I got an internal compiler error when compiling the following. The function my_atan is actaully derived from aton expanded from a C libray header. Other then its name, it is almost identical to atan(). dougkwan@f666g:~/delta-2006.08.03/verify_ssa$ ./gcc -O2 PJ_geos.4.c PJ_geos.4.c: In function 'e_forward': PJ_geos.4.c:22: error: definition in block 2 follows the use for SSA_NAME: result_9 in statement: sincostmp.17_15 = __builtin_cexpi (result_9); PJ_geos.4.c:22: internal compiler error: verify_ssa failed Please submit a full bug report, with preprocessed source if appropriate. See <http://gcc.gnu.org/bugs.html> for instructions. -------------------- extern double hypot (double, double); extern double cos (double); extern double sin (double); double my_atan (double x) { register double result; asm volatile ("fld1; fpatan" : "=t" (result) : "0" (x) : "st(1)"); return result; } typedef struct { double phi; } LP; void e_forward(LP lp, double x) { lp.phi = my_atan (x); x = hypot(cos (lp.phi), sin (lp.phi)); } ---------------------
*** Bug 34968 has been marked as a duplicate of this bug. ***
(In reply to comment #0) A slightly simpler test case: -------------- extern double sin (double), cos (double); __inline double atan (double __x) { register double __result; __asm __volatile__ ("fld1; fpatan" : "=t" (__result) : "0" (__x) : "st(1)"); return __result; } double f(double x) { double t = atan (x); return cos (t) + sin (t); } -------------
Mine. Actually we do not see the SSA_NAME definition in the asm stmt and so insert in the wrong place.
Fixed.
Subject: Bug 34966 Author: rguenth Date: Fri Jan 25 12:08:52 2008 New Revision: 131824 URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=131824 Log: 2008-01-25 Richard Guenther <rguenther@suse.de> PR tree-optimization/34966 * tree-ssa-math-opts.c (execute_cse_sincos_1): For all but default defs and PHI_NODEs we have to insert after the defining statement. * gcc.c-torture/compile/pr34966.c: New testcase. Added: trunk/gcc/testsuite/gcc.c-torture/compile/pr34966.c Modified: trunk/gcc/ChangeLog trunk/gcc/testsuite/ChangeLog trunk/gcc/tree-ssa-math-opts.c