PR1711 is an x86 codegen problem that is blocking adoption of llvm-gcc by people using linux on x86-64 boxes. Could someone with access to one of these boxes take a look? I'll help try to debug this, but I don't have access to a machine. I bet it's a small tweak required in the x86 backend. Thanks! -Chris
libcpp/charset.c:631 turns into:
%tmp16 = tail call i64 @strlen( i8* %to ) nounwind readonly
; <i64> [#uses=1]
%tmp18 = tail call i64 @strlen( i8* %from ) nounwind readonly
; <i64> [#uses=1]
%tmp19 = add i64 %tmp16, 2 ; <i64> [#uses=1]
%tmp20 = add i64 %tmp19, %tmp18 ; <i64> [#uses=1]
%tmp21 = tail call i8* @alloca( i64 %tmp20 ) nounwind
; <i8*> [#uses=5]
other allocas in that file become instructions.
Andrew
On 2/16/08, Chris Lattner <sabre at nondot.org>
wrote:> PR1711 is an x86 codegen problem that is blocking adoption of llvm-gcc
> by people using linux on x86-64 boxes. Could someone with access to
> one of these boxes take a look? I'll help try to debug this, but I
> don't have access to a machine. I bet it's a small tweak required
in
> the x86 backend.
>
> Thanks!
>
> -Chris
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> LLVMdev at cs.uiuc.edu http://llvm.cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>
Interestingly, in the .i file there are 2 __builtin_alloca, and EmitBuiltinAlloca is only being called once. Andrew On 2/16/08, Andrew Lenharth <andrewl at lenharth.org> wrote:> libcpp/charset.c:631 turns into: > > %tmp16 = tail call i64 @strlen( i8* %to ) nounwind readonly > ; <i64> [#uses=1] > %tmp18 = tail call i64 @strlen( i8* %from ) nounwind readonly > ; <i64> [#uses=1] > %tmp19 = add i64 %tmp16, 2 ; <i64> [#uses=1] > %tmp20 = add i64 %tmp19, %tmp18 ; <i64> [#uses=1] > %tmp21 = tail call i8* @alloca( i64 %tmp20 ) nounwind > ; <i8*> [#uses=5] > > other allocas in that file become instructions. > > Andrew > > On 2/16/08, Chris Lattner <sabre at nondot.org> wrote: > > PR1711 is an x86 codegen problem that is blocking adoption of llvm-gcc > > by people using linux on x86-64 boxes. Could someone with access to > > one of these boxes take a look? I'll help try to debug this, but I > > don't have access to a machine. I bet it's a small tweak required in > > the x86 backend. > > > > Thanks! > > > > -Chris > > _______________________________________________ > > LLVM Developers mailing list > > LLVMdev at cs.uiuc.edu http://llvm.cs.uiuc.edu > > http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev > > >