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llvm-mirror/test/MC/PowerPC/ppc64-reloc-directive-pcrel.s

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[PowerPC] Extend .reloc directive on PowerPC When the compiler generates a GOT indirect load it must generate two loads. One that loads the address of the element from the GOT and a second to load the actual element based on the address just loaded from the GOT. However, the linker can optimize these two loads into one load if it knows that it is safe to do so. The compiler can tell the linker that the optimization is safe by using the R_PPC64_PCREL_OPT relocation. This patch extends the .reloc directive to allow the following setup pld 3, vec@got@pcrel(0), 1 .Lpcrel1=.-8 ... More instructions possible here ... .reloc .Lpcrel1,R_PPC64_PCREL_OPT,.-.Lpcrel1 lwa 3, 4(3) Reviewers: nemanjai, lei, hfinkel, sfertile, efriedma, tstellar, grosbach, MaskRay Reviewed By: nemanjai, MaskRay Differential Revision: https://reviews.llvm.org/D79625
2020-07-21 19:54:48 +02:00
# RUN: llvm-mc -triple=powerpc64le -filetype=obj %s | \
# RUN: llvm-objdump -dr --mcpu=pwr10 - | FileCheck %s
# RUN: llvm-mc -triple=powerpc64 -filetype=obj %s | \
# RUN: llvm-objdump -dr --mcpu=pwr10 - | FileCheck %s
##
# This section of tests contains the MCBinaryExpr as the first parameter of the
# .reloc relocation.
##
.text
.abiversion 2
.globl Minimal
.p2align 4
.type Minimal,@function
Minimal:
.LMinimal$local:
pld 3, vec@got@pcrel(0), 1
.Lpcrel1:
.reloc .Lpcrel1-8,R_PPC64_PCREL_OPT,.-(.Lpcrel1-8)
lwa 3, 4(3)
blr
.long 0
.quad 0
# CHECK-LABEL: Minimal
# CHECK: pld 3, 0(0), 1
# CHECK-NEXT: R_PPC64_GOT_PCREL34 vec
# CHECK-NEXT: R_PPC64_PCREL_OPT *ABS*+0x8
# CHECK-NEXT: lwa 3, 4(3)
# CHECK-NEXT: blr
.globl SingleInsnBetween
.p2align 4
.type SingleInsnBetween,@function
SingleInsnBetween:
.LSingleInsnBetween$local:
pld 3, vec@got@pcrel(0), 1
.Lpcrel2:
addi 3, 3, 42
.reloc .Lpcrel2-8,R_PPC64_PCREL_OPT,.-(.Lpcrel2-8)
lwa 3, 4(3)
blr
.long 0
.quad 0
# CHECK_LABEL: SingleInsnBetween
# CHECK: pld 3, 0(0), 1
# CHECK-NEXT: R_PPC64_GOT_PCREL34 vec
# CHECK-NEXT: R_PPC64_PCREL_OPT *ABS*+0xc
# CHECK-NEXT: addi 3, 3, 42
# CHECK-NEXT: lwa 3, 4(3)
# CHECK-NEXT: blr
.globl MultiInsnBetween # -- Begin function
.p2align 4
.type MultiInsnBetween,@function
MultiInsnBetween:
.LMultiInsnBetween$local:
pld 3, vec@got@pcrel(0), 1
.Lpcrel3:
addi 3, 3, 42
addi 3, 3, 42
addi 3, 3, 42
addi 3, 3, 42
addi 3, 3, 42
.reloc .Lpcrel3-8,R_PPC64_PCREL_OPT,.-(.Lpcrel3-8)
lwa 3, 4(3)
blr
.long 0
.quad 0
# CHECK_LABEL: MultiInsnBetween
# CHECK: pld 3, 0(0), 1
# CHECK-NEXT: R_PPC64_GOT_PCREL34 vec
# CHECK-NEXT: R_PPC64_PCREL_OPT *ABS*+0x1c
# CHECK-NEXT: addi 3, 3, 42
# CHECK-NEXT: addi 3, 3, 42
# CHECK-NEXT: addi 3, 3, 42
# CHECK-NEXT: addi 3, 3, 42
# CHECK-NEXT: addi 3, 3, 42
# CHECK-NEXT: lwa 3, 4(3)
# CHECK-NEXT: blr
.globl PrefixInsnBetween
.p2align 6
.type PrefixInsnBetween,@function
.space 48 # Add a space to force an alignment of a paddi.
PrefixInsnBetween:
.LPrefixInsnBetween$local:
pld 3, vec@got@pcrel(0), 1
.Lpcrel4:
addi 3, 3, 42
paddi 3, 3, 42, 0
addi 3, 3, 42
paddi 3, 3, 42, 0
addi 3, 3, 42
.reloc .Lpcrel4-8,R_PPC64_PCREL_OPT,.-(.Lpcrel4-8)
lwa 3, 4(3)
blr
.long 0
.quad 0
# CHECK_LABEL: PrefixInsnBetween
# CHECK: pld 3, 0(0), 1
# CHECK-NEXT: R_PPC64_GOT_PCREL34 vec
# CHECK-NEXT: R_PPC64_PCREL_OPT *ABS*+0x28
# CHECK-NEXT: addi 3, 3, 42
# CHECK-NEXT: nop
# CHECK-NEXT: paddi 3, 3, 42, 0
# CHECK-NEXT: addi 3, 3, 42
# CHECK-NEXT: paddi 3, 3, 42, 0
# CHECK-NEXT: addi 3, 3, 42
# CHECK-NEXT: lwa 3, 4(3)
# CHECK-NEXT: blr
.globl SpaceBetween # -- Begin function
.p2align 4
.type SpaceBetween,@function
SpaceBetween:
.LSpaceBetween$local:
pld 3, vec@got@pcrel(0), 1
.Lpcrel5:
addi 3, 3, 42
paddi 3, 3, 42, 0
addi 3, 3, 42
.space 40, 0
paddi 3, 3, 42, 0
addi 3, 3, 42
.reloc .Lpcrel5-8,R_PPC64_PCREL_OPT,.-(.Lpcrel5-8)
lwa 3, 4(3)
blr
.long 0
.quad 0
# CHECK_LABEL: SpaceBetween
# CHECK: pld 3, 0(0), 1
# CHECK-NEXT: R_PPC64_GOT_PCREL34 vec
# CHECK-NEXT: R_PPC64_PCREL_OPT *ABS*+0x50
# CHECK-NEXT: addi 3, 3, 42
# CHECK-NEXT: nop
# CHECK-NEXT: paddi 3, 3, 42, 0
# CHECK-NEXT: addi 3, 3, 42
# CHECK: paddi 3, 3, 42, 0
# CHECK-NEXT: addi 3, 3, 42
# CHECK-NEXT: lwa 3, 4(3)
# CHECK-NEXT: blr
.globl Plus
.p2align 4
.type Plus,@function
Plus:
.LPlus$local:
.Lpcrel6:
addi 3, 3, 42
addi 3, 3, 42
pld 3, vec@got@pcrel(0), 1
.reloc .Lpcrel6+8,R_PPC64_PCREL_OPT,.-(.Lpcrel6+8)
lwa 3, 4(3)
blr
.long 0
.quad 0
# CHECK-LABEL: Plus
# CHECK: pld 3, 0(0), 1
# CHECK-NEXT: R_PPC64_PCREL_OPT *ABS*+0x8
# CHECK-NEXT: R_PPC64_GOT_PCREL34 vec
# CHECK-NEXT: lwa 3, 4(3)
# CHECK-NEXT: blr
##
# This section of tests contains the variable MCSymbol as part of the
# MCSymbolRefExpr for the first parameter of the .reloc relocation.
##
.globl VarLabelMinimal # -- Begin function
.p2align 4
.type VarLabelMinimal,@function
VarLabelMinimal:
.LVarLabelMinimal$local:
pld 3, vec@got@pcrel(0), 1
.Lpcrel101=.-8
.reloc .Lpcrel101,R_PPC64_PCREL_OPT,.-.Lpcrel101
lwa 3, 4(3)
blr
.long 0
.quad 0
# CHECK-LABEL: VarLabelMinimal
# CHECK: pld 3, 0(0), 1
# CHECK-NEXT: R_PPC64_GOT_PCREL34 vec
# CHECK-NEXT: R_PPC64_PCREL_OPT *ABS*+0x8
# CHECK-NEXT: lwa 3, 4(3)
# CHECK-NEXT: blr
.globl VarLabelSingleInsnBetween
.p2align 4
.type VarLabelSingleInsnBetween,@function
VarLabelSingleInsnBetween:
.LVarLabelSingleInsnBetween$local:
pld 3, vec@got@pcrel(0), 1
.Lpcrel102=.-8
addi 3, 3, 42
.reloc .Lpcrel102,R_PPC64_PCREL_OPT,.-.Lpcrel102
lwa 3, 4(3)
blr
.long 0
.quad 0
# CHECK_LABEL: VarLabelSingleInsnBetween
# CHECK: pld 3, 0(0), 1
# CHECK-NEXT: R_PPC64_GOT_PCREL34 vec
# CHECK-NEXT: R_PPC64_PCREL_OPT *ABS*+0xc
# CHECK-NEXT: addi 3, 3, 42
# CHECK-NEXT: lwa 3, 4(3)
# CHECK-NEXT: blr
.globl VarLabelMultiInsnBetween # -- Begin function
.p2align 4
.type VarLabelMultiInsnBetween,@function
VarLabelMultiInsnBetween:
.LVarLabelMultiInsnBetween$local:
pld 3, vec@got@pcrel(0), 1
.Lpcrel103=.-8
addi 3, 3, 42
addi 3, 3, 42
addi 3, 3, 42
addi 3, 3, 42
addi 3, 3, 42
.reloc .Lpcrel103,R_PPC64_PCREL_OPT,.-.Lpcrel103
lwa 3, 4(3)
blr
.long 0
.quad 0
# CHECK_LABEL: VarLabelMultiInsnBetween
# CHECK: pld 3, 0(0), 1
# CHECK-NEXT: R_PPC64_GOT_PCREL34 vec
# CHECK-NEXT: R_PPC64_PCREL_OPT *ABS*+0x1c
# CHECK-NEXT: addi 3, 3, 42
# CHECK-NEXT: addi 3, 3, 42
# CHECK-NEXT: addi 3, 3, 42
# CHECK-NEXT: addi 3, 3, 42
# CHECK-NEXT: addi 3, 3, 42
# CHECK-NEXT: lwa 3, 4(3)
# CHECK-NEXT: blr
.globl VarLabelPrefixInsnBetween # -- Begin function
.p2align 4
.type VarLabelPrefixInsnBetween,@function
VarLabelPrefixInsnBetween:
.LVarLabelPrefixInsnBetween$local:
pld 3, vec@got@pcrel(0), 1
.Lpcrel104=.-8
addi 3, 3, 42
paddi 3, 3, 42, 0
addi 3, 3, 42
paddi 3, 3, 42, 0
addi 3, 3, 42
.reloc .Lpcrel104,R_PPC64_PCREL_OPT,.-.Lpcrel104
lwa 3, 4(3)
blr
.long 0
.quad 0
# CHECK_LABEL: VarLabelPrefixInsnBetween
# CHECK: pld 3, 0(0), 1
# CHECK-NEXT: R_PPC64_GOT_PCREL34 vec
# CHECK-NEXT: R_PPC64_PCREL_OPT *ABS*+0x24
# CHECK-NEXT: addi 3, 3, 42
# CHECK-NEXT: paddi 3, 3, 42, 0
# CHECK-NEXT: addi 3, 3, 42
# CHECK-NEXT: paddi 3, 3, 42, 0
# CHECK-NEXT: addi 3, 3, 42
# CHECK-NEXT: lwa 3, 4(3)
# CHECK-NEXT: blr
.globl VarLabelSpaceBetween # -- Begin function
.p2align 4
.type VarLabelSpaceBetween,@function
VarLabelSpaceBetween:
.LVarLabelSpaceBetween$local:
pld 3, vec@got@pcrel(0), 1
.Lpcrel105=.-8
addi 3, 3, 42
paddi 3, 3, 42, 0
addi 3, 3, 42
.space 40, 0
paddi 3, 3, 42, 0
addi 3, 3, 42
.reloc .Lpcrel105,R_PPC64_PCREL_OPT,.-.Lpcrel105
lwa 3, 4(3)
blr
.long 0
.quad 0
# CHECK_LABEL: VarLabelSpaceBetween
# CHECK: pld 3, 0(0), 1
# CHECK-NEXT: R_PPC64_GOT_PCREL34 vec
# CHECK-NEXT: R_PPC64_PCREL_OPT *ABS*+0x4c
# CHECK-NEXT: addi 3, 3, 42
# CHECK-NEXT: paddi 3, 3, 42, 0
# CHECK-NEXT: addi 3, 3, 42
# CHECK: paddi 3, 3, 42, 0
# CHECK-NEXT: addi 3, 3, 42
# CHECK-NEXT: lwa 3, 4(3)
# CHECK-NEXT: blr
.globl VarLabelPlus
.p2align 4
.type VarLabelPlus,@function
VarLabelPlus:
.LVarLabelPlus$local:
.Lpcrel106:
addi 3, 3, 42
addi 3, 3, 42
pld 3, vec@got@pcrel(0), 1
.reloc .Lpcrel106+8,R_PPC64_PCREL_OPT,.-(.Lpcrel106+8)
lwa 3, 4(3)
blr
.long 0
.quad 0
# CHECK-LABEL: VarLabelPlus
# CHECK: pld 3, 0(0), 1
# CHECK-NEXT: R_PPC64_PCREL_OPT *ABS*+0x8
# CHECK-NEXT: R_PPC64_GOT_PCREL34 vec
# CHECK-NEXT: lwa 3, 4(3)
# CHECK-NEXT: blr
# Check the situation where the PLD requires an alignment nop.
.globl AlignPLD
.p2align 6
.type AlignPLD,@function
.space 60 # Force the pld to require an alignment nop.
AlignPLD:
.LAlignPLD$local:
pld 3, vec@got@pcrel(0), 1
.Lpcrel201:
.reloc .Lpcrel201-8,R_PPC64_PCREL_OPT,.-(.Lpcrel201-8)
lwa 3, 4(3)
blr
# CHECK-LABEL: AlignPLD
# CHECK: nop
# CHECK-NEXT: pld 3, 0(0), 1
# CHECK-NEXT: R_PPC64_GOT_PCREL34 vec
# CHECK-NEXT: R_PPC64_PCREL_OPT *ABS*+0x8
# CHECK-NEXT: lwa 3, 4(3)
# CHECK-NEXT: blr
# The label and the pld are on the same line and so the nop is inserted before
# the label and the relocation should work.
.globl AlignPLDSameLine
.p2align 6
.type AlignPLDSameLine,@function
.space 60 # Force the pld to require an alignment nop.
AlignPLDSameLine:
.LAlignPLDSameLine$local:
.Lpcrel202: pld 3, vec@got@pcrel(0), 1
.reloc .Lpcrel202,R_PPC64_PCREL_OPT,.-.Lpcrel202
lwa 3, 4(3)
blr
# CHECK-LABEL: AlignPLDSameLine
# CHECK: nop
# CHECK-NEXT: pld 3, 0(0), 1
# CHECK-NEXT: R_PPC64_GOT_PCREL34 vec
# CHECK-NEXT: R_PPC64_PCREL_OPT *ABS*+0x8
# CHECK-NEXT: lwa 3, 4(3)
# CHECK-NEXT: blr
.globl AlignPLDLabelBefore
.p2align 6
.type AlignPLDLabelBefore,@function
.space 60 # Force the pld to require an alignment nop.
AlignPLDLabelBefore:
.LAlignPLDLabelBefore$local:
.Label:
pld 3, vec@got@pcrel(0), 1
.Lpcrel203:
.reloc .Lpcrel203-8,R_PPC64_PCREL_OPT,.-(.Lpcrel203-8)
lwa 3, 4(3)
blr
# CHECK-LABEL: AlignPLDLabelBefore
# CHECK: nop
# CHECK-NEXT: pld 3, 0(0), 1
# CHECK-NEXT: R_PPC64_GOT_PCREL34 vec
# CHECK-NEXT: R_PPC64_PCREL_OPT *ABS*+0x8
# CHECK-NEXT: lwa 3, 4(3)
# CHECK-NEXT: blr
.globl AlignPLDLabelSameLine
.p2align 6
.type AlignPLDLabelSameLine,@function
.space 60 # Force the pld to require an alignment nop.
AlignPLDLabelSameLine:
.Label2: pld 3, vec@got@pcrel(0), 1
.Lpcrel204:
.reloc .Lpcrel204-8,R_PPC64_PCREL_OPT,.-(.Lpcrel204-8)
lwa 3, 4(3)
blr
# CHECK-LABEL: AlignPLDLabelSameLine
# CHECK: nop
# CHECK-NEXT: pld 3, 0(0), 1
# CHECK-NEXT: R_PPC64_GOT_PCREL34 vec
# CHECK-NEXT: R_PPC64_PCREL_OPT *ABS*+0x8
# CHECK-NEXT: lwa 3, 4(3)
# CHECK-NEXT: blr
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