[X86] Add tests for sspstrong with phi nodes (NFC)

Author: nikic

llvm/test/CodeGen/X86/stack-protector-phi.ll

@@ -0,0 +1,66 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 5
+; RUN: llc -mtriple=x86_64-unknown-linux-gnu < %s | FileCheck %s
+
+define void @test_phi_diff_size(i1 %c) sspstrong {
+; CHECK-LABEL: test_phi_diff_size:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    testb $1, %dil
+; CHECK-NEXT:    je .LBB0_1
+; CHECK-NEXT:  # %bb.2: # %if
+; CHECK-NEXT:    leaq -{{[0-9]+}}(%rsp), %rax
+; CHECK-NEXT:    movq $0, (%rax)
+; CHECK-NEXT:    retq
+; CHECK-NEXT:  .LBB0_1:
+; CHECK-NEXT:    leaq -{{[0-9]+}}(%rsp), %rax
+; CHECK-NEXT:    movq $0, (%rax)
+; CHECK-NEXT:    retq
+entry:
+  %a = alloca i64
+  br i1 %c, label %if, label %join
+
+if:
+  %gep = getelementptr i8, ptr %a, i64 4
+  br label %join
+
+join:
+  %phi = phi ptr [ %a, %entry ], [ %gep, %if ]
+  store i64 0, ptr %phi
+  ret void
+}
+
+define void @test_phi_loop(i1 %c) sspstrong {
+; CHECK-LABEL: test_phi_loop:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    pushq %rbp
+; CHECK-NEXT:    .cfi_def_cfa_offset 16
+; CHECK-NEXT:    .cfi_offset %rbp, -16
+; CHECK-NEXT:    movq %rsp, %rbp
+; CHECK-NEXT:    .cfi_def_cfa_register %rbp
+; CHECK-NEXT:    andq $-131072, %rsp # imm = 0xFFFE0000
+; CHECK-NEXT:    subq $262144, %rsp # imm = 0x40000
+; CHECK-NEXT:    movq %rsp, %rax
+; CHECK-NEXT:    .p2align 4
+; CHECK-NEXT:  .LBB1_1: # %loop
+; CHECK-NEXT:    # =>This Inner Loop Header: Depth=1
+; CHECK-NEXT:    movq $0, (%rax)
+; CHECK-NEXT:    addq $4, %rax
+; CHECK-NEXT:    testb $1, %dil
+; CHECK-NEXT:    jne .LBB1_1
+; CHECK-NEXT:  # %bb.2: # %exit
+; CHECK-NEXT:    movq %rbp, %rsp
+; CHECK-NEXT:    popq %rbp
+; CHECK-NEXT:    .cfi_def_cfa %rsp, 8
+; CHECK-NEXT:    retq
+entry:
+  %a = alloca <10000 x i64>
+  br label %loop
+
+loop:
+  %phi = phi ptr [ %a, %entry ], [ %gep, %loop ]
+  store i64 0, ptr %phi
+  %gep = getelementptr i8, ptr %phi, i64 4
+  br i1 %c, label %loop, label %exit
+
+exit:
+  ret void
+}