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1; RUN: llc < %s -mcpu=cortex-a8 -align-neon-spills=0 | FileCheck %s2; RUN: llc < %s -mcpu=cortex-a8 -align-neon-spills=1 | FileCheck %s --check-prefix=NEON3target datalayout = "e-p:32:32:32-i1:8:32-i8:8:32-i16:16:32-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:32:64-v128:32:128-a0:0:32-n32-S32"4target triple = "thumbv7-apple-ios"5 6; CHECK: f7; This function is forced to spill a double.8; Verify that the spill slot is properly aligned.9;10; The caller-saved r4 is used as a scratch register for stack realignment.11; CHECK: push {r4, r7, lr}12; CHECK: bfc r4, #0, #313; CHECK: mov sp, r414define void @f(ptr nocapture %p) nounwind ssp "frame-pointer"="all" {15entry:16 %0 = load double, ptr %p, align 417 tail call void asm sideeffect "", "~{d8},~{d9},~{d10},~{d11},~{d12},~{d13},~{d14},~{d15}"() nounwind18 tail call void @g() nounwind19 store double %0, ptr %p, align 420 ret void21}22 23; NEON: f24; NEON: push {r4, r7, lr}25; NEON: sub.w r4, sp, #6426; NEON: bfc r4, #0, #427; Stack pointer must be updated before the spills.28; NEON: mov sp, r429; NEON: vst1.64 {d8, d9, d10, d11}, [r4:128]!30; NEON: vst1.64 {d12, d13, d14, d15}, [r4:128]31; Stack pointer adjustment for the stack frame contents.32; This could legally happen before the spills.33; Since the spill slot is only 8 bytes, technically it would be fine to only34; subtract #8 here. That would leave sp less aligned than some stack slots,35; and would probably blow MFI's mind.36; NEON: sub sp, #1637; The epilog is free to use another scratch register than r4.38; NEON: add r[[R4:[0-9]+]], sp, #1639; NEON: vld1.64 {d8, d9, d10, d11}, [r[[R4]]:128]!40; NEON: vld1.64 {d12, d13, d14, d15}, [r[[R4]]:128]41; The stack pointer restore must happen after the reloads.42; NEON: mov sp,43; NEON: pop44 45declare void @g()46 47; Spill 7 d-registers.48define void @f7(ptr nocapture %p) nounwind ssp "frame-pointer"="all" {49entry:50 tail call void asm sideeffect "", "~{d8},~{d9},~{d10},~{d11},~{d12},~{d13},~{d14}"() nounwind51 ret void52}53 54; NEON: f755; NEON: push {r4, r7, lr}56; NEON: sub.w r4, sp, #5657; NEON: bfc r4, #0, #458; Stack pointer must be updated before the spills.59; NEON: mov sp, r460; NEON: vst1.64 {d8, d9, d10, d11}, [r4:128]!61; NEON: vst1.64 {d12, d13}, [r4:128]62; NEON: vstr d14, [r4, #16]63; Epilog64; NEON: vld1.64 {d8, d9, d10, d11},65; NEON: vld1.64 {d12, d13},66; NEON: vldr d14,67; The stack pointer restore must happen after the reloads.68; NEON: mov sp,69; NEON: pop70 71; Spill 7 d-registers, leave a hole.72define void @f3plus4(ptr nocapture %p) nounwind ssp "frame-pointer"="all" {73entry:74 tail call void asm sideeffect "", "~{d8},~{d9},~{d10},~{d12},~{d13},~{d14},~{d15}"() nounwind75 ret void76}77 78; Aligned spilling only works for contiguous ranges starting from d8.79; The rest goes to the standard vpush instructions.80; NEON: f3plus481; NEON: push {r4, r7, lr}82; NEON: vpush {d12, d13, d14, d15}83; NEON: sub.w r4, sp, #2484; NEON: bfc r4, #0, #485; Stack pointer must be updated before the spills.86; NEON: mov sp, r487; NEON: vst1.64 {d8, d9}, [r4:128]88; NEON: vstr d10, [r4, #16]89; Epilog90; NEON: vld1.64 {d8, d9},91; NEON: vldr d10, [{{.*}}, #16]92; The stack pointer restore must happen after the reloads.93; NEON: mov sp,94; NEON: vpop {d12, d13, d14, d15}95; NEON: pop96