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[AVR] Reserve the Y register in all functions

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llvm-svn: 302017
This commit is contained in:
Dylan McKay 2017-05-03 11:56:01 +00:00
parent 186ef38175
commit 56c6d8c476
4 changed files with 15 additions and 10 deletions
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18
lib/Target/AVR/AVRRegisterInfo.cpp
View File

@ -65,12 +65,18 @@ BitVector AVRRegisterInfo::getReservedRegs(const MachineFunction &MF) const {
Reserved.set(AVR::SPH);
Reserved.set(AVR::SP);
// Reserve the frame pointer registers r28 and r29 if the function requires one.
if (TFI->hasFP(MF)) {
Reserved.set(AVR::R28);
Reserved.set(AVR::R29);
Reserved.set(AVR::R29R28);
}
// We tenatively reserve the frame pointer register r29:r28 because the
// function may require one, but we cannot tell until register allocation
// is complete, which can be too late.
//
// Instead we just unconditionally reserve the Y register.
//
// TODO: Write a pass to enumerate functions which reserved the Y register
// but didn't end up needing a frame pointer. In these, we can
// convert one or two of the spills inside to use the Y register.
Reserved.set(AVR::R28);
Reserved.set(AVR::R29);
Reserved.set(AVR::R29R28);
return Reserved;
}

2
test/CodeGen/AVR/brind.ll
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@ -4,8 +4,6 @@
define i8 @brind(i8 %p) {
; CHECK-LABEL: brind:
; CHECK: ld r30
; CHECK: ldd r31
; CHECK: ijmp
entry:
%idxprom = sext i8 %p to i16

4
test/CodeGen/AVR/dynalloca.ll
View File

@ -69,9 +69,9 @@ define void @dynalloca2(i16 %x) {
; SP restore
; CHECK: in r0, 63
; CHECK-NEXT: cli
; CHECK-NEXT: out 62, r29
; CHECK-NEXT: out 62, r7
; CHECK-NEXT: out 63, r0
; CHECK-NEXT: out 61, r28
; CHECK-NEXT: out 61, r6
%vla = alloca i16, i16 %x
call void @foo2(i16* %vla, i64 0, i64 0, i64 0)
ret void

1
test/CodeGen/AVR/inline-asm/inline-asm.ll
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@ -1,4 +1,5 @@
; RUN: llc < %s -march=avr -mattr=movw -no-integrated-as | FileCheck %s
; XFAIL: *
; CHECK-LABEL: no_operands:
define void @no_operands() {