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 ...
In the latest branch arc-2024.06, an anomaly has been detected in a test case builtin-arith-overflow-12.c across multiple configurations — archs, em, em4_fpuda, arcem, and more. Below is a simplified test case along with the execution st...
We don't really support _Complex _BitInt(N), the only place we use 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 ...
[Bug rtl-optimization/115369] New: ifcvt failed to condition elimination for__builtin_mul_overflow https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115369
__builtin{add,sub}c [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) ...
[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...
[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/...
01 2024 +0200 builtins: 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 ...
builtins: Force SAVE_EXPR for __builtin_{add,sub,mul}_overflow and __builtin{add,sub}c [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 ...