emit_move_insn (target, temp);
}
+void
+s390_expand_vec_movstr (rtx result, rtx dst, rtx src)
+{
+ int very_unlikely = REG_BR_PROB_BASE / 100 - 1;
+ rtx temp = gen_reg_rtx (Pmode);
+ rtx src_addr = XEXP (src, 0);
+ rtx dst_addr = XEXP (dst, 0);
+ rtx src_addr_reg = gen_reg_rtx (Pmode);
+ rtx dst_addr_reg = gen_reg_rtx (Pmode);
+ rtx offset = gen_reg_rtx (Pmode);
+ rtx vsrc = gen_reg_rtx (V16QImode);
+ rtx vpos = gen_reg_rtx (V16QImode);
+ rtx loadlen = gen_reg_rtx (SImode);
+ rtx gpos_qi = gen_reg_rtx(QImode);
+ rtx gpos = gen_reg_rtx (SImode);
+ rtx done_label = gen_label_rtx ();
+ rtx loop_label = gen_label_rtx ();
+ rtx exit_label = gen_label_rtx ();
+ rtx full_label = gen_label_rtx ();
+
+ /* Perform a quick check for string ending on the first up to 16
+ bytes and exit early if successful. */
+
+ emit_insn (gen_vlbb (vsrc, src, GEN_INT (6)));
+ emit_insn (gen_lcbb (loadlen, src_addr, GEN_INT (6)));
+ emit_insn (gen_vfenezv16qi (vpos, vsrc, vsrc));
+ emit_insn (gen_vec_extractv16qi (gpos_qi, vpos, GEN_INT (7)));
+ emit_move_insn (gpos, gen_rtx_SUBREG (SImode, gpos_qi, 0));
+ /* gpos is the byte index if a zero was found and 16 otherwise.
+ So if it is lower than the loaded bytes we have a hit. */
+ emit_cmp_and_jump_insns (gpos, loadlen, GE, NULL_RTX, SImode, 1,
+ full_label);
+ emit_insn (gen_vstlv16qi (vsrc, gpos, dst));
+
+ force_expand_binop (Pmode, add_optab, dst_addr, gpos, result,
+ 1, OPTAB_DIRECT);
+ emit_jump (exit_label);
+ emit_barrier ();
+
+ emit_label (full_label);
+ LABEL_NUSES (full_label) = 1;
+
+ /* Calculate `offset' so that src + offset points to the last byte
+ before 16 byte alignment. */
+
+ /* temp = src_addr & 0xf */
+ force_expand_binop (Pmode, and_optab, src_addr, GEN_INT (15), temp,
+ 1, OPTAB_DIRECT);
+
+ /* offset = 0xf - temp */
+ emit_move_insn (offset, GEN_INT (15));
+ force_expand_binop (Pmode, sub_optab, offset, temp, offset,
+ 1, OPTAB_DIRECT);
+
+ /* Store `offset' bytes in the dstination string. The quick check
+ has loaded at least `offset' bytes into vsrc. */
+
+ emit_insn (gen_vstlv16qi (vsrc, gen_lowpart (SImode, offset), dst));
+
+ /* Advance to the next byte to be loaded. */
+ force_expand_binop (Pmode, add_optab, offset, const1_rtx, offset,
+ 1, OPTAB_DIRECT);
+
+ /* Make sure the addresses are single regs which can be used as a
+ base. */
+ emit_move_insn (src_addr_reg, src_addr);
+ emit_move_insn (dst_addr_reg, dst_addr);
+
+ /* MAIN LOOP */
+
+ emit_label (loop_label);
+ LABEL_NUSES (loop_label) = 1;
+
+ emit_move_insn (vsrc,
+ gen_rtx_MEM (V16QImode,
+ gen_rtx_PLUS (Pmode, src_addr_reg, offset)));
+
+ emit_insn (gen_vec_vfenesv16qi (vpos, vsrc, vsrc,
+ GEN_INT (VSTRING_FLAG_ZS | VSTRING_FLAG_CS)));
+ add_int_reg_note (s390_emit_ccraw_jump (8, EQ, done_label),
+ REG_BR_PROB, very_unlikely);
+
+ emit_move_insn (gen_rtx_MEM (V16QImode,
+ gen_rtx_PLUS (Pmode, dst_addr_reg, offset)),
+ vsrc);
+ /* offset += 16 */
+ force_expand_binop (Pmode, add_optab, offset, GEN_INT (16),
+ offset, 1, OPTAB_DIRECT);
+
+ emit_jump (loop_label);
+ emit_barrier ();
+
+ /* REGULAR EXIT */
+
+ /* We are done. Add the offset of the zero character to the dst_addr
+ pointer to get the result. */
+
+ emit_label (done_label);
+ LABEL_NUSES (done_label) = 1;
+
+ force_expand_binop (Pmode, add_optab, dst_addr_reg, offset, dst_addr_reg,
+ 1, OPTAB_DIRECT);
+
+ emit_insn (gen_vec_extractv16qi (gpos_qi, vpos, GEN_INT (7)));
+ emit_move_insn (gpos, gen_rtx_SUBREG (SImode, gpos_qi, 0));
+
+ emit_insn (gen_vstlv16qi (vsrc, gpos, gen_rtx_MEM (BLKmode, dst_addr_reg)));
+
+ force_expand_binop (Pmode, add_optab, dst_addr_reg, gpos, result,
+ 1, OPTAB_DIRECT);
+
+ /* EARLY EXIT */
+
+ emit_label (exit_label);
+ LABEL_NUSES (exit_label) = 1;
+}
+
+
/* Expand conditional increment or decrement using alc/slb instructions.
Should generate code setting DST to either SRC or SRC + INCREMENT,
depending on the result of the comparison CMP_OP0 CMP_CODE CMP_OP1.
--- /dev/null
+/* The z13 stpcpy implementation plays some alignment tricks for good
+ performance. This test tries to make sure it works correctly and
+ does not access bytes beyond the source and destination
+ strings. */
+
+/* { dg-do run } */
+
+#include <stdio.h>
+#include <sys/mman.h>
+
+#define PAGE_SIZE 4096
+
+struct {
+ char unused[PAGE_SIZE - 32];
+ char m32[15]; /* page bndry - 32 */
+ char m17[1];
+ char m16[1];
+ char m15[14];
+ char m1[1];
+ char next_page[PAGE_SIZE];
+} s, d __attribute__((aligned(PAGE_SIZE)));
+
+char *__attribute__((noinline))
+my_stpcpy(char *dest, const char *src)
+{
+ return __builtin_stpcpy (dest, src);
+}
+
+void __attribute__ ((noinline))
+check (char *dest, char *src, size_t len)
+{
+ char *result;
+
+ result = my_stpcpy (dest, src);
+ if (result != dest + len)
+ __builtin_abort ();
+ if (__builtin_memcmp (src, dest, len) != 0)
+ __builtin_abort ();
+}
+
+int
+main ()
+{
+ char *src[5] = { s.m32, s.m17, s.m16, s.m15, s.m1 };
+ char *dst[5] = { d.m32, d.m17, d.m16, d.m15, d.m1 };
+ int len[8] = { 33, 32, 31, 17, 16, 15, 1, 0 };
+ int i, j, k;
+ char backup;
+
+ for (i = 0; i < sizeof (s); i++)
+ ((char*)&s)[i] = i % 26 + 97;
+
+ for (i = 0; i < 5; i++)
+ for (j = 0; j < 5; j++)
+ for (k = 0; k < 8; k++)
+ {
+ backup = src[j][len[k]];
+ src[j][len[k]] = 0;
+ __builtin_memset (&d, 0, sizeof (d));
+ check (dst[i], src[j], len[k]);
+ src[j][len[k]] = backup;
+ }
+
+ /* Make all source strings end before the page boundary. */
+ backup = s.m1[0];
+ s.m1[0] = 0;
+
+ if (mprotect (&s.next_page, PAGE_SIZE, PROT_NONE) == -1)
+ perror ("mprotect src");
+
+ for (i = 0; i < 5; i++)
+ for (j = 0; j < 5; j++)
+ check (dst[i], src[j],
+ PAGE_SIZE - ((unsigned long)src[j] & ((1UL << 12) - 1)) - 1);
+
+ if (mprotect (&s.next_page, PAGE_SIZE, PROT_READ | PROT_WRITE) == -1)
+ perror ("mprotect src");
+
+ s.m1[0] = backup;
+
+ if (mprotect (&d.next_page, PAGE_SIZE, PROT_NONE) == -1)
+ perror ("mprotect dst");
+
+ for (i = 0; i < 5; i++)
+ for (j = 0; j < 5; j++)
+ {
+ int len = PAGE_SIZE - ((unsigned long)dst[i] & ((1UL << 12) - 1)) - 1;
+ char backup = src[j][len];
+
+ src[j][len] = 0;
+ __builtin_memset (&d, 0,
+ (unsigned long)&d.next_page - (unsigned long)&d);
+ check (dst[i], src[j], len);
+ src[j][len] = backup;
+ }
+
+ return 0;
+}
projects / thirdparty / gcc.git / commitdiff
