Build error with 'do while' loop on release optimization level (IDFGH-324)

[laszlopataki]

Environment

• Development Kit: none
• IDF version: //020ade65
• Development Env: Make
• Operating System: Windows

Problem Description

The following error message is returned when I was using a 'do while' loop and have put an array in the test expression.
The problem only exists if I compile on release optimization level.

$ make
...
CC build/main/loop_failure_main.o
C:\msys32\tmp\ccfLtEqO.s: Assembler messages:
C:\msys32\tmp\ccfLtEqO.s:59: Error: unknown opcode or format name 'lsiu'
make[1]: *** [.../esp/esp-idf/make/component_wrapper.mk:286: loop_failure_main.o] Error 1
make: *** [.../esp/esp-idf/make/project.mk:472: component-main-build] Error 2

Expected Behavior

The project successfully builds.

Actual Behavior

The assembler returns error.

Steps to repropduce

1. Copy the code snippet into an empty project
2. Set the optimization level to release.
3. Build with make

Code to reproduce this issue

#include <stdio.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "esp_system.h"
#include "esp_spi_flash.h"


void app_main()
{
	uint8_t i = 0;
	float sum = 0.0f;
	float samples[64] = {1.0, 2.0, 3.0, 4.0, 5.0};
	do{
		sum += samples[i];
		i++;
		printf("Loop\n");
	}while (i < 64 && samples[i] != 0);
    //It works with while() loop or without the 'samples[i] != 0' expression.
}

[igrr]

Preview release of the toolchain which fixes this issue is now available, see https://www.esp32.com/viewtopic.php?f=10&t=7400&p=31257#p41667.