http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47028
--- Comment #1 from Zdenek Sojka <zsojka at seznam dot cz> 2010-12-20 19:20:12 UTC --- Created attachment 22833 --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=22833 another testcase (reduced from gcc.dg/tree-ssa/tailrecursion-7.c) I hope this is the same problem as the first testcase. $ gcc -O -foptimize-sibling-calls -fno-tree-copy-prop -fno-tree-dominator-opts pr47028-2.c $ ./a.out Aborted (it takes some time to run, the inner loop is done 2^32-1 times instead of n-1) When the assembly is changed in the following way: --- pr47028-2.s 2010-12-20 20:16:12.000000000 +0100 +++ pr47028-2-fixed.s 2010-12-20 20:16:26.000000000 +0100 @@ -41,7 +41,7 @@ foo: .LFB0: .cfi_startproc - mov edx, 0 # n, + mov edx, edi # n, mov eax, 1 # mul_tmp.4, mov esi, 0 # add_acc.1, test edi, edi # n it works fine. edx is loaded by '0' instead of 'n'.
