------- Comment #2 from ramana at gcc dot gnu dot org 2009-07-27 15:05 ------- This seems to be related to the other reassoc + register pressure bugs reported in the database. I am not sure if this is a dup of either PR28481 or PR27855 but they appear to be related.
With -fno-tree-reassoc I get the same code for both loops. time_math: push {r4, r5, r6, lr} bl dumm mov r4, #0 mov r6, #99 add r5, r0, #0 .L2: add r0, r5, #0 bl __aeabi_f2iz add r5, r5, #1 add r4, r4, r0 add r0, r5, #0 bl __aeabi_f2iz add r5, r5, #1 add r4, r4, r0 add r0, r5, #0 bl __aeabi_f2iz add r5, r5, #1 add r4, r4, r0 add r0, r5, #0 bl __aeabi_f2iz add r5, r5, #1 add r4, r4, r0 sub r6, r6, #1 bcs .L2 bl dumm mov r6, #99 add r5, r0, #0 .L3: add r0, r5, #0 bl MyConvert add r5, r5, #1 add r4, r4, r0 add r0, r5, #0 bl MyConvert add r5, r5, #1 add r4, r4, r0 add r0, r5, #0 bl MyConvert add r5, r5, #1 add r4, r4, r0 add r0, r5, #0 bl MyConvert add r5, r5, #1 add r4, r4, r0 sub r6, r6, #1 bcs .L3 mov r0, r4 @ sp needed for prologue pop {r4, r5, r6, pc} .size time_math, .-time_math .ident "GCC: (GNU) 4.5.0 20090727 (experimental)" -- ramana at gcc dot gnu dot org changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |dberlin at gcc dot gnu dot | |org Status|UNCONFIRMED |NEW Ever Confirmed|0 |1 Last reconfirmed|0000-00-00 00:00:00 |2009-07-27 15:05:21 date| | http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40783