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[GlobalOpt] Fix global SRA incorrect alignment on some elements #115328

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Merged
nikic merged 4 commits into from
Nov 18, 2024
Merged

[GlobalOpt] Fix global SRA incorrect alignment on some elements #115328

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2d1cd65
[GlobalOpt] Fix global SRA incorrect use of original alignment on som…
brunodf-snps Nov 7, 2024
f5151ec
Checking for ABI type align is unnecessary
brunodf-snps Nov 7, 2024
0a59028
[GlobalOpt] Add test case for issue #115282
brunodf-snps Nov 7, 2024
f281c80
Update test case after fix
brunodf-snps Nov 7, 2024
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7 changes: 4 additions & 3 deletions llvm/lib/Transforms/IPO/GlobalOpt.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -575,15 +575,16 @@ static GlobalVariable *SRAGlobal(GlobalVariable *GV, const DataLayout &DL) {
*GV->getParent(), Ty, false, GlobalVariable::InternalLinkage,
Initializer, GV->getName() + "." + Twine(NameSuffix++), GV,
GV->getThreadLocalMode(), GV->getAddressSpace());
// Start out by copying attributes from the original, including alignment.
NGV->copyAttributesFrom(GV);
NewGlobals.insert({OffsetForTy, NGV});

// Calculate the known alignment of the field. If the original aggregate
// had 256 byte alignment for example, something might depend on that:
// had 256 byte alignment for example, then the element at a given offset
// may also have a known alignment, and something might depend on that:
// propagate info to each field.
Align NewAlign = commonAlignment(StartAlignment, OffsetForTy);
if (NewAlign > DL.getABITypeAlign(Ty))
NGV->setAlignment(NewAlign);
NGV->setAlignment(std::max(NewAlign, DL.getABITypeAlign(Ty)));

// Copy over the debug info for the variable.
transferSRADebugInfo(GV, NGV, OffsetForTy * 8,
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2 changes: 1 addition & 1 deletion llvm/test/DebugInfo/X86/global-sra-struct-fit-segment.ll
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Expand Up @@ -20,7 +20,7 @@
%struct.BSS1 = type <{ [12 x i8] }>

;CHECK: @.BSS1.0 = internal unnamed_addr global i32 0, align 32, !dbg ![[GVE1:.*]]
;CHECK: @.BSS1.1 = internal unnamed_addr global i32 0, align 32, !dbg ![[GVE2:.*]], !dbg ![[GVE4:.*]]
;CHECK: @.BSS1.1 = internal unnamed_addr global i32 0, align 4, !dbg ![[GVE2:.*]], !dbg ![[GVE4:.*]]
;CHECK: @.BSS1.2 = internal unnamed_addr global i32 0, align 8, !dbg ![[GVE3:.*]]

@.BSS1 = internal global %struct.BSS1 zeroinitializer, align 32, !dbg !0, !dbg !7, !dbg !10, !dbg !27, !dbg !29
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2 changes: 1 addition & 1 deletion llvm/test/DebugInfo/X86/global-sra-struct-part-overlap-segment.ll
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Expand Up @@ -26,7 +26,7 @@

@.BSS3 = internal unnamed_addr global %struct.BSS3 zeroinitializer, align 32, !dbg !0, !dbg !7, !dbg !29
;CHECK: @.BSS3.0 = internal unnamed_addr global double 0.000000e+00, align 32, !dbg ![[GVE1:.*]], !dbg ![[GVE2:.*]]
;CHECK: @.BSS3.1 = internal unnamed_addr global double 0.000000e+00, align 32, !dbg ![[GVE3:.*]], !dbg ![[GVE4:.*]], !dbg ![[GVE6:.*]]
;CHECK: @.BSS3.1 = internal unnamed_addr global double 0.000000e+00, align 8, !dbg ![[GVE3:.*]], !dbg ![[GVE4:.*]], !dbg ![[GVE6:.*]]
;CHECK: @.BSS3.2 = internal unnamed_addr global double 0.000000e+00, align 16, !dbg ![[GVE5:.*]]

@.C363_mymod_bar_ = internal constant [2 x i8] c"IF"
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8 changes: 4 additions & 4 deletions llvm/test/Transforms/GlobalOpt/globalsra-align.ll
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Expand Up @@ -15,9 +15,9 @@ target datalayout = "p:16:32:64" ; 16-bit pointers with 32-bit ABI alignment and

;.
; CHECK: @[[A_4:[a-zA-Z0-9_$"\\.-]+]] = internal unnamed_addr externally_initialized global ptr null, align 8
; CHECK: @[[A_5:[a-zA-Z0-9_$"\\.-]+]] = internal unnamed_addr externally_initialized global ptr null, align 16
; CHECK: @[[A_5:[a-zA-Z0-9_$"\\.-]+]] = internal unnamed_addr externally_initialized global ptr null, align 8
; CHECK: @[[A_6:[a-zA-Z0-9_$"\\.-]+]] = internal unnamed_addr externally_initialized global ptr null, align 16
; CHECK: @[[A_7:[a-zA-Z0-9_$"\\.-]+]] = internal unnamed_addr externally_initialized global ptr null, align 16
; CHECK: @[[A_7:[a-zA-Z0-9_$"\\.-]+]] = internal unnamed_addr externally_initialized global ptr null, align 8
;.
define ptr @reduce_align_0() {
; CHECK-LABEL: @reduce_align_0(
Expand All @@ -31,7 +31,7 @@ define ptr @reduce_align_0() {

define ptr @reduce_align_1() {
; CHECK-LABEL: @reduce_align_1(
; CHECK-NEXT: [[X:%.*]] = load ptr, ptr @a.5, align 16
; CHECK-NEXT: [[X:%.*]] = load ptr, ptr @a.5, align 8
; CHECK-NEXT: ret ptr [[X]]
;
%x = load ptr, ptr getelementptr inbounds ([3 x [7 x ptr]], ptr @a, i64 0, i64 2, i64 1), align 4
Expand All @@ -51,7 +51,7 @@ define ptr @reduce_align_2() {

define ptr @reduce_align_3() {
; CHECK-LABEL: @reduce_align_3(
; CHECK-NEXT: [[X:%.*]] = load ptr, ptr @a.7, align 16
; CHECK-NEXT: [[X:%.*]] = load ptr, ptr @a.7, align 8
; CHECK-NEXT: ret ptr [[X]]
;
%x = load ptr, ptr getelementptr inbounds ([3 x [7 x ptr]], ptr @a, i64 0, i64 2, i64 3), align 4
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