是的,你提到的__builtin_mul_overflow()函数是GCC和Clang编译器中提供的内建函数,用于判断两个整数相乘是否会导致溢出。 这个函数的使用方式如下: #include<stdio.h> intmain(){ intnum1=123456789; intnum2=987654321; intresult; if(__builtin_mul_overflow(num1,num2,&result)){ printf("Multiplication ...
__builtin_mul_overflow #630 Closed luismgsilva opened this issue Jun 28, 2024· 2 comments Comments Member luismgsilva commented Jun 28, 2024 • edited In the latest branch arc-2024.06, an anomaly has been detected in a test case builtin-arith-overflow-12.c across multiple ...
[Bug rtl-optimization/115369] New: ifcvt failed to condition elimination for__builtin_mul_overflow https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115369
* overflows. This needs to be fixed. */ #define __builtin_add_overflow(a, b, output) \ ({ *output = (a) + (b); false; }) #define __builtin_mul_overflow(a, b, output) \ ({ *output = (a) * (b); false; }) #define __builtin_umul_overflow(a, b, output) \ ({ ...
bitint complex types is for the .{ADD,SUB,MUL}_OVERFLOW internal function results and COMPLEX_EXPR in the usual case should be either not present yet because the ifns weren't folded and will be lowered, or optimized into something simpler, because normally the complex bitint should be ...
Index of Descriptions for Built-in Functions and Top-level Commands Description • The following are the names of standard library functions and top-level commands which are built-in, that is implemented directly in the Maple kernel. For more information, click the corresponding hyperlink, ...
on the .{ADD,SUB,MUL}_OVERFLOW call we are creating, but if the first two operands are not INTEGER_CSTs (in that case we just fold it right away) but are TREE_READONLY/!TREE_SIDE_EFFECTS, save_expr doesn't actually create a SAVE_EXPR at all and so we lower it to ...
Force SAVE_EXPR for __builtin_{add,sub,mul}_overflow [PR108789] The following testcase is miscompiled, because we use save_expr on the .{ADD,SUB,MUL}_OVERFLOW call we are creating, but if the first two operands are not INTEGER_CSTs (in that case we just fold it right away) but ...
[Bug middle-end/108789] __builtin_(add|mul|sub)_overflow methods generate duplicate operations if both operands are const which in turn causes wrong code due to overlapping arguments jakub at gcc dot gnu.org via Gcc-bugs Tue, 04 Jun 2024 03:33:22 -0700 https://gcc.gnu.org/bugzilla/...
[Bug middle-end/108789] __builtin_(add|mul|sub)_overflow methods generate duplicate operations if both operands are const which in turn causes wrong code due to overlapping arguments pinskia at gcc dot gnu.org via Gcc-bugs Mon, 03 Jun 2024 06:59:07 -0700 https://gcc.gnu.org/bugzilla...