[x86] add test for 'sbb' false dependency stall; NFC

Author: rotateright

llvm/test/CodeGen/X86/sbb-false-dep.ll

@@ -0,0 +1,68 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
+; RUN: llc < %s -mtriple=x86_64-- -mcpu=sandybridge | FileCheck %s --check-prefixes=CHECK
+
+%struct.y_s = type { i64*, i64* }
+
+define i32 @mallocbench_gs(i32* noundef %0, %struct.y_s* noundef %1, i32 noundef %2, i32 noundef %3, i32 noundef %4) nounwind {
+; CHECK-LABEL: mallocbench_gs:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    pushq %rbp
+; CHECK-NEXT:    pushq %r15
+; CHECK-NEXT:    pushq %r14
+; CHECK-NEXT:    pushq %r13
+; CHECK-NEXT:    pushq %r12
+; CHECK-NEXT:    pushq %rbx
+; CHECK-NEXT:    pushq %rax
+; CHECK-NEXT:    movl %r8d, %r13d
+; CHECK-NEXT:    movl %ecx, %r14d
+; CHECK-NEXT:    movl %edx, %r15d
+; CHECK-NEXT:    movq %rsi, %rbx
+; CHECK-NEXT:    movq %rdi, %r12
+; CHECK-NEXT:    movq (%rsi), %rdi
+; CHECK-NEXT:    movq 8(%rsi), %rsi
+; CHECK-NEXT:    movq %rbx, %rdx
+; CHECK-NEXT:    callq foo1@PLT
+; CHECK-NEXT:    movq 8(%rbx), %rax
+; CHECK-NEXT:    movq (%rax), %rdx
+; CHECK-NEXT:    movl %r13d, %ecx
+; CHECK-NEXT:    negl %ecx
+; CHECK-NEXT:    sbbq %rbp, %rbp
+; CHECK-NEXT:    orq %rdx, %rbp
+; CHECK-NEXT:    cmpl $1, %r13d
+; CHECK-NEXT:    sbbq %rax, %rax
+; CHECK-NEXT:    orq %rdx, %rax
+; CHECK-NEXT:    subq $8, %rsp
+; CHECK-NEXT:    movq %r12, %rdi
+; CHECK-NEXT:    movl %r15d, %esi
+; CHECK-NEXT:    movl %r14d, %edx
+; CHECK-NEXT:    xorl %ecx, %ecx
+; CHECK-NEXT:    xorl %r8d, %r8d
+; CHECK-NEXT:    xorl %r9d, %r9d
+; CHECK-NEXT:    pushq %rax
+; CHECK-NEXT:    pushq %rbp
+; CHECK-NEXT:    pushq %rbx
+; CHECK-NEXT:    callq foo2@PLT
+; CHECK-NEXT:    addq $40, %rsp
+; CHECK-NEXT:    popq %rbx
+; CHECK-NEXT:    popq %r12
+; CHECK-NEXT:    popq %r13
+; CHECK-NEXT:    popq %r14
+; CHECK-NEXT:    popq %r15
+; CHECK-NEXT:    popq %rbp
+; CHECK-NEXT:    retq
+  %6 = getelementptr inbounds %struct.y_s, %struct.y_s* %1, i64 0, i32 0
+  %7 = load i64*, i64** %6, align 8
+  %8 = getelementptr inbounds %struct.y_s, %struct.y_s* %1, i64 0, i32 1
+  %9 = load i64*, i64** %8, align 8
+  tail call void @foo1(i64* noundef %7, i64* noundef %9, %struct.y_s* noundef %1)
+  %10 = icmp eq i32 %4, 0
+  %11 = load i64*, i64** %8, align 8
+  %12 = load i64, i64* %11, align 8
+  %13 = select i1 %10, i64 %12, i64 -1
+  %14 = select i1 %10, i64 -1, i64 %12
+  %15 = tail call noundef i32 @foo2(i32* noundef %0, i32 noundef %2, i32 noundef %3, i32 noundef 0, i32 noundef 0, i32 noundef 0, %struct.y_s* noundef nonnull %1, i64 noundef %13, i64 noundef %14)
+  ret i32 %15
+}
+
+declare void @foo1(i64* noundef, i64* noundef, %struct.y_s* noundef) local_unnamed_addr #1
+declare noundef i32 @foo2(i32* noundef, i32 noundef, i32 noundef, i32 noundef, i32 noundef, i32 noundef, %struct.y_s* noundef, i64 noundef, i64 noundef) local_unnamed_addr #1