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From: Adhemerval Zanella <azanella@sourceware.org> To: glibc-cvs@sourceware.org Subject: [glibc] s390: Use dl-symbol-redir-ifunc.h on cpu-tunables Date: Tue, 21 Nov 2023 20:49:17 +0000 (GMT) [thread overview] Message-ID: <20231121204917.597823858CD1@sourceware.org> (raw) https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=1c87f71a36e21fa851117c151b3c492fa3eede5b commit 1c87f71a36e21fa851117c151b3c492fa3eede5b Author: Adhemerval Zanella <adhemerval.zanella@linaro.org> Date: Mon Nov 6 17:25:43 2023 -0300 s390: Use dl-symbol-redir-ifunc.h on cpu-tunables Using the memcmp symbol directly allows the compile to inline the memcmp calls (especially because _dl_tunable_set_hwcaps uses constants values), generating better code. Checked with tst-tunables on s390x-linux-gnu (qemu system). Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org> Diff: --- sysdeps/s390/cpu-features.c | 30 +++++++++++++------------- sysdeps/s390/multiarch/dl-symbol-redir-ifunc.h | 2 ++ 2 files changed, 17 insertions(+), 15 deletions(-) diff --git a/sysdeps/s390/cpu-features.c b/sysdeps/s390/cpu-features.c index 39f8c23a60..55449ba07f 100644 --- a/sysdeps/s390/cpu-features.c +++ b/sysdeps/s390/cpu-features.c @@ -21,7 +21,7 @@ #include <elf/dl-tunables.h> #include <ifunc-memcmp.h> #include <string.h> -extern __typeof (memcmp) MEMCMP_DEFAULT; +#include <dl-symbol-redir-ifunc.h> #define S390_COPY_CPU_FEATURES(SRC_PTR, DEST_PTR) \ (DEST_PTR)->hwcap = (SRC_PTR)->hwcap; \ @@ -89,9 +89,9 @@ TUNABLE_CALLBACK (set_hwcaps) (tunable_val_t *valp) if ((*feature == 'z' || *feature == 'a')) { if ((feature_len == 5 && *feature == 'z' - && MEMCMP_DEFAULT (feature, "zEC12", 5) == 0) + && memcmp (feature, "zEC12", 5) == 0) || (feature_len == 6 && *feature == 'a' - && MEMCMP_DEFAULT (feature, "arch10", 6) == 0)) + && memcmp (feature, "arch10", 6) == 0)) { reset_features = true; disable = true; @@ -100,9 +100,9 @@ TUNABLE_CALLBACK (set_hwcaps) (tunable_val_t *valp) stfle_bits0_mask = S390_STFLE_MASK_ARCH13_MIE3; } else if ((feature_len == 3 && *feature == 'z' - && MEMCMP_DEFAULT (feature, "z13", 3) == 0) + && memcmp (feature, "z13", 3) == 0) || (feature_len == 6 && *feature == 'a' - && MEMCMP_DEFAULT (feature, "arch11", 6) == 0)) + && memcmp (feature, "arch11", 6) == 0)) { reset_features = true; disable = true; @@ -110,9 +110,9 @@ TUNABLE_CALLBACK (set_hwcaps) (tunable_val_t *valp) stfle_bits0_mask = S390_STFLE_MASK_ARCH13_MIE3; } else if ((feature_len == 3 && *feature == 'z' - && MEMCMP_DEFAULT (feature, "z14", 3) == 0) + && memcmp (feature, "z14", 3) == 0) || (feature_len == 6 && *feature == 'a' - && MEMCMP_DEFAULT (feature, "arch12", 6) == 0)) + && memcmp (feature, "arch12", 6) == 0)) { reset_features = true; disable = true; @@ -120,11 +120,11 @@ TUNABLE_CALLBACK (set_hwcaps) (tunable_val_t *valp) stfle_bits0_mask = S390_STFLE_MASK_ARCH13_MIE3; } else if ((feature_len == 3 && *feature == 'z' - && (MEMCMP_DEFAULT (feature, "z15", 3) == 0 - || MEMCMP_DEFAULT (feature, "z16", 3) == 0)) + && (memcmp (feature, "z15", 3) == 0 + || memcmp (feature, "z16", 3) == 0)) || (feature_len == 6 - && (MEMCMP_DEFAULT (feature, "arch13", 6) == 0 - || MEMCMP_DEFAULT (feature, "arch14", 6) == 0))) + && (memcmp (feature, "arch13", 6) == 0 + || memcmp (feature, "arch14", 6) == 0))) { /* For z15 or newer we don't have to disable something, but we have to reset to the original values. */ @@ -134,14 +134,14 @@ TUNABLE_CALLBACK (set_hwcaps) (tunable_val_t *valp) else if (*feature == 'H') { if (feature_len == 15 - && MEMCMP_DEFAULT (feature, "HWCAP_S390_VXRS", 15) == 0) + && memcmp (feature, "HWCAP_S390_VXRS", 15) == 0) { hwcap_mask = HWCAP_S390_VXRS; if (disable) hwcap_mask |= HWCAP_S390_VXRS_EXT | HWCAP_S390_VXRS_EXT2; } else if (feature_len == 19 - && MEMCMP_DEFAULT (feature, "HWCAP_S390_VXRS_EXT", 19) == 0) + && memcmp (feature, "HWCAP_S390_VXRS_EXT", 19) == 0) { hwcap_mask = HWCAP_S390_VXRS_EXT; if (disable) @@ -150,7 +150,7 @@ TUNABLE_CALLBACK (set_hwcaps) (tunable_val_t *valp) hwcap_mask |= HWCAP_S390_VXRS; } else if (feature_len == 20 - && MEMCMP_DEFAULT (feature, "HWCAP_S390_VXRS_EXT2", 20) == 0) + && memcmp (feature, "HWCAP_S390_VXRS_EXT2", 20) == 0) { hwcap_mask = HWCAP_S390_VXRS_EXT2; if (!disable) @@ -160,7 +160,7 @@ TUNABLE_CALLBACK (set_hwcaps) (tunable_val_t *valp) else if (*feature == 'S') { if (feature_len == 10 - && MEMCMP_DEFAULT (feature, "STFLE_MIE3", 10) == 0) + && memcmp (feature, "STFLE_MIE3", 10) == 0) { stfle_bits0_mask = S390_STFLE_MASK_ARCH13_MIE3; } diff --git a/sysdeps/s390/multiarch/dl-symbol-redir-ifunc.h b/sysdeps/s390/multiarch/dl-symbol-redir-ifunc.h index aa084fdcde..0f58897c48 100644 --- a/sysdeps/s390/multiarch/dl-symbol-redir-ifunc.h +++ b/sysdeps/s390/multiarch/dl-symbol-redir-ifunc.h @@ -20,10 +20,12 @@ #define _DL_IFUNC_GENERIC_H #include <ifunc-memset.h> +#include <ifunc-memcmp.h> #define IFUNC_SYMBOL_STR1(s) #s #define IFUNC_SYMBOL_STR(s) IFUNC_SYMBOL_STR1(s) asm ("memset = " IFUNC_SYMBOL_STR(MEMSET_DEFAULT)); +asm ("memcmp = " IFUNC_SYMBOL_STR(MEMCMP_DEFAULT)); #endif
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