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Re: Darwin -m64 results
- From: howarth at bromo dot msbb dot uc dot edu (Jack Howarth)
- To: mrs at apple dot com
- Cc: fortran at gcc dot gnu dot org, fxcoudert at gmail dot com, gcc at gcc dot gnu dot org, gkeating at apple dot com, howarth at bromo dot msbb dot uc dot edu
- Date: Sat, 19 Aug 2006 10:58:39 -0400 (EDT)
- Subject: Re: Darwin -m64 results
Mike,
One other observation. The only differences in the .s
output for compiling...
program test
integer i
common i
end
...with -m32 and -m64 is...
--- assign_m32.s 2006-08-19 10:53:33.000000000 -0400
+++ assign_m64.s 2006-08-19 10:53:59.000000000 -0400
@@ -1,10 +1,11 @@
- .machine ppc
+ .machine ppc64
.stabs "/Users/howarth/",100,0,7,Ltext0
.stabs "assign.f90",100,0,7,Ltext0
.text
Ltext0:
.stabs "gcc2_compiled.",60,0,0,0
.align 2
+ .p2align 4,,15
.globl _MAIN__
_MAIN__:
.stabd 68,0,3
@@ -35,11 +36,11 @@
mflr r11
addis r11,r11,ha16(L__gfortran_set_std$lazy_ptr-"L00000000001$spb")
mtlr r0
- lwzu r12,lo16(L__gfortran_set_std$lazy_ptr-"L00000000001$spb")(r11)
+ ldu r12,lo16(L__gfortran_set_std$lazy_ptr-"L00000000001$spb")(r11)
mtctr r12
bctr
.lazy_symbol_pointer
L__gfortran_set_std$lazy_ptr:
.indirect_symbol __gfortran_set_std
- .long dyld_stub_binding_helper
+ .quad dyld_stub_binding_helper
.subsections_via_symbols
...so even if "i" were being optimized away only ld64 seems to care.
The ld 32-bit linker remains silent on the issue.
Jack