arch/parisc/lib/ucmpdi2.c

Source file repositories/reference/linux-study-clean/arch/parisc/lib/ucmpdi2.c

File Facts

System
Linux kernel
Corpus path
arch/parisc/lib/ucmpdi2.c
Extension
.c
Size
516 bytes
Lines
28
Domain
Architecture Layer
Bucket
arch/parisc
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0
#include <linux/module.h>
#include <linux/libgcc.h>

union ull_union {
	unsigned long long ull;
	struct {
		unsigned int high;
		unsigned int low;
	} ui;
};

word_type __ucmpdi2(unsigned long long a, unsigned long long b)
{
	union ull_union au = {.ull = a};
	union ull_union bu = {.ull = b};

	if (au.ui.high < bu.ui.high)
		return 0;
	else if (au.ui.high > bu.ui.high)
		return 2;
	if (au.ui.low < bu.ui.low)
		return 0;
	else if (au.ui.low > bu.ui.low)
		return 2;
	return 1;
}

Annotation

Implementation Notes