[Bug target/47324] r157762 caused g++.dg/torture/stackalign failures with -O3 -g at -m32 on darwin

[howarth at nitro dot med.uc.edu]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47324

--- Comment #18 from Jack Howarth <howarth at nitro dot med.uc.edu> 2011-02-09 02:03:46 UTC ---
It may be...

--- trunk/gcc/dwarf2out.c    2010/03/26 19:21:13    157761
+++ trunk/gcc/dwarf2out.c    2010/03/26 20:53:58    157762
@@ -1115,8 +1115,8 @@
       && sreg == INVALID_REGNUM)
     {
       cfi->dw_cfi_opc = DW_CFA_expression;
-      cfi->dw_cfi_oprnd2.dw_cfi_reg_num = reg;
-      cfi->dw_cfi_oprnd1.dw_cfi_loc
+      cfi->dw_cfi_oprnd1.dw_cfi_reg_num = reg;
+      cfi->dw_cfi_oprnd2.dw_cfi_loc
     = build_cfa_aligned_loc (offset, fde->stack_realignment);
     }
   else if (sreg == INVALID_REGNUM)

a cursory examination of dwarf2out.c shows that the calls of
DWARF2_FRAME_REG_OUT are related to either dw_cfi_oprnd1 or dw_cfi_oprnd2
depending on the location. I don't see changes associated to r157762 making
sure that the existing DWARF2_FRAME_REG_OUT calls were corrected for the
reversal of the operands.