In C99 signed shift (1 << 31) is undefined behavior, since the result exceeds INT_MAX. Use 1U instead and move the shift after the check.
Signed-off-by: Xi Wang <xi.w...@gmail.com> Acked-by: Jia Liu <pro...@gmail.com> --- hw/openrisc/pic_cpu.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/hw/openrisc/pic_cpu.c b/hw/openrisc/pic_cpu.c index 3fcee02..2af1d60 100644 --- a/hw/openrisc/pic_cpu.c +++ b/hw/openrisc/pic_cpu.c @@ -26,12 +26,14 @@ static void openrisc_pic_cpu_handler(void *opaque, int irq, int level) { OpenRISCCPU *cpu = (OpenRISCCPU *)opaque; CPUState *cs = CPU(cpu); - uint32_t irq_bit = 1 << irq; + uint32_t irq_bit; if (irq > 31 || irq < 0) { return; } + irq_bit = 1U << irq; + if (level) { cpu->env.picsr |= irq_bit; } else { -- 1.7.12.4 (Apple Git-37)