: movq %rdi, {{[0-9]*}}(%rsp) |
| ; CHECK-DAG: movq %rdx, {{[0-9]*}}(%rsp) |
| ; CHECK-DAG: movq %rsi, {{[0-9]*}}(%rsp) |
| ; There should be no more than three moves |
| ; CHECK-NOT: movq |
| %safepoint_token = tail call token (i64, i32, ptr, i32, i32, ...) @llvm.experimental.gc.statepoint.p0(i64 0, i32 0, ptr elementtype(void ()) undef, i32 0, i32 0, i32 0, i32 0) ["gc-live" (ptr addrspace(1) %a, ptr addrspace(1) %b, ptr addrspace(1) %c), "deopt" (i32 0, i32 -1, i32 0, i32 0, i32 0)] |
| %a1 = tail call coldcc ptr addrspace(1) @llvm.experimental.gc.relocate.p1(token %safepoint_token, i32 0, i32 0) |
| %b1 = tail call coldcc ptr addrspace(1) @llvm.experimental.gc.relocate.p1(token %safepoint_token, i32 0, i32 1) |
| %c1 = tail call coldcc ptr addrspace(1) @llvm.experimental.gc.relocate.p1(token %safepoint_token, i32 0, i32 2) |
| ; CHECK: callq |
| ; This is the key check. There should NOT be any memory moves here |
| ; CHECK-NOT: movq |
| %safepoint_token2 = tail call token (i64, i32, ptr, i32, i32, ...) @llvm.experimental.gc.statepoint.p0(i64 0, i32 0, ptr elementtype(void ()) undef, i32 0, i32 0, i32 0, i32 0) ["gc-live" (ptr addrspace(1) %c1, ptr addrspace(1) %b1, ptr addrspace(1) %a1), "deopt" (i32 0, i32 -1, i32 0, i32 0, i32 0)] |
| %a2 = tail call coldcc ptr addrspace(1) @llvm.experimental.gc.relocate.p1(token %safepoint_token2, i32 0, i32 2) |
| %b2 = tail call coldcc ptr addrspace(1) @llvm.experimental.gc.relocate.p1(token %safepoint_token2, i32 0, i32 1) |
| %c2 = tail call coldcc ptr addrspace(1) @llvm.experimental.gc.relocate.p1(token %safepoint_token2, i32 0, i32 0) |
| ; CHECK: callq |
| ret i32 1 |
| } |
| |
| ; This test simply checks that minor changes in vm state don't prevent slots |
| ; being reused for gc values. |
| define i32 @reserve_first(ptr addrspace(1) %a, ptr addrspace(1) %b, ptr addrspace(1) %c) #1 gc "statepoint-example" { |
| ; CHECK-LABEL: reserve_first |
| ; The exact stores don't matter, but there need to be three stack slots created |
| ; CHECK-DAG: movq %rdi, {{[0-9]*}}(%rsp) |
| ; CHECK-DAG: movq %rdx, {{[0-9]*}}(%rsp) |
| ; CHECK-DAG: movq %rsi, {{[0-9]*}}(%rsp) |
| %safepoint_token = tail call token (i64, i32, ptr, i32, i32, ...) @llvm.experimental.gc.statepoint.p0(i64 0, i32 0, ptr elementtype(void ()) undef, i32 0, i32 0, i32 0, i32 0) ["gc-live" (ptr addrspace(1) %a, ptr addrspace(1) %b, ptr addrspace(1) %c), "deopt" (i32 0, i32 -1, i32 0, i32 0, i32 0)] |
| %a1 = tail call coldcc ptr addrspace(1) @llvm.experimental.gc.relocate.p1(token %safepoint_token, i32 0, i32 0) |
| %b1 = tail call coldcc ptr addrspace(1) @llvm.experimental.gc.relocate.p1(token %safepoint_token, i32 0, i32 1) |
| %c1 = tail call coldcc ptr addrspace(1) @llvm.experimental.gc.relocate.p1(token %safepoint_token, i32 0, i32 2) |
| ; CHECK: callq |
| ; This is the key check. There should NOT be any memory moves here |
| ; CHECK-NOT: movq |
| %safepoint_token2 = tail call token (i64, i32, ptr, i32, i32, ...) @llvm.experimental.gc.statepoint.p0(i64 0, i32 0, ptr elementtype(void ()) undef, i32 0, i32 0, i32 0, i32 0) ["gc-live" (ptr addrspace(1) %c1, ptr addrspace(1) %b1, ptr addrspace(1) %a1), "deopt" (ptr addrspace(1) %a1, i32 0, ptr addrspace(1) %c1, i32 0, i32 0)] |
| %a2 = tail call coldcc ptr addrspace(1) @llvm.experimental.gc.relocate.p1(token %safepoint_token2, i32 0, i32 2) |
| %b2 = tail call coldcc ptr addrspace(1) @llvm.experimental.gc.relocate.p1(token %safepoint_token2, i32 0, i32 1) |
| %c2 = tail call coldcc ptr addrspace(1) @llvm.experimental.gc.relocate.p1(token %safepoint_token2, i32 0, i32 0) |
| ; CHECK: callq |
| ret i32 1 |
| } |
| |
| ; Check that we reuse the same stack slot across multiple calls. The use of |
| ; more than two calls here is critical. We've had a bug which allowed reuse |
| ; exactly once which went undetected for a long time. |
| define i32 @back_to_back_deopt(i32 %a, i32 %b, i32 %c) #1 |
| gc "statepoint-example" { |
| ; CHECK-LABEL: back_to_back_deopt |
| ; The exact stores don't matter, but there need to be three stack slots created |
| ; CHECK-DAG: movl %edi, 12(%rsp) |
| ; CHECK-DAG: movl %esi, 8(%rsp) |
| ; CHECK-DAG: movl %edx, 4(%rsp) |
| ; CHECK: callq |
| ; CHECK-DAG: movl %ebx, 12(%rsp) |
| ; CHECK-DAG: movl %ebp, 8(%rsp) |
| ; CHECK-DAG: movl %r14d, 4(%rsp) |
| ; CHECK: callq |
| ; CHECK-DAG: movl %ebx, 12(%rsp) |
| ; CHECK-DAG: movl %ebp, 8(%rsp) |
| ; CHECK-DAG: movl %r14d, 4(%rsp) |
| ; CHECK: callq |
| ; CHECK-DAG: movl %ebx, 12(%rsp) |
| ; CHECK-DAG: movl %ebp, 8(%rsp) |
| ; CHECK-DAG: movl %r14d, 4(%rsp) |
| ; CHECK: callq |
| call token (i64, i32, ptr, i32, i32, ...) @llvm.experimental.gc.statepoint.p0(i64 0, i32 0, ptr elementtype(void ()) undef, i32 0, i32 0, i32 0, i32 0) ["deopt" (i32 %a, i32 %b, i32 %c)] |
| call token (i64, i32, ptr, i32, i32, ...) @llvm.experimental.gc.statepoint.p0(i64 0, i32 0, ptr elementtype(void ()) undef, i32 0, i32 0, i32 0, i32 0) ["deopt" (i32 %a, i32 %b, i32 %c)] |
| call token (i64, i32, ptr, i32, i32, ...) @llvm.experimental.gc.statepoint.p0(i64 0, i32 0, ptr elementtype(void ()) undef, i32 0, i32 0, i32 0, i32 0) ["deopt" (i32 %a, i32 %b, i32 %c)] |
| call token (i64, i32, ptr, i32, i32, ...) @llvm.experimental.gc.statepoint.p0(i64 0, i32 0, ptr elementtype(void ()) undef, i32 0, i32 0, i32 0, i32 0) ["deopt" (i32 %a, i32 %b, i32 %c)] |
| ret i32 1 |
| } |
| |
| ; Test that stack slots are reused for invokes |
| define i32 @back_to_back_invokes(ptr addrspace(1) %a, ptr addrspace(1) %b, ptr addrspace(1) %c) #1 gc "statepoint-example" personality ptr @"personality_function" { |
| ; CHECK-LABEL: back_to_back_invokes |
| entry: |
| ; The exact stores don't matter, but there need to be three stack slots created |
| ; CHECK-DAG: movq %rdi, {{[0-9]*}}(%rsp) |
| ; CHECK-DAG: movq %rdx, {{[0-9]*}}(%rsp) |
| ; CHECK-DAG: movq %rsi, {{[0-9]*}}(%rsp) |
| ; CHECK: callq |
| %safepoint_token = invoke token (i64, i32, ptr, i32, i32, ...) @llvm.experimental.gc.statepoint.p0(i64 0, i32 0, ptr elementtype(void ()) undef, i32 0, i32 0, i32 0, i32 0) ["gc-live" (ptr addrspace(1) %a, ptr addrspace(1) %b, ptr addrspace(1) %c), "deopt" (i32 0, i32 -1, i32 0, i32 0, i32 0)] |
| to label %normal_return unwind label %exceptional_return |
| |
| normal_return: |
| %a1 = tail call coldcc ptr addrspace(1) @llvm.experimental.gc.relocate.p1(token %safepoint_token, i32 0, i32 0) |
| %b1 = tail call coldcc ptr addrspace(1) @llvm.experimental.gc.relocate.p1(token %safepoint_token, i32 0, i32 1) |
| %c1 = tail call coldcc ptr addrspace(1) @llvm.experimental.gc.relocate.p1(token %safepoint_token, i32 0, i32 2) |
| ; Should work even through bitcasts |
| ; This is the key check. There should NOT be any memory moves here |
| ; CHECK-NOT: movq |
| ; CHECK: callq |
| %safepoint_token2 = invoke token (i64, i32, ptr, i32, i32, ...) @llvm.experimental.gc.statepoint.p0(i64 0, i32 0, ptr elementtype(void ()) undef, i32 0, i32 0, i32 0, i32 0) ["gc-live" (ptr addrspace(1) %c1, ptr addrspace(1) %b1, ptr addrspace(1) %a1), "deopt" (i32 0, i32 -1, i32 0, i32 0, i32 0)] |
| to label %normal_return2 unwind label %exceptional_return2 |
| |
| normal_return2: |
| %a2 = tail call coldcc ptr addrspace(1) @llvm.experimental.gc.relocate.p1(token %safepoint_token2, i32 0, i32 2) |
| %b2 = tail call coldcc ptr addrspace(1) @llvm.experimental.gc.relocate.p1(token %safepoint_token2, i32 0, i32 1) |
| %c2 = tail call coldcc ptr addrspace(1) @llvm.experimental.gc.relocate.p1(token %safepoint_token2, i32 0, i32 0) |
| ret i32 1 |
| |
| exceptional_return: |
| %landing_pad = landingpad { ptr, i32 } |
| cleanup |
| ret i32 0 |
| |
| exceptional_return2: |
| %landing_pad2 = landingpad { ptr, i32 } |
| cleanup |
| ret i32 0 |
| } |
| |
| ; Function Attrs: nounwind |
| declare ptr addrspace(1) @llvm.experimental.gc.relocate.p1(token, i32, i32) #3 |
| |
| declare token @llvm.experimental.gc.statepoint.p0(i64, i32, ptr, i32, i32, ...) |
| |
| declare i32 @"personality_function"() |
| |
| attributes #1 = { uwtable } |