When compiling guality/vla-1.c with -O3 -g, vla a in f1 is optimized away, but f1 still contains a debug expression describing the upper bound of the vla (D.1914): ... __attribute__((noinline)) f1 (intD.6 iD.1900) { <bb 2> saved_stack.1_2 = __builtin_stack_save (); # DEBUG BEGIN_STMT # DEBUG D#3 => i_1(D) + 1 # DEBUG D#2 => (long intD.8) D#3 # DEBUG D#1 => D#2 + -1 # DEBUG D.1914 => (sizetype) D#1 ... Then f1 is cloned to a version f1.constprop with no parameters, eliminating parameter i, and 'DEBUG D#3 => i_1(D) + 1' turns into 'D#3 => NULL'. This patch fixes that by defining debug expressions for default defs of eliminated parameters in remap_ssa_name: ... __attribute__((noinline)) f1.constprop () { intD.6 iD.1949; <bb 3> # DEBUG D#8 s=> iD.1900 # DEBUG iD.1949 => D#8 <bb 2> + # DEBUG D#6 s=> iD.1949 saved_stack.1_1 = __builtin_stack_save (); # DEBUG BEGIN_STMT - # DEBUG D#3 => NULL + # DEBUG D#3 => D#6 + 1 # DEBUG D#2 => (long intD.8) D#3 # DEBUG D#1 => D#2 + -1 # DEBUG D.1951 => (sizetype) D#1 ... Bootstrapped and reg-tested on x86_64. 2018-07-09 Tom de Vries <tdevries@suse.de> * cfgexpand.c (expand_debug_source_expr): Handle VAR_DECL. * tree-inline.c (remap_ssa_name): Handle default def ssa_name mapping onto VAR_DECL with abstract origin. * gcc.dg/vla-1.c: New test. From-SVN: r262510
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