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[AArch64] Use FP to access the emergency spill slot In the presence of variable-sized stack objects, we always picked the base pointer when resolving frame indices if it was available. This makes us hit an assert where we can't reach the emergency spill slot if it's too far away from the base pointer. Since on AArch64 we decide to place the emergency spill slot at the top of the frame, it makes more sense to use FP to access it. The changes here don't affect only emergency spill slots but all the frame indices. The goal here is to try to choose between FP, BP and SP so that we minimize the offset and avoid scavenging, or worse, asserting when trying to access a slot allocated by the scavenger. Previously discussed here: https://reviews.llvm.org/D40876. Differential Revision: https://reviews.llvm.org/D45358 llvm-svn: 329691
2018-04-10 19:29:40 +08:00
#RUN: llc -mtriple=aarch64-- -run-pass prologepilog %s -o - | FileCheck %s
# Check that we use the frame pointer to address the emergency spill slot.
# Using the base pointer will result in an assert with "Emergency spill slot is
# out of reach".
---
name: hugeStack
# CHECK-LABEL: name: hugeStack
tracksRegLiveness: true
frameInfo:
localFrameSize: 256
stack:
- { id: 0, type: variable-sized, alignment: 1 }
- { id: 1, name: '', size: 32761, alignment: 8 }
body: |
bb.0:
STRXui undef $x8, %stack.0, 0
Relanding r368987 [AArch64] Change location of frame-record within callee-save area. Changes: There was a condition for `!NeedsFrameRecord` missing in the assert. The assert in question has changed to: + assert((!RPI.isPaired() || !NeedsFrameRecord || RPI.Reg2 != AArch64::FP || + RPI.Reg1 == AArch64::LR) && + "FrameRecord must be allocated together with LR"); This addresses PR43016. llvm-svn: 369122
2019-08-16 23:42:28 +08:00
; CHECK: STRXui undef $x8, $fp, 0
[AArch64] Use FP to access the emergency spill slot In the presence of variable-sized stack objects, we always picked the base pointer when resolving frame indices if it was available. This makes us hit an assert where we can't reach the emergency spill slot if it's too far away from the base pointer. Since on AArch64 we decide to place the emergency spill slot at the top of the frame, it makes more sense to use FP to access it. The changes here don't affect only emergency spill slots but all the frame indices. The goal here is to try to choose between FP, BP and SP so that we minimize the offset and avoid scavenging, or worse, asserting when trying to access a slot allocated by the scavenger. Previously discussed here: https://reviews.llvm.org/D40876. Differential Revision: https://reviews.llvm.org/D45358 llvm-svn: 329691
2018-04-10 19:29:40 +08:00
B %bb.1
bb.1:
Relanding r368987 [AArch64] Change location of frame-record within callee-save area. Changes: There was a condition for `!NeedsFrameRecord` missing in the assert. The assert in question has changed to: + assert((!RPI.isPaired() || !NeedsFrameRecord || RPI.Reg2 != AArch64::FP || + RPI.Reg1 == AArch64::LR) && + "FrameRecord must be allocated together with LR"); This addresses PR43016. llvm-svn: 369122
2019-08-16 23:42:28 +08:00
liveins: $x0, $x1, $x2, $x3, $x4, $x5, $x6, $x7, $x8, $x9, $x10, $x11, $x12, $x13, $x14, $x15, $x16, $x17, $x18, $x19, $x20, $x21, $x22, $x23, $x24, $x25, $x26, $x27, $x28
RET_ReallyLR implicit $x19, implicit $x20, implicit $x21, implicit $x22, implicit $x23, implicit $x24, implicit $x25, implicit $x26, implicit $x27, implicit $x28
[AArch64] Add test case for r329797 Forgot to add a test case in the previous commit. llvm-svn: 329805
2018-04-11 21:37:25 +08:00
...
---
name: fpDoesNotFit
# CHECK-LABEL: name: fpDoesNotFit
tracksRegLiveness: true
frameInfo:
hasStackMap: true
# set to true to force hasFP to true.
stack:
- { id: 0, name: '', size: 4096, alignment: 8 }
- { id: 1, name: '', size: 32761, alignment: 8 }
body: |
bb.0:
STRXui undef $x8, %stack.0, -34
; Pick SP here. Picking FP will require scavenging a register.
; CHECK: STRXui undef $x8, $sp, 4062
RET_ReallyLR