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re PR target/78904 (zero-extracts are not effective) 

PR target/78904
	* config/i386/i386.md (*extvqi): Remove insn pattern.
	(divmodqi4): Update expander to generate QImode zero-extract from AH.

testsuite/ChangeLog:


	PR target/78904
	* gcc.target/i386/pr78904-6.c: New test.

From-SVN: r243968
This commit is contained in:
Uros Bizjak 2016-12-29 22:41:07 +01:00 committed by Uros Bizjak
parent 2ae2d394c1
commit a455baa994
4 changed files with 34 additions and 28 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2016-12-29 Uros Bizjak <ubizjak@gmail.com>
PR target/78904
* config/i386/i386.md (*extvqi): Remove insn pattern.
(divmodqi4): Update expander to generate QImode zero-extract from AH.
2016-12-29 Michael Meissner <meissner@linux.vnet.ibm.com>
* config/rs6000/rs6000.c (altivec_expand_builtin): Fix typos in

30
gcc/config/i386/i386.md
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@ -2780,33 +2780,6 @@
[(set_attr "type" "imovx")
(set_attr "mode" "SI")])
(define_insn "*extvqi"
[(set (match_operand:QI 0 "nonimmediate_operand" "=QBc,?R,m")
(sign_extract:QI (match_operand 1 "ext_register_operand" "Q,Q,Q")
(const_int 8)
(const_int 8)))]
""
{
switch (get_attr_type (insn))
{
case TYPE_IMOVX:
return "movs{bl|x}\t{%h1, %k0|%k0, %h1}";
default:
return "mov{b}\t{%h1, %0|%0, %h1}";
}
}
[(set_attr "isa" "*,*,nox64")
(set (attr "type")
(if_then_else (and (match_operand:QI 0 "register_operand")
(ior (not (match_operand:QI 0 "QIreg_operand"))
(match_test "TARGET_MOVX")))
(const_string "imovx")
(const_string "imov")))
(set (attr "mode")
(if_then_else (eq_attr "type" "imovx")
(const_string "SI")
(const_string "QI")))])
(define_expand "extzv<mode>"
[(set (match_operand:SWI248 0 "register_operand")
(zero_extract:SWI248 (match_operand:SWI248 1 "register_operand")
@ -7586,7 +7559,8 @@
emit_insn (gen_divmodhiqi3 (tmp0, tmp1, operands[2]));
/* Extract remainder from AH. */
tmp1 = gen_rtx_SIGN_EXTRACT (QImode, tmp0, GEN_INT (8), GEN_INT (8));
tmp1 = gen_rtx_ZERO_EXTRACT (SImode, tmp0, GEN_INT (8), GEN_INT (8));
tmp1 = gen_rtx_SUBREG (QImode, tmp1, 0);
rtx_insn *insn = emit_move_insn (operands[3], tmp1);
mod = gen_rtx_MOD (QImode, operands[1], operands[2]);

5
gcc/testsuite/ChangeLog
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@ -1,3 +1,8 @@
2016-12-29 Uros Bizjak <ubizjak@gmail.com>
PR target/78904
* gcc.target/i386/pr78904-6.c: New test.
2016-12-29 Jakub Jelinek <jakub@redhat.com>
* gcc.target/i386/mpx/memcpy-1.c: Include mpx-check.h.

21
gcc/testsuite/gcc.target/i386/pr78904-6.c Normal file
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@ -0,0 +1,21 @@
/* PR target/78904 */
/* { dg-do compile } */
/* { dg-options "-O2 -masm=att" } */
typedef __SIZE_TYPE__ size_t;
struct S1
{
char pad1;
char val;
short pad2;
};
extern char t[256];
void foo (struct S1 a, size_t i)
{
t[i] = a.val;
}
/* { dg-final { scan-assembler "\[ \t\]movb\[\t \]*%.h," } } */