tools/testing/selftests/powerpc/math/mma.S

File Facts

System

Linux kernel

Corpus path

tools/testing/selftests/powerpc/math/mma.S

Extension

.S

Size

761 bytes

Lines

37

Domain

Support Tooling And Documentation

Bucket

tools

Inferred role

Support Tooling And Documentation: tools

Status

atlas-only

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

• Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

• No C-style include directives detected by the generator.

Detected Declarations

• No top-level syscall, struct, function, initcall, or export declaration detected by the generator.

Annotated Snippet

.global test_mma
test_mma:
	/* Load accumulator via VSX registers from image passed in r3 */
	lxvh8x	4,0,3
	lxvh8x	5,0,4

	/* Clear and prime the accumulator (xxsetaccz) */
	.long	0x7c030162

	/* Prime the accumulator with MMA VSX move to accumulator
	* X-form (xxmtacc) (not needed due to above zeroing) */
	//.long 0x7c010162

	/* xvi16ger2s */
	.long	0xec042958

	/* Deprime the accumulator - xxmfacc 0 */
	.long 0x7c000162

	/* Store result in image passed in r5 */
	stxvw4x	0,0,5
	addi	5,5,16
	stxvw4x	1,0,5
	addi	5,5,16
	stxvw4x	2,0,5
	addi	5,5,16
	stxvw4x	3,0,5
	addi	5,5,16

	blr

Annotation

• Atlas domain: Support Tooling And Documentation / tools.
• Implementation status: atlas-only.

Implementation Notes

• This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
• Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
• Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.