<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Dmitry,<div>You might be better served by filing this as a bug (<a href="http://llvm.org/bugs/">http://llvm.org/bugs/</a>). Please include a test case and the steps to reproduce (i.e., what you've provided below).</div><div><br></div><div> Chad</div><div><br><div><div>On Jul 10, 2012, at 3:15 PM, Dmitry N. Mikushin wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite">Hi,<br><br>Looks like "{" and "}" are lost when trying to use the combination of Clang and NVPTX, which may result into clash of definitions of the function-scope and asm-scope. Here is an example:<br><br>
> cat <a href="http://test.cu/">test.cu</a><br>__attribute__((device)) __attribute__((nv_linkonce_odr)) __inline__ int __any(int a) {<br> int result;<br> asm __volatile__ ("{ \n\t"<br> ".reg .pred \t%%p1; \n\t"<br>
".reg .pred \t%%p2; \n\t"<br> "setp.ne.u32 \t%%p1, %1, 0; \n\t"<br> "vote.any.pred \t%%p2, %%p1; \n\t"<br> "selp.s32 \t%0, 1, 0, %%p2; \n\t"<br> "}" : "=r"(result) : "r"(a));<br>
return result;<br>}<br><br>> clang -cc1 -emit-llvm -fcuda-is-device -triple ptx64-unknown-unknown <a href="http://test.cu/">test.cu</a> -o test.ll<br>> cat test.ll<br>; ModuleID = '<a href="http://test.cu/">test.cu</a>'<br>
target datalayout = "e-p:64:64-i64:64:64-f64:64:64-n1:8:16:32:64"<br>target triple = "ptx64-unknown-unknown"<br><br>define ptx_device i32 @_Z5__anyi(i32 %a) nounwind inlinehint {<br>entry:<br> %a.addr = alloca i32, align 4<br>
%result = alloca i32, align 4<br> store i32 %a, i32* %a.addr, align 4<br> %0 = load i32* %a.addr, align 4<br> %1 = call i32 asm sideeffect "$( \0A\09.reg .pred \09%p1; \0A\09.reg .pred \09%p2; \0A\09setp.ne.u32 \09%p1, $1, 0; \0A\09vote.any.pred \09%p2, %p1; \0A\09selp.s32 \09$0, 1, 0, %p2; \0A\09$)", "=r,r"(i32 %0) nounwind, !srcloc !0<br>
store i32 %1, i32* %result, align 4<br> %2 = load i32* %result, align 4<br> ret i32 %2<br>}<br><br>!0 = metadata !{i32 127, i32 132, i32 166, i32 200, i32 242, i32 285, i32 327}<br><br>> llc -march=nvptx64 test.ll -o test.ptx<br>
> cat test.ptx<br>//<br>// Generated by LLVM NVPTX Back-End<br>//<br><br>.version 3.0<br>.target sm_10, texmode_independent<br>.address_size 64<br><br><br> // .globl _Z5__anyi<br>.visible .global .align 4 .b8 __local_depot0[8];<br>
<br>.func (.reg .b32 func_retval0) _Z5__anyi(<br> .reg .b32 _Z5__anyi_param_0<br>) // @_Z5__anyi<br>{<br> .reg .b64 %SP;<br> .reg .b64 %SPL;<br> .reg .pred %p<396>;<br>
.reg .s16 %rc<396>;<br> .reg .s16 %rs<396>;<br> .reg .s32 %r<396>;<br> .reg .s64 %rl<396>;<br> .reg .f32 %f<396>;<br> .reg .f64 %fl<396>;<br><br>// BB#0: // %entry<br>
mov.u64 %SP, __local_depot0;<br> mov.b32 %r0, _Z5__anyi_param_0;<br> st.global.u32 [%SP+0], %r0;<br> // inline asm<br> <br> .reg .pred %p1; <br> .reg .pred %p2; <br> setp.ne.u32 %p1, %r0, 0; <br>
vote.any.pred %p2, %p1; <br> selp.s32 %r0, 1, 0, %p2; <br> <br> // inline asm<br> st.global.u32 [%SP+4], %r0;<br> mov.b32 func_retval0, %r0;<br> ret;<br>}<br><br>> ptxas test.ptx -o test.cubin<br>
ptxas test.ptx, line 33; error : Duplicate definition of variable '%p1'<br>ptxas test.ptx, line 34; error : Duplicate definition of variable '%p2'<br>ptxas test.ptx, line 36; error : Instruction 'vote' requires .target sm_12 or higher<br>
ptxas fatal : Ptx assembly aborted due to errors<br><br>- D.<br><br>
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