------- Comment #5 from ramana dot radhakrishnan at codito dot com 2006-06-26 19:13 ------- This should be reopened. A related testcase shows a regression from 3.4.6 to 4.1.1 for m68k-elf shows a regression . combine used to take care of this in 3.4.6 . A backport of the patch is ready with me. If its allowed, I'll put it up .
This is the test case . #include <stdio.h> int i; int main (void) { if ( ((i & ~1) | 1) != ( i | 1)) printf ("abc"); } 3.4.6 generated .file "fail.c" .text .align 2 .globl foo .type foo, @function foo: link.w %a6,#0 unlk %a6 rts .size foo, .-foo .comm i,4,2 .ident "GCC: (GNU) 3.4.6" 4.1.2 pre-release generates .file "fail.c" .section .rodata.str1.1,"aMS",@progbits,1 .LC0: .string "abc" .text .align 2 .globl main .type main, @function main: link.w %fp,#0 move.l %d2,-(%sp) move.l i,%d1 moveq #-2,%d0 and.l %d1,%d0 moveq #1,%d2 or.l %d2,%d0 or.l %d2,%d1 cmp.l %d0,%d1 jbeq .L5 pea .LC0 jbsr printf addq.l #4,%sp .L5: move.l -4(%fp),%d2 unlk %fp rts .size main, .-main .comm i,4,2 .ident "GCC: (GNU) 4.1.2 20060623 (prerelease)" -- ramana dot radhakrishnan at codito dot com changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |ramana dot radhakrishnan at | |codito dot com http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24427