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c9ad3ab624
The pass used to be enabled by default with CodeGenOpt::Less (-O1). This is too aggressive, considering the pass indiscriminately merges all globals together. Currently, performance doesn't always improve, and, on code that uses few globals (e.g., the odd file- or function- static), more often than not is degraded by the optimization. Lengthy discussion can be found on llvmdev (AArch64-focused; ARM has similar problems): http://lists.cs.uiuc.edu/pipermail/llvmdev/2015-February/082800.html Also, it makes tooling and debuggers less useful when dealing with globals and data sections. GlobalMerge needs to better identify those cases that benefit, and this will be done separately. In the meantime, move the pass to run with -O3 rather than -O1, on both ARM and AArch64. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@233024 91177308-0d34-0410-b5e6-96231b3b80d8
87 lines
5.0 KiB
LLVM
87 lines
5.0 KiB
LLVM
; RUN: llc %s -O0 -o - | FileCheck -check-prefix=NO-MERGE %s
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; RUN: llc %s -O1 -o - | FileCheck -check-prefix=NO-MERGE %s
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; RUN: llc %s -O1 -o - -enable-global-merge=false | FileCheck -check-prefix=NO-MERGE %s
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; RUN: llc %s -O1 -o - -enable-global-merge=true | FileCheck -check-prefix=NO-MERGE %s
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; RUN: llc %s -O3 -o - | FileCheck -check-prefix=MERGE %s
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; RUN: llc %s -O3 -o - -enable-global-merge=false | FileCheck -check-prefix=NO-MERGE %s
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; RUN: llc %s -O3 -o - -enable-global-merge=true | FileCheck -check-prefix=MERGE %s
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; MERGE-NOT: .zerofill __DATA,__bss,_bar,20,2
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; MERGE-NOT: .zerofill __DATA,__bss,_baz,20,2
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; MERGE-NOT: .zerofill __DATA,__bss,_foo,20,2
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; MERGE: .zerofill __DATA,__bss,__MergedGlobals,60,4
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; MERGE-NOT: .zerofill __DATA,__bss,_bar,20,2
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; MERGE-NOT: .zerofill __DATA,__bss,_baz,20,2
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; MERGE-NOT: .zerofill __DATA,__bss,_foo,20,2
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; NO-MERGE-NOT: .zerofill __DATA,__bss,__MergedGlobals,60,4
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; NO-MERGE: .zerofill __DATA,__bss,_bar,20,2
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; NO-MERGE: .zerofill __DATA,__bss,_baz,20,2
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; NO-MERGE: .zerofill __DATA,__bss,_foo,20,2
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; NO-MERGE-NOT: .zerofill __DATA,__bss,__MergedGlobals,60,4
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target datalayout = "e-p:32:32:32-i1:8:32-i8:8:32-i16:16:32-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:32:64-v128:32:128-a0:0:32-n32-S32"
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target triple = "thumbv7-apple-ios3.0.0"
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@bar = internal global [5 x i32] zeroinitializer, align 4
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@baz = internal global [5 x i32] zeroinitializer, align 4
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@foo = internal global [5 x i32] zeroinitializer, align 4
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; Function Attrs: nounwind ssp
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define internal void @initialize() #0 {
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%1 = tail call i32 bitcast (i32 (...)* @calc to i32 ()*)() #3
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store i32 %1, i32* getelementptr inbounds ([5 x i32], [5 x i32]* @bar, i32 0, i32 0), align 4, !tbaa !1
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%2 = tail call i32 bitcast (i32 (...)* @calc to i32 ()*)() #3
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store i32 %2, i32* getelementptr inbounds ([5 x i32], [5 x i32]* @baz, i32 0, i32 0), align 4, !tbaa !1
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%3 = tail call i32 bitcast (i32 (...)* @calc to i32 ()*)() #3
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store i32 %3, i32* getelementptr inbounds ([5 x i32], [5 x i32]* @bar, i32 0, i32 1), align 4, !tbaa !1
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%4 = tail call i32 bitcast (i32 (...)* @calc to i32 ()*)() #3
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store i32 %4, i32* getelementptr inbounds ([5 x i32], [5 x i32]* @baz, i32 0, i32 1), align 4, !tbaa !1
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%5 = tail call i32 bitcast (i32 (...)* @calc to i32 ()*)() #3
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store i32 %5, i32* getelementptr inbounds ([5 x i32], [5 x i32]* @bar, i32 0, i32 2), align 4, !tbaa !1
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%6 = tail call i32 bitcast (i32 (...)* @calc to i32 ()*)() #3
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store i32 %6, i32* getelementptr inbounds ([5 x i32], [5 x i32]* @baz, i32 0, i32 2), align 4, !tbaa !1
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%7 = tail call i32 bitcast (i32 (...)* @calc to i32 ()*)() #3
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store i32 %7, i32* getelementptr inbounds ([5 x i32], [5 x i32]* @bar, i32 0, i32 3), align 4, !tbaa !1
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%8 = tail call i32 bitcast (i32 (...)* @calc to i32 ()*)() #3
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store i32 %8, i32* getelementptr inbounds ([5 x i32], [5 x i32]* @baz, i32 0, i32 3), align 4, !tbaa !1
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%9 = tail call i32 bitcast (i32 (...)* @calc to i32 ()*)() #3
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store i32 %9, i32* getelementptr inbounds ([5 x i32], [5 x i32]* @bar, i32 0, i32 4), align 4, !tbaa !1
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%10 = tail call i32 bitcast (i32 (...)* @calc to i32 ()*)() #3
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store i32 %10, i32* getelementptr inbounds ([5 x i32], [5 x i32]* @baz, i32 0, i32 4), align 4, !tbaa !1
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ret void
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}
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declare i32 @calc(...) #1
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; Function Attrs: nounwind ssp
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define internal void @calculate() #0 {
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%1 = load <4 x i32>, <4 x i32>* bitcast ([5 x i32]* @bar to <4 x i32>*), align 4
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%2 = load <4 x i32>, <4 x i32>* bitcast ([5 x i32]* @baz to <4 x i32>*), align 4
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%3 = mul <4 x i32> %2, %1
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store <4 x i32> %3, <4 x i32>* bitcast ([5 x i32]* @foo to <4 x i32>*), align 4
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%4 = load i32, i32* getelementptr inbounds ([5 x i32], [5 x i32]* @bar, i32 0, i32 4), align 4, !tbaa !1
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%5 = load i32, i32* getelementptr inbounds ([5 x i32], [5 x i32]* @baz, i32 0, i32 4), align 4, !tbaa !1
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%6 = mul nsw i32 %5, %4
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store i32 %6, i32* getelementptr inbounds ([5 x i32], [5 x i32]* @foo, i32 0, i32 4), align 4, !tbaa !1
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ret void
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}
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; Function Attrs: nounwind readnone ssp
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define internal i32* @returnFoo() #2 {
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ret i32* getelementptr inbounds ([5 x i32], [5 x i32]* @foo, i32 0, i32 0)
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}
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attributes #0 = { nounwind ssp "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
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attributes #1 = { "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
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attributes #2 = { nounwind readnone ssp "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
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attributes #3 = { nounwind }
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!llvm.ident = !{!0}
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!0 = !{!"LLVM version 3.4 "}
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!1 = !{!2, !2, i64 0}
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!2 = !{!"int", !3, i64 0}
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!3 = !{!"omnipotent char", !4, i64 0}
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!4 = !{!"Simple C/C++ TBAA"}
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