[llvm] [MIR] Allow overriding isSSA, noPhis, noVRegs in MIR input (PR #108546)
Dominik Montada via llvm-commits
llvm-commits at lists.llvm.org
Thu Sep 19 04:31:39 PDT 2024
https://github.com/gargaroff updated https://github.com/llvm/llvm-project/pull/108546
>From 56a5c9f3a54da8e4c46551515a0be652f3b650f3 Mon Sep 17 00:00:00 2001
From: Dominik Montada <dominik.montada at arm.com>
Date: Fri, 13 Sep 2024 13:45:25 +0200
Subject: [PATCH 1/3] [MIR] Allow overriding isSSA, noPhis, noVRegs in MIR
input
Allow setting the computed properties IsSSA, NoPHIs, NoVRegs for MIR
functions in MIR input. The default value is still the computed value.
If the property is set to false, the computed result is ignored. This
allows for tests where a pass is for example inserting PHI nodes into a
function that didn't have any previously.
Closes #37787
---
llvm/include/llvm/CodeGen/MIRYamlMapping.h | 11 +++++
llvm/lib/CodeGen/MIRParser/MIRParser.cpp | 19 ++++++---
llvm/lib/CodeGen/MIRPrinter.cpp | 7 ++++
.../AArch64/mlicm-stack-write-check.mir | 4 +-
.../AMDGPU/early-tailduplicator-nophis.mir | 4 +-
.../Hexagon/expand-condsets-impuse2.mir | 2 +-
.../Hexagon/expand-condsets-phys-reg.mir | 2 +-
.../Hexagon/expand-condsets-rm-reg.mir | 2 +-
...unction-optionally-computed-properties.mir | 42 +++++++++++++++++++
.../X86/sjlj-shadow-stack-liveness.mir | 3 +-
.../llvm-reduce/mir/preserve-func-info.mir | 6 +++
11 files changed, 88 insertions(+), 14 deletions(-)
create mode 100644 llvm/test/CodeGen/MIR/Generic/machine-function-optionally-computed-properties.mir
diff --git a/llvm/include/llvm/CodeGen/MIRYamlMapping.h b/llvm/include/llvm/CodeGen/MIRYamlMapping.h
index 304db57eca4994..e90c22284dcceb 100644
--- a/llvm/include/llvm/CodeGen/MIRYamlMapping.h
+++ b/llvm/include/llvm/CodeGen/MIRYamlMapping.h
@@ -730,6 +730,11 @@ struct MachineFunction {
bool TracksRegLiveness = false;
bool HasWinCFI = false;
+ // Computed properties that should be overridable
+ bool NoPHIs = false;
+ bool IsSSA = false;
+ bool NoVRegs = false;
+
bool CallsEHReturn = false;
bool CallsUnwindInit = false;
bool HasEHCatchret = false;
@@ -770,6 +775,12 @@ template <> struct MappingTraits<MachineFunction> {
YamlIO.mapOptional("tracksRegLiveness", MF.TracksRegLiveness, false);
YamlIO.mapOptional("hasWinCFI", MF.HasWinCFI, false);
+ // PHIs must be not be capitalized, since it will clash with the MIR opcode
+ // leading to false-positive FileCheck hits with CHECK-NOT
+ YamlIO.mapOptional("noPhis", MF.NoPHIs, true);
+ YamlIO.mapOptional("isSSA", MF.IsSSA, true);
+ YamlIO.mapOptional("noVRegs", MF.NoVRegs, true);
+
YamlIO.mapOptional("callsEHReturn", MF.CallsEHReturn, false);
YamlIO.mapOptional("callsUnwindInit", MF.CallsUnwindInit, false);
YamlIO.mapOptional("hasEHCatchret", MF.HasEHCatchret, false);
diff --git a/llvm/lib/CodeGen/MIRParser/MIRParser.cpp b/llvm/lib/CodeGen/MIRParser/MIRParser.cpp
index a5d6a40392d0cb..7d0876a33b70d4 100644
--- a/llvm/lib/CodeGen/MIRParser/MIRParser.cpp
+++ b/llvm/lib/CodeGen/MIRParser/MIRParser.cpp
@@ -178,7 +178,8 @@ class MIRParserImpl {
SMDiagnostic diagFromBlockStringDiag(const SMDiagnostic &Error,
SMRange SourceRange);
- void computeFunctionProperties(MachineFunction &MF);
+ void computeFunctionProperties(MachineFunction &MF,
+ const yaml::MachineFunction &YamlMF);
void setupDebugValueTracking(MachineFunction &MF,
PerFunctionMIParsingState &PFS, const yaml::MachineFunction &YamlMF);
@@ -373,7 +374,8 @@ static bool isSSA(const MachineFunction &MF) {
return true;
}
-void MIRParserImpl::computeFunctionProperties(MachineFunction &MF) {
+void MIRParserImpl::computeFunctionProperties(
+ MachineFunction &MF, const yaml::MachineFunction &YamlMF) {
MachineFunctionProperties &Properties = MF.getProperties();
bool HasPHI = false;
@@ -398,20 +400,25 @@ void MIRParserImpl::computeFunctionProperties(MachineFunction &MF) {
}
}
}
- if (!HasPHI)
+
+ // Don't overwrite NoPHIs if the input MIR explicitly set it to false
+ if (YamlMF.NoPHIs && !HasPHI)
Properties.set(MachineFunctionProperties::Property::NoPHIs);
+
MF.setHasInlineAsm(HasInlineAsm);
if (HasTiedOps && AllTiedOpsRewritten)
Properties.set(MachineFunctionProperties::Property::TiedOpsRewritten);
- if (isSSA(MF))
+ // Don't overwrite IsSSA if the input MIR explicitly set it to false
+ if (YamlMF.IsSSA && isSSA(MF))
Properties.set(MachineFunctionProperties::Property::IsSSA);
else
Properties.reset(MachineFunctionProperties::Property::IsSSA);
+ // Don't overwrite NoVRegs if the input MIR explicitly set it to false
const MachineRegisterInfo &MRI = MF.getRegInfo();
- if (MRI.getNumVirtRegs() == 0)
+ if (YamlMF.NoVRegs && MRI.getNumVirtRegs() == 0)
Properties.set(MachineFunctionProperties::Property::NoVRegs);
}
@@ -595,7 +602,7 @@ MIRParserImpl::initializeMachineFunction(const yaml::MachineFunction &YamlMF,
MachineRegisterInfo &MRI = MF.getRegInfo();
MRI.freezeReservedRegs();
- computeFunctionProperties(MF);
+ computeFunctionProperties(MF, YamlMF);
if (initializeCallSiteInfo(PFS, YamlMF))
return false;
diff --git a/llvm/lib/CodeGen/MIRPrinter.cpp b/llvm/lib/CodeGen/MIRPrinter.cpp
index 6e23969cd99bac..eb5259fd4b77ba 100644
--- a/llvm/lib/CodeGen/MIRPrinter.cpp
+++ b/llvm/lib/CodeGen/MIRPrinter.cpp
@@ -223,6 +223,13 @@ void MIRPrinter::print(const MachineFunction &MF) {
YamlMF.TracksDebugUserValues = MF.getProperties().hasProperty(
MachineFunctionProperties::Property::TracksDebugUserValues);
+ YamlMF.NoPHIs = MF.getProperties().hasProperty(
+ MachineFunctionProperties::Property::NoPHIs);
+ YamlMF.IsSSA = MF.getProperties().hasProperty(
+ MachineFunctionProperties::Property::IsSSA);
+ YamlMF.NoVRegs = MF.getProperties().hasProperty(
+ MachineFunctionProperties::Property::NoVRegs);
+
convert(YamlMF, MF.getRegInfo(), MF.getSubtarget().getRegisterInfo());
MachineModuleSlotTracker MST(MMI, &MF);
MST.incorporateFunction(MF.getFunction());
diff --git a/llvm/test/CodeGen/AArch64/mlicm-stack-write-check.mir b/llvm/test/CodeGen/AArch64/mlicm-stack-write-check.mir
index 0b1fdf9c33d66c..b196d13deb74ac 100644
--- a/llvm/test/CodeGen/AArch64/mlicm-stack-write-check.mir
+++ b/llvm/test/CodeGen/AArch64/mlicm-stack-write-check.mir
@@ -2,6 +2,7 @@
---
name: test
tracksRegLiveness: true
+isSSA: false
registers:
- { id: 0, class: gpr64 }
stack:
@@ -29,11 +30,11 @@ body: |
bb.2:
liveins: $x0
%0 = COPY $x0
- %0 = COPY $x0 ; Force isSSA = false.
...
---
name: test2
tracksRegLiveness: true
+isSSA: false
registers:
- { id: 0, class: gpr64 }
stack:
@@ -61,5 +62,4 @@ body: |
bb.2:
liveins: $x0
%0 = COPY $x0
- %0 = COPY $x0 ; Force isSSA = false.
...
diff --git a/llvm/test/CodeGen/AMDGPU/early-tailduplicator-nophis.mir b/llvm/test/CodeGen/AMDGPU/early-tailduplicator-nophis.mir
index 2cb84c7ef4637d..9fcbdac0ff9d1f 100644
--- a/llvm/test/CodeGen/AMDGPU/early-tailduplicator-nophis.mir
+++ b/llvm/test/CodeGen/AMDGPU/early-tailduplicator-nophis.mir
@@ -2,11 +2,13 @@
# RUN: llc -mtriple=amdgcn-amd-amdhsa -mcpu=gfx900 -run-pass=early-tailduplication -verify-machineinstrs -o - %s | FileCheck %s
# There are no phis in this testcase. Early tail duplication introduces them,
- # so the NoPHIs property needs to be cleared to avoid verifier errors
+ # so the NoPHIs property needs to be set explicitly to false to avoid verifier
+ # errors
---
name: tail_duplicate_nophis
tracksRegLiveness: true
+noPhis: false
body: |
; CHECK-LABEL: name: tail_duplicate_nophis
; CHECK: bb.0:
diff --git a/llvm/test/CodeGen/Hexagon/expand-condsets-impuse2.mir b/llvm/test/CodeGen/Hexagon/expand-condsets-impuse2.mir
index ae3f4ba78cd1ff..ebb361ab433cb7 100644
--- a/llvm/test/CodeGen/Hexagon/expand-condsets-impuse2.mir
+++ b/llvm/test/CodeGen/Hexagon/expand-condsets-impuse2.mir
@@ -6,12 +6,12 @@
name: f0
tracksRegLiveness: true
+isSSA: false
body: |
bb.0:
successors: %bb.1
liveins: $r0, $r1
%0:intregs = COPY $r0
- %0:intregs = COPY $r0 ; defeat IsSSA detection
%1:intregs = COPY $r1
%2:intregs = COPY $r0
%3:intregs = M2_mpyi %2, %1
diff --git a/llvm/test/CodeGen/Hexagon/expand-condsets-phys-reg.mir b/llvm/test/CodeGen/Hexagon/expand-condsets-phys-reg.mir
index e62cd1cc73609b..d252ec5fee4019 100644
--- a/llvm/test/CodeGen/Hexagon/expand-condsets-phys-reg.mir
+++ b/llvm/test/CodeGen/Hexagon/expand-condsets-phys-reg.mir
@@ -9,12 +9,12 @@
name: fred
tracksRegLiveness: true
+isSSA: false
body: |
bb.0:
successors: %bb.1, %bb.2
liveins: $r0
- %0:intregs = A2_tfrsi 0 ;; Multiple defs to ensure IsSSA = false
%0:intregs = L2_loadri_io $r0, 0
%1:predregs = C2_cmpgti %0, 10
%2:intregs = C2_mux %1, $r31, %0
diff --git a/llvm/test/CodeGen/Hexagon/expand-condsets-rm-reg.mir b/llvm/test/CodeGen/Hexagon/expand-condsets-rm-reg.mir
index 6d7b6cd72a3099..463aa9a8e7f9b1 100644
--- a/llvm/test/CodeGen/Hexagon/expand-condsets-rm-reg.mir
+++ b/llvm/test/CodeGen/Hexagon/expand-condsets-rm-reg.mir
@@ -20,6 +20,7 @@
name: fred
tracksRegLiveness: true
+isSSA: false
registers:
- { id: 0, class: intregs }
- { id: 1, class: intregs }
@@ -35,7 +36,6 @@ body: |
bb.0:
liveins: $r0, $r1, $p0
%0 = COPY $r0
- %0 = COPY $r0 ; Force isSSA = false.
%1 = COPY $r1
%2 = COPY $p0
; Check that %3 was coalesced into %4.
diff --git a/llvm/test/CodeGen/MIR/Generic/machine-function-optionally-computed-properties.mir b/llvm/test/CodeGen/MIR/Generic/machine-function-optionally-computed-properties.mir
new file mode 100644
index 00000000000000..c833e380480021
--- /dev/null
+++ b/llvm/test/CodeGen/MIR/Generic/machine-function-optionally-computed-properties.mir
@@ -0,0 +1,42 @@
+# RUN: llc -run-pass none -o - %s | FileCheck %s
+# Test that we can disable certain properties that are normally computed
+
+---
+# CHECK-LABEL: name: TestNoPhis
+# CHECK: noPhis: true
+# CHECK: ...
+name: TestNoPhis
+...
+---
+# CHECK-LABEL: name: TestNoPhisOverride
+# CHECK: noPhis: false
+# CHECK: ...
+name: TestNoPhisOverride
+noPhis: false
+...
+---
+# CHECK-LABEL: name: TestIsSSA
+# CHECK: isSSA: true
+# CHECK: ...
+name: TestIsSSA
+...
+---
+# CHECK-LABEL: name: TestIsSSAOverride
+# CHECK: isSSA: false
+# CHECK: ...
+name: TestIsSSAOverride
+isSSA: false
+...
+---
+# CHECK-LABEL: name: TestNoVRegs
+# CHECK: noVRegs: true
+# CHECK: ...
+name: TestNoVRegs
+...
+---
+# CHECK-LABEL: name: TestNoVRegsOverride
+# CHECK: noVRegs: false
+# CHECK: ...
+name: TestNoVRegsOverride
+noVRegs: false
+...
diff --git a/llvm/test/CodeGen/X86/sjlj-shadow-stack-liveness.mir b/llvm/test/CodeGen/X86/sjlj-shadow-stack-liveness.mir
index 3def36f9d8ba91..83bc8ec510f646 100644
--- a/llvm/test/CodeGen/X86/sjlj-shadow-stack-liveness.mir
+++ b/llvm/test/CodeGen/X86/sjlj-shadow-stack-liveness.mir
@@ -14,6 +14,7 @@ name: bar
# CHECK-LABEL: name: bar
alignment: 16
tracksRegLiveness: true
+noPhis: false
body: |
bb.0:
%0:gr64 = IMPLICIT_DEF
@@ -29,8 +30,6 @@ body: |
; CHECK-NOT: MOV64rm killed %0
; CHECK-NEXT: MOV64rm killed %0
- ; FIXME: Dummy PHI to set the property NoPHIs to false. PR38439.
bb.2:
- %1:gr64 = PHI undef %1, %bb.2, undef %1, %bb.2
JMP_1 %bb.2
...
diff --git a/llvm/test/tools/llvm-reduce/mir/preserve-func-info.mir b/llvm/test/tools/llvm-reduce/mir/preserve-func-info.mir
index 5f11cea89d7e7b..f735dfd5cbbf01 100644
--- a/llvm/test/tools/llvm-reduce/mir/preserve-func-info.mir
+++ b/llvm/test/tools/llvm-reduce/mir/preserve-func-info.mir
@@ -14,6 +14,9 @@
# RESULT-NEXT: failedISel: true
# RESULT-NEXT: tracksRegLiveness: true
# RESULT-NEXT: hasWinCFI: true
+# RESULT-NEXT: noPhis: false
+# RESULT-NEXT: isSSA: false
+# RESULT-NEXT: noVRegs: false
# RESULT-NEXT: callsEHReturn: true
# RESULT-NEXT: callsUnwindInit: true
# RESULT-NEXT: hasEHCatchret: true
@@ -41,6 +44,9 @@ selected: true
failedISel: true
tracksRegLiveness: true
hasWinCFI: true
+noPhis: false
+isSSA: false
+noVRegs: false
failsVerification: true
tracksDebugUserValues: true
callsEHReturn: true
>From 56b41696a977507eabce8fcaee3429ad8097fd74 Mon Sep 17 00:00:00 2001
From: Dominik Montada <dominik.montada at arm.com>
Date: Mon, 16 Sep 2024 09:13:01 +0200
Subject: [PATCH 2/3] Add tests for explicit true values and conflicting values
---
...unction-optionally-computed-properties.mir | 63 ++++++++++++++++++-
1 file changed, 62 insertions(+), 1 deletion(-)
diff --git a/llvm/test/CodeGen/MIR/Generic/machine-function-optionally-computed-properties.mir b/llvm/test/CodeGen/MIR/Generic/machine-function-optionally-computed-properties.mir
index c833e380480021..0cbdd8e1579430 100644
--- a/llvm/test/CodeGen/MIR/Generic/machine-function-optionally-computed-properties.mir
+++ b/llvm/test/CodeGen/MIR/Generic/machine-function-optionally-computed-properties.mir
@@ -1,5 +1,9 @@
# RUN: llc -run-pass none -o - %s | FileCheck %s
-# Test that we can disable certain properties that are normally computed
+# Test that we can disable certain properties that are normally computed. This
+# override is a soft-override (only allows overriding when it relaxes the
+# property). Therefore, a conflicting override (e.g. setting noPhis to true in
+# the presence of PHI nodes) should not result in an error, but instead should
+# use the computed property instead (noPhis = false in the mentioned example).
---
# CHECK-LABEL: name: TestNoPhis
@@ -15,6 +19,28 @@ name: TestNoPhisOverride
noPhis: false
...
---
+# CHECK-LABEL: name: TestNoPhisOverrideTrue
+# CHECK: noPhis: true
+# CHECK: ...
+name: TestNoPhisOverrideTrue
+noPhis: true
+...
+---
+# CHECK-LABEL: name: TestNoPhisOverrideConflict
+# CHECK: noPhis: false
+# CHECK: ...
+name: TestNoPhisOverrideConflict
+noPhis: true
+tracksRegLiveness: true
+body: |
+ bb.0:
+ %0:_(s32) = IMPLICIT_DEF
+
+ bb.1:
+ %1:_(s32) = PHI %0, %bb.0, %0, %bb.1
+ G_BR %bb.1
+...
+---
# CHECK-LABEL: name: TestIsSSA
# CHECK: isSSA: true
# CHECK: ...
@@ -28,6 +54,24 @@ name: TestIsSSAOverride
isSSA: false
...
---
+# CHECK-LABEL: name: TestIsSSAOverrideTrue
+# CHECK: isSSA: true
+# CHECK: ...
+name: TestIsSSAOverrideTrue
+isSSA: true
+...
+---
+# CHECK-LABEL: name: TestIsSSAOverrideConflict
+# CHECK: isSSA: false
+# CHECK: ...
+name: TestIsSSAOverrideConflict
+isSSA: true
+body: |
+ bb.0:
+ %0:_(s32) = IMPLICIT_DEF
+ %0:_(s32) = IMPLICIT_DEF
+...
+---
# CHECK-LABEL: name: TestNoVRegs
# CHECK: noVRegs: true
# CHECK: ...
@@ -40,3 +84,20 @@ name: TestNoVRegs
name: TestNoVRegsOverride
noVRegs: false
...
+---
+# CHECK-LABEL: name: TestNoVRegsOverrideTrue
+# CHECK: noVRegs: true
+# CHECK: ...
+name: TestNoVRegsOverrideTrue
+noVRegs: true
+...
+---
+# CHECK-LABEL: name: TestNoVRegsOverrideConflict
+# CHECK: noVRegs: false
+# CHECK: ...
+name: TestNoVRegsOverrideConflict
+noVRegs: true
+body: |
+ bb.0:
+ %0:_(s32) = IMPLICIT_DEF
+...
>From a20fdb7ef69f1383fd33d2fe24aeb5c4c737e92c Mon Sep 17 00:00:00 2001
From: Dominik Montada <dominik.montada at arm.com>
Date: Thu, 19 Sep 2024 13:31:06 +0200
Subject: [PATCH 3/3] Revert redundant changes to tests
---
llvm/test/CodeGen/AMDGPU/early-tailduplicator-nophis.mir | 4 +---
1 file changed, 1 insertion(+), 3 deletions(-)
diff --git a/llvm/test/CodeGen/AMDGPU/early-tailduplicator-nophis.mir b/llvm/test/CodeGen/AMDGPU/early-tailduplicator-nophis.mir
index 9fcbdac0ff9d1f..2cb84c7ef4637d 100644
--- a/llvm/test/CodeGen/AMDGPU/early-tailduplicator-nophis.mir
+++ b/llvm/test/CodeGen/AMDGPU/early-tailduplicator-nophis.mir
@@ -2,13 +2,11 @@
# RUN: llc -mtriple=amdgcn-amd-amdhsa -mcpu=gfx900 -run-pass=early-tailduplication -verify-machineinstrs -o - %s | FileCheck %s
# There are no phis in this testcase. Early tail duplication introduces them,
- # so the NoPHIs property needs to be set explicitly to false to avoid verifier
- # errors
+ # so the NoPHIs property needs to be cleared to avoid verifier errors
---
name: tail_duplicate_nophis
tracksRegLiveness: true
-noPhis: false
body: |
; CHECK-LABEL: name: tail_duplicate_nophis
; CHECK: bb.0:
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