#define r10(p,q,r,s) 0x##s##r##q##p
#undef r
#define r r10
const word it_tab[4][256] = { r(const, const, const, const),
r(.......), r(.......) ....... };
All of this is done inside the function I want the alloc in. The variable
is not declared/defined/used anywhere else.
On Wed, Aug 15, 2012 at 12:00 PM, Eli Friedman <eli.friedman at
gmail.com>wrote:
> On Wed, Aug 15, 2012 at 11:40 AM, Ryan Taylor <ryta1203 at gmail.com>
wrote:
> > Eli, thanks for responding, unfortunately, this did not resolve my
issue.
> > It's a locally allocated array in the C code, but I'm not
seeing any
> alloca
> > in the IR just geps from the variable, which is never setup.
>
> That's strange; I just checked, and -fno-merge-all-constants
> definitely does have an effect for a simple testcase like the
> following (just using clang -emit-llvm at -O0):
>
> void f() { const int x[5] = {1,2,3,4}; }
>
> What does your testcase look like?
>
> -Eli
>
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So there are some #define (defined outside the function scope) that use it_tab that are used inside the function, is this why it is promoting it to a global? On Wed, Aug 15, 2012 at 2:57 PM, Ryan Taylor <ryta1203 at gmail.com> wrote:> #define r10(p,q,r,s) 0x##s##r##q##p > #undef r > #define r r10 > const word it_tab[4][256] = { r(const, const, const, const), > r(.......), r(.......) ....... }; > > All of this is done inside the function I want the alloc in. The variable > is not declared/defined/used anywhere else. > > > > > On Wed, Aug 15, 2012 at 12:00 PM, Eli Friedman <eli.friedman at gmail.com>wrote: > >> On Wed, Aug 15, 2012 at 11:40 AM, Ryan Taylor <ryta1203 at gmail.com> wrote: >> > Eli, thanks for responding, unfortunately, this did not resolve my >> issue. >> > It's a locally allocated array in the C code, but I'm not seeing any >> alloca >> > in the IR just geps from the variable, which is never setup. >> >> That's strange; I just checked, and -fno-merge-all-constants >> definitely does have an effect for a simple testcase like the >> following (just using clang -emit-llvm at -O0): >> >> void f() { const int x[5] = {1,2,3,4}; } >> >> What does your testcase look like? >> >> -Eli >> > >-------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20120815/85c4e239/attachment.html>
On Wed, Aug 15, 2012 at 3:17 PM, Ryan Taylor <ryta1203 at gmail.com> wrote:> So there are some #define (defined outside the function scope) that use > it_tab that are used inside the function, is this why it is promoting it to > a global?Macros shouldn't matter. Please give a complete testcase and steps to reproduce. And please don't top-post. -Eli> > On Wed, Aug 15, 2012 at 2:57 PM, Ryan Taylor <ryta1203 at gmail.com> wrote: >> >> #define r10(p,q,r,s) 0x##s##r##q##p >> #undef r >> #define r r10 >> const word it_tab[4][256] = { r(const, const, const, const), >> r(.......), r(.......) ....... }; >> >> All of this is done inside the function I want the alloc in. The variable >> is not declared/defined/used anywhere else. >> >> >> >> >> On Wed, Aug 15, 2012 at 12:00 PM, Eli Friedman <eli.friedman at gmail.com> >> wrote: >>> >>> On Wed, Aug 15, 2012 at 11:40 AM, Ryan Taylor <ryta1203 at gmail.com> wrote: >>> > Eli, thanks for responding, unfortunately, this did not resolve my >>> > issue. >>> > It's a locally allocated array in the C code, but I'm not seeing any >>> > alloca >>> > in the IR just geps from the variable, which is never setup. >>> >>> That's strange; I just checked, and -fno-merge-all-constants >>> definitely does have an effect for a simple testcase like the >>> following (just using clang -emit-llvm at -O0): >>> >>> void f() { const int x[5] = {1,2,3,4}; } >>> >>> What does your testcase look like? >>> >>> -Eli >> >> >