Imported Upstream version 5.18.0.246

Former-commit-id: 0c7ce5b1a7851e13f22acfd379b7f9fb304e4833

external/llvm/test/CodeGen/X86/stack-probe-size.ll

@@ -0,0 +1,77 @@
+; This test is attempting to detect that the compiler correctly generates stack
+; probe calls when the size of the local variables exceeds the specified stack
+; probe size.
+;
+; Testing the default value of 4096 bytes makes sense, because the default
+; stack probe size equals the page size (4096 bytes for all x86 targets), and
+; this is unlikely to change in the future.
+;
+; RUN: llc -mtriple=i686-windows-msvc < %s | FileCheck %s
+
+target datalayout = "e-m:w-p:32:32-i64:64-f80:32-n8:16:32-S32"
+
+define i32 @test1() "stack-probe-size"="0" {
+  %buffer = alloca [4095 x i8]
+
+  ret i32 0
+
+; CHECK-LABEL: _test1:
+; CHECK-NOT: subl $4095, %esp
+; CHECK: movl $4095, %eax
+; CHECK: calll __chkstk
+}
+
+define i32 @test2() {
+  %buffer = alloca [4095 x i8]
+
+  ret i32 0
+
+; CHECK-LABEL: _test2:
+; CHECK-NOT: movl $4095, %eax
+; CHECK: subl $4095, %esp
+; CHECK-NOT: calll __chkstk
+}
+
+define i32 @test3() "stack-probe-size"="8192" {
+  %buffer = alloca [4095 x i8]
+
+  ret i32 0
+
+; CHECK-LABEL: _test3:
+; CHECK-NOT: movl $4095, %eax
+; CHECK: subl $4095, %esp
+; CHECK-NOT: calll __chkstk
+}
+
+define i32 @test4() "stack-probe-size"="0" {
+  %buffer = alloca [4096 x i8]
+
+  ret i32 0
+
+; CHECK-LABEL: _test4:
+; CHECK-NOT: subl $4096, %esp
+; CHECK: movl $4096, %eax
+; CHECK: calll __chkstk
+}
+
+define i32 @test5() {
+  %buffer = alloca [4096 x i8]
+
+  ret i32 0
+
+; CHECK-LABEL: _test5:
+; CHECK-NOT: subl $4096, %esp
+; CHECK: movl $4096, %eax
+; CHECK: calll __chkstk
+}
+
+define i32 @test6() "stack-probe-size"="8192" {
+  %buffer = alloca [4096 x i8]
+
+  ret i32 0
+
+; CGECK-LABEL: _test6:
+; CGECK-NOT: movl $4096, %eax
+; CGECK: subl $4096, %esp
+; CGECK-NOT: calll __chkstk
+}