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Re: For anyone who cares: gcc compile oddity
Am 25.10.2017 um 15:24 schrieb Matt Sporleder:
On Oct 25, 2017, at 3:30 AM, Robert Elz <kre%munnari.OZ.AU@localhost> wrote:
I was watching a build of netbsd-7 scroll past (it cam be amusing
watching gcc printing warnings about code in gcc...) when I saw this
one fly past.
To me this looks like it might indicate a real error, rather than
just typical gcc noise.
If anyone cares, here is the warning (the build continued happily).
(All of this is from a netbsd-7 checkout that is, I believe, up to date.)
/local/netbsd/src-7/tools/gcc/../../external/gpl3/gcc/dist/gcc/config/i386/i386.c: In function 'bool ix86_rtx_costs(rtx, int, int, int, int*, bool)':
/local/netbsd/src-7/tools/gcc/../../external/gpl3/gcc/dist/gcc/config/i386/i386.c:34183:24: warning: logical not is only applied to the left hand side of comparison [-Wlogical-not-parentheses]
|| (!GET_CODE (x) != LABEL_REF
/local/netbsd/src-7/tools/gcc/../../external/gpl3/gcc/dist/gcc/config/i386/i386.c:34183:24: warning: comparison of constant '45' with boolean expression is always true [-Wbool-compare]
Or Not Does Not Equal would confuse me to say the least.
Maybe the left-hand ! also covers the case where GET_CODE(x) is an error/null?
I think it is this patch from gcc.
--- trunk/gcc/config/i386/i386.c 2014/05/24 22:00:14 210901
+++ trunk/gcc/config/i386/i386.c 2014/05/26 17:33:09 210937
@@ -37903,10 +37903,10 @@
else if (TARGET_64BIT && !x86_64_zext_immediate_operand (x,
*total = 2;
else if (flag_pic && SYMBOLIC_CONST (x)
- && (!TARGET_64BIT
- || (!GET_CODE (x) != LABEL_REF
- && (GET_CODE (x) != SYMBOL_REF
- || !SYMBOL_REF_LOCAL_P (x)))))
+ && !(TARGET_64BIT
+ && (GET_CODE (x) == LABEL_REF
+ || (GET_CODE (x) == SYMBOL_REF
+ && SYMBOL_REF_LOCAL_P (x)))))
*total = 1;
*total = 0;
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