mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-09-08 08:54:58 +00:00
ab5c703fdb
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 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@119977 91177308-0d34-0410-b5e6-96231b3b80d8
36 lines
733 B
LLVM
36 lines
733 B
LLVM
; RUN: llc < %s -mtriple=thumb-apple-darwin | FileCheck %s
|
|
|
|
define void @test1() {
|
|
; CHECK: test1:
|
|
; CHECK: sub sp, #256
|
|
; CHECK: add sp, #256
|
|
%tmp = alloca [ 64 x i32 ] , align 4
|
|
ret void
|
|
}
|
|
|
|
define void @test2() {
|
|
; CHECK: test2:
|
|
; CHECK: ldr r0, LCPI
|
|
; CHECK: add sp, r0
|
|
; CHECK: subs r4, r7, #4
|
|
; CHECK: mov sp, r4
|
|
%tmp = alloca [ 4168 x i8 ] , align 4
|
|
ret void
|
|
}
|
|
|
|
define i32 @test3() {
|
|
; CHECK: test3:
|
|
; CHECK: ldr r2, LCPI
|
|
; CHECK: add sp, r2
|
|
; CHECK: ldr r1, LCPI
|
|
; CHECK: add r1, sp
|
|
; CHECK: subs r4, r7, #4
|
|
; CHECK: mov sp, r4
|
|
%retval = alloca i32, align 4
|
|
%tmp = alloca i32, align 4
|
|
%a = alloca [805306369 x i8], align 16
|
|
store i32 0, i32* %tmp
|
|
%tmp1 = load i32* %tmp
|
|
ret i32 %tmp1
|
|
}
|