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7255a4e133
Now that canRealignStack() understands frozen reserved registers, it is safe to use it for aligned spill instructions. It will only return true if the registers reserved at the beginning of register allocation allow for dynamic stack realignment. <rdar://problem/10625436> git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147579 91177308-0d34-0410-b5e6-96231b3b80d8
96 lines
3.1 KiB
LLVM
96 lines
3.1 KiB
LLVM
; RUN: llc < %s -mcpu=cortex-a8 | FileCheck %s
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; RUN: llc < %s -mcpu=cortex-a8 -align-neon-spills | FileCheck %s --check-prefix=NEON
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target 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"
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target triple = "thumbv7-apple-ios"
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; CHECK: f
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; This function is forced to spill a double.
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; Verify that the spill slot is properly aligned.
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;
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; The caller-saved r4 is used as a scratch register for stack realignment.
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; CHECK: push {r4, r7, lr}
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; CHECK: bic r4, r4, #7
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; CHECK: mov sp, r4
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define void @f(double* nocapture %p) nounwind ssp {
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entry:
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%0 = load double* %p, align 4
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tail call void asm sideeffect "", "~{d8},~{d9},~{d10},~{d11},~{d12},~{d13},~{d14},~{d15}"() nounwind
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tail call void @g() nounwind
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store double %0, double* %p, align 4
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ret void
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}
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; NEON: f
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; NEON: push {r4, r7, lr}
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; NEON: sub.w r4, sp, #64
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; NEON: bic r4, r4, #15
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; Stack pointer must be updated before the spills.
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; NEON: mov sp, r4
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; NEON: vst1.64 {d8, d9, d10, d11}, [r4, :128]!
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; NEON: vst1.64 {d12, d13, d14, d15}, [r4, :128]
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; Stack pointer adjustment for the stack frame contents.
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; This could legally happen before the spills.
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; Since the spill slot is only 8 bytes, technically it would be fine to only
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; subtract #8 here. That would leave sp less aligned than some stack slots,
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; and would probably blow MFI's mind.
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; NEON: sub sp, #16
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; The epilog is free to use another scratch register than r4.
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; NEON: add r[[R4:[0-9]+]], sp, #16
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; NEON: vld1.64 {d8, d9, d10, d11}, [r[[R4]], :128]!
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; NEON: vld1.64 {d12, d13, d14, d15}, [r[[R4]], :128]
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; The stack pointer restore must happen after the reloads.
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; NEON: mov sp,
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; NEON: pop
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declare void @g()
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; Spill 7 d-registers.
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define void @f7(double* nocapture %p) nounwind ssp {
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entry:
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tail call void asm sideeffect "", "~{d8},~{d9},~{d10},~{d11},~{d12},~{d13},~{d14}"() nounwind
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ret void
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}
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; NEON: f7
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; NEON: push {r4, r7, lr}
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; NEON: sub.w r4, sp, #56
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; NEON: bic r4, r4, #15
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; Stack pointer must be updated before the spills.
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; NEON: mov sp, r4
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; NEON: vst1.64 {d8, d9, d10, d11}, [r4, :128]!
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; NEON: vst1.64 {d12, d13}, [r4, :128]
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; NEON: vstr d14, [r4, #16]
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; Epilog
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; NEON: vld1.64 {d8, d9, d10, d11},
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; NEON: vld1.64 {d12, d13},
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; NEON: vldr d14,
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; The stack pointer restore must happen after the reloads.
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; NEON: mov sp,
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; NEON: pop
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; Spill 7 d-registers, leave a hole.
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define void @f3plus4(double* nocapture %p) nounwind ssp {
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entry:
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tail call void asm sideeffect "", "~{d8},~{d9},~{d10},~{d12},~{d13},~{d14},~{d15}"() nounwind
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ret void
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}
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; Aligned spilling only works for contiguous ranges starting from d8.
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; The rest goes to the standard vpush instructions.
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; NEON: f3plus4
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; NEON: push {r4, r7, lr}
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; NEON: vpush {d12, d13, d14, d15}
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; NEON: sub.w r4, sp, #24
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; NEON: bic r4, r4, #15
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; Stack pointer must be updated before the spills.
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; NEON: mov sp, r4
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; NEON: vst1.64 {d8, d9}, [r4, :128]
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; NEON: vstr d10, [r4, #16]
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; Epilog
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; NEON: vld1.64 {d8, d9},
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; NEON: vldr d10, [{{.*}}, #16]
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; The stack pointer restore must happen after the reloads.
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; NEON: mov sp,
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; NEON: vpop {d12, d13, d14, d15}
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; NEON: pop
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