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5379f412bc
172 %ECX<def> = MOV32rr %reg1039<kill>
180 INLINEASM <es:subl $5,$1
sbbl $3,$0>, 10, %EAX<def>, 14, %ECX<earlyclobber,def>, 9, %EAX<kill>,
36, <fi#0>, 1, %reg0, 0, 9, %ECX<kill>, 36, <fi#1>, 1, %reg0, 0
188 %EAX<def> = MOV32rr %EAX<kill>
196 %ECX<def> = MOV32rr %ECX<kill>
204 %ECX<def> = MOV32rr %ECX<kill>
212 %EAX<def> = MOV32rr %EAX<kill>
220 %EAX<def> = MOV32rr %EAX
228 %reg1039<def> = MOV32rr %ECX<kill>
The early clobber operand ties ECX input to the ECX def.
The live interval of ECX is represented as this:
%reg20,inf = [46,47:1)[174,230:0) 0@174-(230) 1@46-(47)
The right way to represent this is something like
%reg20,inf = [46,47:2)[174,182:1)[181:230:0) 0@174-(182) 1@181-230 @2@46-(47)
Of course that won't work since that means overlapping live ranges defined by two val#.
The workaround for now is to add a bit to val# which says the val# is redefined by a early clobber def somewhere. This prevents the move at 228 from being optimized away by SimpleRegisterCoalescing::AdjustCopiesBackFrom.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@61259 91177308-0d34-0410-b5e6-96231b3b80d8
33 lines
1.5 KiB
LLVM
33 lines
1.5 KiB
LLVM
; RUN: llvm-as < %s | llc -mtriple=i386-apple-darwin | %prcontext End 1 | grep {movl.*%ecx}
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; PR3149
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@"\01LC" = internal constant [7 x i8] c"n0=%d\0A\00" ; <[7 x i8]*> [#uses=1]
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@llvm.used = appending global [1 x i8*] [ i8* bitcast (i32 (i64, i64)* @umoddi3 to i8*) ], section "llvm.metadata" ; <[1 x i8*]*> [#uses=0]
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define i32 @umoddi3(i64 %u, i64 %v) nounwind noinline {
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entry:
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%0 = trunc i64 %v to i32 ; <i32> [#uses=2]
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%1 = trunc i64 %u to i32 ; <i32> [#uses=4]
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%2 = lshr i64 %u, 32 ; <i64> [#uses=1]
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%3 = trunc i64 %2 to i32 ; <i32> [#uses=2]
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%4 = tail call i32 (i8*, ...)* @printf(i8* getelementptr ([7 x i8]* @"\01LC", i32 0, i32 0), i32 %1) nounwind ; <i32> [#uses=0]
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%5 = icmp ult i32 %1, %0 ; <i1> [#uses=1]
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br i1 %5, label %bb2, label %bb
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bb: ; preds = %entry
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%6 = lshr i64 %v, 32 ; <i64> [#uses=1]
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%7 = trunc i64 %6 to i32 ; <i32> [#uses=1]
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%asmtmp = tail call { i32, i32 } asm "subl $5,$1\0A\09sbbl $3,$0", "=r,=&r,0,imr,1,imr,~{dirflag},~{fpsr},~{flags}"(i32 %3, i32 %7, i32 %1, i32 %0) nounwind ; <{ i32, i32 }> [#uses=2]
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%asmresult = extractvalue { i32, i32 } %asmtmp, 0 ; <i32> [#uses=1]
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%asmresult1 = extractvalue { i32, i32 } %asmtmp, 1 ; <i32> [#uses=1]
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br label %bb2
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bb2: ; preds = %bb, %entry
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%n1.0 = phi i32 [ %asmresult, %bb ], [ %3, %entry ] ; <i32> [#uses=1]
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%n0.0 = phi i32 [ %asmresult1, %bb ], [ %1, %entry ] ; <i32> [#uses=1]
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%8 = add i32 %n0.0, %n1.0 ; <i32> [#uses=1]
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ret i32 %8
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}
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declare i32 @printf(i8*, ...) nounwind
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