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7 Commits

Author SHA1 Message Date
Dylan McKay
92f59a0260 [AVR] Implement stacksave/stackrestore by expanding (PR31342) 
Summary:
Authored by Florian Zeitz.

This implements the missing stacksave/stackrestore intrinsics via expansion.

Output of `llc -O0 -march=avr ~/devel/llvm/test/CodeGen/Generic/stacksave-restore.ll` for sanity checking (comments mine):

```
	.text
	.file	".../llvm/test/CodeGen/Generic/stacksave-restore.ll"
	.globl	test
	.p2align	1
	.type	test,@function
test:                                   ; @test
; BB#0:
	push	r28
	push	r29

	in	r28, 61
	in	r29, 62
	sbiw	r28, 4
	in	r0, 63
	cli
	out	62, r29
	out	63, r0
	out	61, r28

	in	r18, 61
	in	r19, 62

	mov	r20, r22
	mov	r21, r23

	in	r30, 61
	in	r31, 62

	lsl	r22
	rol	r23
	lsl	r22
	rol	r23
	in	r26, 61
	in	r27, 62
	sub	r26, r22
	sbc	r27, r23
	andi	r26, 252
	in	r0, 63
	cli
	out	62, r27
	out	63, r0
	out	61, r26

	in	r0, 63
	cli
	out	62, r31
	out	63, r0
	out	61, r30

	in	r30, 61
	in	r31, 62
	sub	r30, r22
	sbc	r31, r23
	andi	r30, 252
	in	r0, 63
	cli
	out	62, r31
	out	63, r0
	out	61, r30

	std	Y+3, r24                ; 2-byte Folded Spill
	std	Y+4, r25                ; 2-byte Folded Spill

	mov	r24, r26
	mov	r25, r27

	in	r0, 63
	cli
	out	62, r19
	out	63, r0
	out	61, r18

	std	Y+1, r20                ; 2-byte Folded Spill
	std	Y+2, r21                ; 2-byte Folded Spill

	adiw	r28, 4
	in	r0, 63
	cli
	out	62, r29
	out	63, r0
	out	61, r28

	pop	r29
	pop	r28
	ret
.Lfunc_end0:
	.size	test, .Lfunc_end0-test
```

Reviewers: dylanmckay

Reviewed By: dylanmckay

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D29553

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@294146 91177308-0d34-0410-b5e6-96231b3b80d8
 2017-02-05 21:35:45 +00:00
Dylan McKay
10348c4bad [AVR] Support zero-sized arguments in defined methods 
It is sufficient to skip emission of these arguments as we have nothing
to actually pass through the function call.

The AVR-GCC reference has nothing to say about zero-sized arguments,
presumably because C/C++ doesn't support them. This means we don't have
to worry about ABI differences.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@294119 91177308-0d34-0410-b5e6-96231b3b80d8
 2017-02-05 09:53:45 +00:00
Dylan McKay
ae27a7ca66 [AVR] Implement TargetLoweing::getRegisterByName 
This allows the use of the 'read_register' intrinsics used by clang's
named register globals features.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@291375 91177308-0d34-0410-b5e6-96231b3b80d8
 2017-01-07 23:39:47 +00:00
Dylan McKay
038449d896 [AVR] Expand 'SELECT_CC' nodes whereever possible 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@288905 91177308-0d34-0410-b5e6-96231b3b80d8
 2016-12-07 12:34:47 +00:00
Dylan McKay
0586c7bf63 [AVR] Add instruction selection lowering code 
Summary: This adds AVRISelLowering.cpp

Reviewers: arsenm, kparzysz

Subscribers: llvm-commits, modocache, japaric, wdng, beanz, mgorny

Differential Revision: https://reviews.llvm.org/D25034

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@285790 91177308-0d34-0410-b5e6-96231b3b80d8
 2016-11-02 06:47:40 +00:00
Dylan McKay
22a65ba593 Revert "[AVR] Add instruction selection lowering code" 
I accidentally comitted it.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@282712 91177308-0d34-0410-b5e6-96231b3b80d8
 2016-09-29 12:49:18 +00:00
Dylan McKay
da4f4c9f4f [AVR] Add instruction selection lowering code 
Summary: This adds AVRISelLowering.cpp

Reviewers: kparzysz, arsenm

Subscribers: wdng, beanz, mgorny

Differential Revision: https://reviews.llvm.org/D25034

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@282711 91177308-0d34-0410-b5e6-96231b3b80d8
 2016-09-29 12:44:38 +00:00