linux-kernel - [PATCH v2 1/2] crypto: s(h)aving 16 byte constant off arch/x86/crypto/sha1_ni

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Date: Mon, 8 Apr 2024 16:08:52 +0200
From: "Stefan Kanthak" <stefan.kanthak@...go.de>
To: <linux-kernel@...r.kernel.org>, <linux-crypto@...r.kernel.org>
Cc: <tim.c.chen@...ux.intel.com>, "Eric Biggers" <ebiggers@...nel.org>
Subject: [PATCH v2 1/2] crypto: s(h)aving 16 byte constant off arch/x86/crypto/sha1_ni_asm.S

Get rid of 16 byte constant, use shift instead of mask

--- -/arch/x86/crypto/sha1_ni_asm.S
+++ +/arch/x86/crypto/sha1_ni_asm.S
@@ -104,9 +104,9 @@
 	add		DATA_PTR, NUM_BLKS	/* pointer to end of data */
 
 	/* load initial hash values */
-	pinsrd		$3, 1*16(DIGEST_PTR), E0
+	pinsrd		$0, 1*16(DIGEST_PTR), E0
 	movdqu		0*16(DIGEST_PTR), ABCD
-	pand		UPPER_WORD_MASK(%rip), E0
+	pslldq		$12, E0
 	pshufd		$0x1B, ABCD, ABCD
 
 	movdqa		PSHUFFLE_BYTE_FLIP_MASK(%rip), SHUF_MASK
@@ -297,8 +297,3 @@
 .align 16
 PSHUFFLE_BYTE_FLIP_MASK:
 	.octa 0x000102030405060708090a0b0c0d0e0f
-
-.section	.rodata.cst16.UPPER_WORD_MASK, "aM", @progbits, 16
-.align 16
-UPPER_WORD_MASK:
-	.octa 0xFFFFFFFF000000000000000000000000