http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55019
Bug #: 55019
Summary: Incorrectly use live argument register to save high
register in thumb1 prologue
Classification: Unclassified
Product: gcc
Version: 4.7.3
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
AssignedTo: unassig...@gcc.gnu.org
ReportedBy: terry....@arm.com
When run 4.7 regression test on cortex-m0 with options "-mthumb -mcpu=cortex-m0
-O1 -funroll-loops", case gcc.dg/torture/builtin-complex-1.c will fail due to
the corruption of argument register as shown in below:
compare:
push {r3, r4, r6, lr}
mov r6, fp
mov r4, sl
mov r3, r9 <<-- r3 is clobbered
push {r3, r4, r6}
mov r6, r8
push {r6}
mov fp, r0
mov sl, r1
mov r9, r2
mov r8, r3 <<-- wrong value is used
