[Tests] Fill out a few tests around gc relocation uniquing

llvm-svn: 353773

1 files changed, 36 insertions, 3 deletions

diff --git a/llvm/test/CodeGen/X86/statepoint-uniqueing.ll b/llvm/test/CodeGen/X86/statepoint-uniqueing.ll
index 337bc7fcc33..ae7c076ab12 100644
--- a/llvm/test/CodeGen/X86/statepoint-uniqueing.ll
+++ b/llvm/test/CodeGen/X86/statepoint-uniqueing.ll
@@ -1,9 +1,6 @@
 ; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
 ; RUN: llc -verify-machineinstrs < %s | FileCheck %s
 
-; Checks for a crash we had when two gc.relocate calls would
-; relocating identical values
-
 target datalayout = "e-i64:64-f80:128-n8:16:32:64-S128"
 target triple = "x86_64-pc-linux-gnu"
 
@@ -13,6 +10,7 @@ declare token @llvm.experimental.gc.statepoint.p0f_isVoidf(i64, i32, void ()*, i
 declare i32 addrspace(1)* @llvm.experimental.gc.relocate.p1i32(token, i32, i32) #3
 declare i8 addrspace(1)* @llvm.experimental.gc.relocate.p1i8(token, i32, i32) #3
 
+;; Two gc.relocates of the same input, should require only a single spill/fill
 define void @test_gcrelocate_uniqueing(i32 addrspace(1)* %ptr) gc "statepoint-example" {
 ; CHECK-LABEL: test_gcrelocate_uniqueing:
 ; CHECK:       # %bb.0:
@@ -36,6 +34,7 @@ define void @test_gcrelocate_uniqueing(i32 addrspace(1)* %ptr) gc "statepoint-ex
   ret void
 }
 
+;; Two gc.relocates of a bitcasted pointer should only require a single spill/fill
 define void @test_gcptr_uniqueing(i32 addrspace(1)* %ptr) gc "statepoint-example" {
 ; CHECK-LABEL: test_gcptr_uniqueing:
 ; CHECK:       # %bb.0:
@@ -59,3 +58,37 @@ define void @test_gcptr_uniqueing(i32 addrspace(1)* %ptr) gc "statepoint-example
   call void (...) @use(i32 addrspace(1)* %a, i8 addrspace(1)* %b)
   ret void
 }
+
+;; A GC value is not dead, and does need to be spill (but not filed) if
+;; that same value is also in the deopt list.
+define void @test_deopt_use(i32 addrspace(1)* %ptr) gc "statepoint-example" {
+; CHECK-LABEL: test_deopt_use:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    subq $24, %rsp
+; CHECK-NEXT:    .cfi_def_cfa_offset 32
+; CHECK-NEXT:    movq %rdi, {{[0-9]+}}(%rsp)
+; CHECK-NEXT:    callq f
+; CHECK-NEXT:  .Ltmp2:
+; CHECK-NEXT:    addq $24, %rsp
+; CHECK-NEXT:    .cfi_def_cfa_offset 8
+; CHECK-NEXT:    retq
+  tail call token (i64, i32, void ()*, i32, i32, ...)
+      @llvm.experimental.gc.statepoint.p0f_isVoidf(i64 0, i32 0, void ()* @f, i32 0, i32 0, i32 0, i32 2, i32 addrspace(1)* %ptr, i32 undef, i32 addrspace(1)* %ptr)
+  ret void
+}
+
+;; A GC value which is truely unused does not need to spilled or filled.
+define void @test_dse(i32 addrspace(1)* %ptr) gc "statepoint-example" {
+; CHECK-LABEL: test_dse:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    pushq %rax
+; CHECK-NEXT:    .cfi_def_cfa_offset 16
+; CHECK-NEXT:    callq f
+; CHECK-NEXT:  .Ltmp3:
+; CHECK-NEXT:    popq %rax
+; CHECK-NEXT:    .cfi_def_cfa_offset 8
+; CHECK-NEXT:    retq
+  tail call token (i64, i32, void ()*, i32, i32, ...)
+      @llvm.experimental.gc.statepoint.p0f_isVoidf(i64 0, i32 0, void ()* @f, i32 0, i32 0, i32 0, i32 2, i32 undef, i32 undef, i32 addrspace(1)* %ptr)
+  ret void
+}