6/28/2013 · The important information in the message is the text…order of volatile accesses is undefined… That is, the IAR C/C++ Compiler will (because it follows the ISO/ANSI standard) access the variables in an order that is not defined.
2/28/2018 · The message below is issued if 2 (or more) of the variables in a C statement are volatile. Warning[Pa082]: undefined behavior: the order of volatile accesses is undefined in this statement. The central information the message is the text …order of volatile accesses is undefined… . That is, IAR C/C++ Compiler will (as it follows the ISO/ANSI standard) access the variables in an order that is not.
7/13/2007 · Mon Jul 09, 2007 12:56 am. Hi, I cannot get rid of this warning, although I suspect the solution is quite easy : warning: undefined behavior: the order of volatile accesses is undefined in this statement. and happens in this code snippet for instance :, Warning[…]: undefined behavior: the order of volatile accesses is undefined in this statement x.cpp xxx. Why this line is undefined behavior? case 2: Vdda = 3.3 * (*VREFINT_CAL) / ADC_DR->DATA Where the declarations/initializations are: volatile short const *VREFINT_CAL =.
12/18/2015 · Recompiling the code verifies that indeed the warning of ” undefined behavior: the order of volatile accesses is undefined in this statement” is no longer an issue. Solving the mystery of the warning required a little bit of extra work but in the end we have an application that consists of only defined behavior and the potential for one less bug that can come back and bite us later.
11/17/2004 · I am using a piece of code from one of Atmel’s app notes on using an external input to clock a timer to measure frequency (Doc8365). Seems to work fine, but I get a compiler warning (IAR) for Undefined behavior: the order of volatile accesses is undefined in this statement for the following line: llFrequency = FREQ_CNTR_COUNT_LOW + …
nrf_drv_twi.c – many warnings about the order of volatile accesses is undefined . C0oo1D over 5 years ago. Warning [Pa082]: undefined behavior: the order of volatile accesses is undefined in this statement C:Projects..libnrf_drv_twi.c 273. 21 the same warnings.
static volatile int x[2] = {1, 2} int test(){ return x[0]+x[1] } Warning[Pa082]: undefined behavior: the order of volatile accesses is undefined in this statement C:sandboxtest.c 32. The compiler tech note provides an explanation which boils down to two side effects (volatile accesses) being unsequenced.
11/15/2019 · jwestmoreland wrote on Tuesday, May 09, 2006: Richard, Warning[Pa082]: undefined behavior: the order of volatile accesses is undefined in this statement C:…Sourcetasks.c 710 My line 710: vListInsert( ( xList * ) pxOverflowDelayedTaskList, ( xListItem * ) &( pxCurrentTCB->xGenericListItem ) ) I have 8 more similar Warning messages in the tasks.c module – all list stuff.
8/11/2004 · volatiles, both have to be read in order to do the comparison and one or the other will be read first. However, one or both values could change after reading the first and before reading the second. The compiler is warning the order in which they are read can have an impact upon the results of the comparison and the order is undefined . Regards-Bill Knight
