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https://github.com/c64scene-ar/llvm-6502.git
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9e23336d0c
entry: 0x12049d0, LLVM BB @0x1201fd0, ID#0:
Live Ins: %EAX %EDX %ECX
%reg1031<def> = MOVPC32r 0
%reg1032<def> = ADD32ri %reg1031, <es:_GLOBAL_OFFSET_TABLE_>, %EFLAGS<imp-def>
%reg1028<def> = MOV32rr %EAX
%reg1029<def> = MOV32rr %EDX
%reg1030<def> = MOV32rr %ECX
%reg1027<def> = MOV8rm %reg0, 1, %reg0, 0, Mem:LD(1,1) [0x1201910 + 0]
%reg1025<def> = MOV32rr %reg1029
%reg1026<def> = MOV32rr %reg1030
%reg1024<def> = MOV32rr %reg1028
The copies unnecessarily increase register pressure and it will end up requiring a physical register to be spilled.
With -schedule-livein-copies:
entry: 0x12049d0, LLVM BB @0x1201fa0, ID#0:
Live Ins: %EAX %EDX %ECX
%reg1031<def> = MOVPC32r 0
%reg1032<def> = ADD32ri %reg1031, <es:_GLOBAL_OFFSET_TABLE_>, %EFLAGS<imp-def>
%reg1024<def> = MOV32rr %EAX
%reg1025<def> = MOV32rr %EDX
%reg1026<def> = MOV32rr %ECX
%reg1027<def> = MOV8rm %reg0, 1, %reg0, 0, Mem:LD(1,1) [0x12018e0 + 0]
Much better!
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@48307 91177308-0d34-0410-b5e6-96231b3b80d8
16 lines
735 B
LLVM
16 lines
735 B
LLVM
; RUN: llvm-as < %s | llc -mtriple=i386-pc-linux-gnu -relocation-model=pic -disable-fp-elim
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; RUN: llvm-as < %s | llc -mtriple=i386-pc-linux-gnu -relocation-model=pic -disable-fp-elim -schedule-livein-copies | not grep {Number of register spills}
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; PR2134
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declare fastcc i8* @w_addchar(i8*, i32*, i32*, i8 signext ) nounwind
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define x86_stdcallcc i32 @parse_backslash(i8** inreg %word, i32* inreg %word_length, i32* inreg %max_length) nounwind {
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entry:
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%tmp6 = load i8* null, align 1 ; <i8> [#uses=1]
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br label %bb13
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bb13: ; preds = %entry
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%tmp26 = call fastcc i8* @w_addchar( i8* null, i32* %word_length, i32* %max_length, i8 signext %tmp6 ) nounwind ; <i8*> [#uses=1]
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store i8* %tmp26, i8** %word, align 4
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ret i32 0
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}
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