2010-08-11 03:30:19 +08:00
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; RUN: llc < %s -mtriple=thumb-apple-darwin | FileCheck %s
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2009-06-24 14:36:07 +08:00
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define void @test1() {
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2010-08-11 03:30:19 +08:00
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; CHECK: test1:
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; CHECK: sub sp, #256
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; CHECK: add sp, #256
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2009-06-24 14:36:07 +08:00
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%tmp = alloca [ 64 x i32 ] , align 4
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ret void
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}
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define void @test2() {
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2010-08-11 03:30:19 +08:00
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; CHECK: test2:
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2010-12-16 07:52:36 +08:00
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; CHECK: ldr.n r0, LCPI
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2010-08-11 03:30:19 +08:00
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; CHECK: add sp, r0
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Fix epilogue codegen to avoid leaving the stack pointer in an invalid
state. Previously Thumb2 would restore sp from fp like this:
mov sp, r7
sub, sp, #4
If an interrupt is taken after the 'mov' but before the 'sub', callee-saved
registers might be clobbered by the interrupt handler. Instead, try
restoring directly from sp:
add sp, #4
Or, if necessary (with VLA, etc.) use a scratch register to compute sp and
then restore it:
sub.w r4, r7, #8
mov sp, r7
rdar://8465407
llvm-svn: 119977
2010-11-23 02:12:04 +08:00
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; CHECK: subs r4, r7, #4
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; CHECK: mov sp, r4
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2009-06-24 14:36:07 +08:00
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%tmp = alloca [ 4168 x i8 ] , align 4
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ret void
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}
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define i32 @test3() {
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2010-08-11 03:30:19 +08:00
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; CHECK: test3:
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2010-12-16 07:52:36 +08:00
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; CHECK: ldr.n r2, LCPI
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2010-08-26 08:58:06 +08:00
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; CHECK: add sp, r2
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2010-12-16 07:52:36 +08:00
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; CHECK: ldr.n r1, LCPI
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2010-08-11 03:30:19 +08:00
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; CHECK: add r1, sp
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Fix epilogue codegen to avoid leaving the stack pointer in an invalid
state. Previously Thumb2 would restore sp from fp like this:
mov sp, r7
sub, sp, #4
If an interrupt is taken after the 'mov' but before the 'sub', callee-saved
registers might be clobbered by the interrupt handler. Instead, try
restoring directly from sp:
add sp, #4
Or, if necessary (with VLA, etc.) use a scratch register to compute sp and
then restore it:
sub.w r4, r7, #8
mov sp, r7
rdar://8465407
llvm-svn: 119977
2010-11-23 02:12:04 +08:00
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; CHECK: subs r4, r7, #4
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; CHECK: mov sp, r4
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2010-08-11 03:30:19 +08:00
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%retval = alloca i32, align 4
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%tmp = alloca i32, align 4
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%a = alloca [805306369 x i8], align 16
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store i32 0, i32* %tmp
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%tmp1 = load i32* %tmp
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ret i32 %tmp1
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2009-06-24 14:36:07 +08:00
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}
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