https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78197
Bug ID: 78197
Summary: Stack layout strangeness on AIX and Power
Product: gcc
Version: 7.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: vogt at linux dot vnet.ibm.com
CC: dje at gcc dot gnu.org
Target Milestone: ---
Target: AIX, Power
The file rs6000.h contains the macros
--
#define STACK_BOUNDARY \
((TARGET_32BIT && !TARGET_ALTIVEC && !TARGET_ALTIVEC_ABI && !TARGET_VSX) \
? 64 : 128)
#define STARTING_FRAME_OFFSET \
(FRAME_GROWS_DOWNWARD \
? 0 \
: (RS6000_ALIGN (crtl->outgoing_args_size, \
(TARGET_ALTIVEC || TARGET_VSX) ? 16 : 8) \
+ RS6000_SAVE_AREA))
#define STACK_DYNAMIC_OFFSET(FUNDECL) \
(RS6000_ALIGN (crtl->outgoing_args_size, \
(TARGET_ALTIVEC || TARGET_VSX) ? 16 : 8) \
+ (STACK_POINTER_OFFSET))
--
Does STACK_BOUNDARY use a different conditions to decide betweeen 8 and 16 byte
alignment than the other two macros? In aix.h, STACK_BOUNDARY is hard coded to
128, so at least on AIX these conditions seem to be broken.
