ARM: Add support for segmented stacks

Patch by Alex Crichton, ILyoan, Luqman Aden and Svetoslav.

llvm-svn: 205430

1 files changed, 235 insertions, 0 deletions

diff --git a/llvm/test/CodeGen/ARM/segmented-stacks.ll b/llvm/test/CodeGen/ARM/segmented-stacks.ll
new file mode 100644
index 00000000000..5eff63303bc
--- /dev/null
+++ b/llvm/test/CodeGen/ARM/segmented-stacks.ll
@@ -0,0 +1,235 @@
+; RUN: llc < %s -mtriple=arm-linux-androideabi -segmented-stacks -verify-machineinstrs | FileCheck %s -check-prefix=ARM-android
+; RUN: llc < %s -mtriple=arm-linux-unknown-gnueabi -segmented-stacks -verify-machineinstrs | FileCheck %s -check-prefix=ARM-linux
+
+; We used to crash with filetype=obj
+; RUN: llc < %s -mtriple=arm-linux-androideabi -segmented-stacks -filetype=obj
+; RUN: llc < %s -mtriple=arm-linux-unknown-gnueabi -segmented-stacks -filetype=obj
+
+
+; Just to prevent the alloca from being optimized away
+declare void @dummy_use(i32*, i32)
+
+define void @test_basic() {
+        %mem = alloca i32, i32 10
+        call void @dummy_use (i32* %mem, i32 10)
+	ret void
+
+; ARM-linux:      test_basic:
+
+; ARM-linux:      push    {r4, r5}
+; ARM-linux-NEXT: mrc     p15, #0, r4, c13, c0, #3
+; ARM-linux-NEXT: mov     r5, sp
+; ARM-linux-NEXT: ldr     r4, [r4, #4]
+; ARM-linux-NEXT: cmp     r4, r5
+; ARM-linux-NEXT: blo     .LBB0_2
+
+; ARM-linux:      mov     r4, #48
+; ARM-linux-NEXT: mov     r5, #0
+; ARM-linux-NEXT: stmdb   sp!, {lr}
+; ARM-linux-NEXT: bl      __morestack
+; ARM-linux-NEXT: ldm     sp!, {lr}
+; ARM-linux-NEXT: pop     {r4, r5}
+; ARM-linux-NEXT: bx      lr
+
+; ARM-linux:      pop     {r4, r5}
+
+; ARM-android:      test_basic:
+
+; ARM-android:      push    {r4, r5}
+; ARM-android-NEXT: mrc     p15, #0, r4, c13, c0, #3
+; ARM-android-NEXT: mov     r5, sp
+; ARM-android-NEXT: ldr     r4, [r4, #252]
+; ARM-android-NEXT: cmp     r4, r5
+; ARM-android-NEXT: blo     .LBB0_2
+
+; ARM-android:      mov     r4, #48
+; ARM-android-NEXT: mov     r5, #0
+; ARM-android-NEXT: stmdb   sp!, {lr}
+; ARM-android-NEXT: bl      __morestack
+; ARM-android-NEXT: ldm     sp!, {lr}
+; ARM-android-NEXT: pop     {r4, r5}
+; ARM-android-NEXT: bx      lr
+
+; ARM-android:      pop     {r4, r5}
+
+}
+
+define i32 @test_nested(i32 * nest %closure, i32 %other) {
+       %addend = load i32 * %closure
+       %result = add i32 %other, %addend
+       ret i32 %result
+
+; ARM-linux:      test_nested:
+
+; ARM-linux:      push    {r4, r5}
+; ARM-linux-NEXT: mrc     p15, #0, r4, c13, c0, #3
+; ARM-linux-NEXT: mov     r5, sp
+; ARM-linux-NEXT: ldr     r4, [r4, #4]
+; ARM-linux-NEXT: cmp     r4, r5
+; ARM-linux-NEXT: blo     .LBB1_2
+
+; ARM-linux:      mov     r4, #0
+; ARM-linux-NEXT: mov     r5, #0
+; ARM-linux-NEXT: stmdb   sp!, {lr}
+; ARM-linux-NEXT: bl      __morestack
+; ARM-linux-NEXT: ldm     sp!, {lr}
+; ARM-linux-NEXT: pop     {r4, r5}
+; ARM-linux-NEXT: bx      lr
+
+; ARM-linux:      pop     {r4, r5}
+
+; ARM-android:      test_nested:
+
+; ARM-android:      push    {r4, r5}
+; ARM-android-NEXT: mrc     p15, #0, r4, c13, c0, #3
+; ARM-android-NEXT: mov     r5, sp
+; ARM-android-NEXT: ldr     r4, [r4, #252]
+; ARM-android-NEXT: cmp     r4, r5
+; ARM-android-NEXT: blo     .LBB1_2
+
+; ARM-android:      mov     r4, #0
+; ARM-android-NEXT: mov     r5, #0
+; ARM-android-NEXT: stmdb   sp!, {lr}
+; ARM-android-NEXT: bl      __morestack
+; ARM-android-NEXT: ldm     sp!, {lr}
+; ARM-android-NEXT: pop     {r4, r5}
+; ARM-android-NEXT: bx      lr
+
+; ARM-android:      pop     {r4, r5}
+
+}
+
+define void @test_large() {
+        %mem = alloca i32, i32 10000
+        call void @dummy_use (i32* %mem, i32 0)
+        ret void
+
+; ARM-linux:      test_large:
+
+; ARM-linux:      push    {r4, r5}
+; ARM-linux-NEXT: mrc     p15, #0, r4, c13, c0, #3
+; ARM-linux-NEXT: sub     r5, sp, #40192
+; ARM-linux-NEXT: ldr     r4, [r4, #4]
+; ARM-linux-NEXT: cmp     r4, r5
+; ARM-linux-NEXT: blo     .LBB2_2
+
+; ARM-linux:      mov     r4, #40192
+; ARM-linux-NEXT: mov     r5, #0
+; ARM-linux-NEXT: stmdb   sp!, {lr}
+; ARM-linux-NEXT: bl      __morestack
+; ARM-linux-NEXT: ldm     sp!, {lr}
+; ARM-linux-NEXT: pop     {r4, r5}
+; ARM-linux-NEXT: bx      lr
+
+; ARM-linux:      pop     {r4, r5}
+
+; ARM-android:      test_large:
+
+; ARM-android:      push    {r4, r5}
+; ARM-android-NEXT: mrc     p15, #0, r4, c13, c0, #3
+; ARM-android-NEXT: sub     r5, sp, #40192
+; ARM-android-NEXT: ldr     r4, [r4, #252]
+; ARM-android-NEXT: cmp     r4, r5
+; ARM-android-NEXT: blo     .LBB2_2
+
+; ARM-android:      mov     r4, #40192
+; ARM-android-NEXT: mov     r5, #0
+; ARM-android-NEXT: stmdb   sp!, {lr}
+; ARM-android-NEXT: bl      __morestack
+; ARM-android-NEXT: ldm     sp!, {lr}
+; ARM-android-NEXT: pop     {r4, r5}
+; ARM-android-NEXT: bx      lr
+
+; ARM-android:      pop     {r4, r5}
+
+}
+
+define fastcc void @test_fastcc() {
+        %mem = alloca i32, i32 10
+        call void @dummy_use (i32* %mem, i32 10)
+        ret void
+
+; ARM-linux:      test_fastcc:
+
+; ARM-linux:      push    {r4, r5}
+; ARM-linux-NEXT: mrc     p15, #0, r4, c13, c0, #3
+; ARM-linux-NEXT: mov     r5, sp
+; ARM-linux-NEXT: ldr     r4, [r4, #4]
+; ARM-linux-NEXT: cmp     r4, r5
+; ARM-linux-NEXT: blo     .LBB3_2
+
+; ARM-linux:      mov     r4, #48
+; ARM-linux-NEXT: mov     r5, #0
+; ARM-linux-NEXT: stmdb   sp!, {lr}
+; ARM-linux-NEXT: bl      __morestack
+; ARM-linux-NEXT: ldm     sp!, {lr}
+; ARM-linux-NEXT: pop     {r4, r5}
+; ARM-linux-NEXT: bx      lr
+
+; ARM-linux:      pop     {r4, r5}
+
+; ARM-android:      test_fastcc:
+
+; ARM-android:      push    {r4, r5}
+; ARM-android-NEXT: mrc     p15, #0, r4, c13, c0, #3
+; ARM-android-NEXT: mov     r5, sp
+; ARM-android-NEXT: ldr     r4, [r4, #252]
+; ARM-android-NEXT: cmp     r4, r5
+; ARM-android-NEXT: blo     .LBB3_2
+
+; ARM-android:      mov     r4, #48
+; ARM-android-NEXT: mov     r5, #0
+; ARM-android-NEXT: stmdb   sp!, {lr}
+; ARM-android-NEXT: bl      __morestack
+; ARM-android-NEXT: ldm     sp!, {lr}
+; ARM-android-NEXT: pop     {r4, r5}
+; ARM-android-NEXT: bx      lr
+
+; ARM-android:      pop     {r4, r5}
+
+}
+
+define fastcc void @test_fastcc_large() {
+        %mem = alloca i32, i32 10000
+        call void @dummy_use (i32* %mem, i32 0)
+        ret void
+
+; ARM-linux:      test_fastcc_large:
+
+; ARM-linux:      push    {r4, r5}
+; ARM-linux-NEXT: mrc     p15, #0, r4, c13, c0, #3
+; ARM-linux-NEXT: sub     r5, sp, #40192
+; ARM-linux-NEXT: ldr     r4, [r4, #4]
+; ARM-linux-NEXT: cmp     r4, r5
+; ARM-linux-NEXT: blo     .LBB4_2
+
+; ARM-linux:      mov     r4, #40192
+; ARM-linux-NEXT: mov     r5, #0
+; ARM-linux-NEXT: stmdb   sp!, {lr}
+; ARM-linux-NEXT: bl      __morestack
+; ARM-linux-NEXT: ldm     sp!, {lr}
+; ARM-linux-NEXT: pop     {r4, r5}
+; ARM-linux-NEXT: bx      lr
+
+; ARM-linux:      pop     {r4, r5}
+
+; ARM-android:      test_fastcc_large:
+
+; ARM-android:      push    {r4, r5}
+; ARM-android-NEXT: mrc     p15, #0, r4, c13, c0, #3
+; ARM-android-NEXT: sub     r5, sp, #40192
+; ARM-android-NEXT: ldr     r4, [r4, #252]
+; ARM-android-NEXT: cmp     r4, r5
+; ARM-android-NEXT: blo     .LBB4_2
+
+; ARM-android:      mov     r4, #40192
+; ARM-android-NEXT: mov     r5, #0
+; ARM-android-NEXT: stmdb   sp!, {lr}
+; ARM-android-NEXT: bl      __morestack
+; ARM-android-NEXT: ldm     sp!, {lr}
+; ARM-android-NEXT: pop     {r4, r5}
+; ARM-android-NEXT: bx      lr
+
+; ARM-android:      pop     {r4, r5}
+
+}