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authorMax Filippov <jcmvbkbc@gmail.com>2019-05-10 14:48:14 (GMT)
committerWaldemar Brodkorb <wbx@openadk.org>2019-05-13 07:11:01 (GMT)
commitb56bd489812c685819bdec6d83f7990f21473be8 (patch)
treee6baa632fd87a5a6ab464e64e3b53a4b13673d5c
parent30b85d43a7657eeac02462e8d84946358a5aa647 (diff)
xtensa: don't use l32r opcode explicitly
xtensa assembler is capable of representing register loads with either movi + addmi, l32r or const16, depending on the core configuration. Don't use '.literal' and 'l32r' directly in the code, use 'movi' and let the assembler relax them. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
-rw-r--r--libc/string/xtensa/strcmp.S17
1 files changed, 5 insertions, 12 deletions
diff --git a/libc/string/xtensa/strcmp.S b/libc/string/xtensa/strcmp.S
index a16da5d..a106bee 100644
--- a/libc/string/xtensa/strcmp.S
+++ b/libc/string/xtensa/strcmp.S
@@ -37,11 +37,6 @@
.text
.align 4
.literal_position
- .literal .Lmask0, MASK0
- .literal .Lmask1, MASK1
- .literal .Lmask2, MASK2
- .literal .Lmask3, MASK3
- .literal .Lmask4, MASK4
ENTRY (strcmp)
/* a2 = s1, a3 = s2 */
@@ -130,10 +125,9 @@ ENTRY (strcmp)
.align 4
#if XCHAL_HAVE_LOOPS
.Laligned:
- .begin no-transform
movi a11, 0
- l32r a4, .Lmask0 /* mask for byte 0 */
- l32r a7, .Lmask4
+ movi a4, MASK0 /* mask for byte 0 */
+ movi a7, MASK4
loop a11, .Laligned_done /* Loop forever. */
/* First unrolled loop body. */
@@ -184,10 +178,10 @@ ENTRY (strcmp)
If not, loop over the rest of string using normal algorithm. */
bnone a8, a4, .Leq /* if byte 0 is zero */
- l32r a5, .Lmask1 /* mask for byte 1 */
- l32r a6, .Lmask2 /* mask for byte 2 */
+ movi a5, MASK1 /* mask for byte 1 */
+ movi a6, MASK2 /* mask for byte 2 */
bnone a8, a5, .Leq /* if byte 1 is zero */
- l32r a7, .Lmask3 /* mask for byte 3 */
+ movi a7, MASK3 /* mask for byte 3 */
bnone a8, a6, .Leq /* if byte 2 is zero */
bnone a8, a7, .Leq /* if byte 3 is zero */
addi.n a2, a2, 4 /* advance s1 pointer */
@@ -196,7 +190,6 @@ ENTRY (strcmp)
/* align (1 mod 4) */
loop a11, .Leq /* loop forever */
- .end no-transform
l32i a8, a2, 0 /* get word from s1 */
l32i a9, a3, 0 /* get word from s2 */