| ; 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 |
| } |