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re PR target/88425 (suboptimal code for a<imm?-1:0)

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PR target/88425
	* config/i386/i386.md (*x86_mov<SWI48:mode>cc_0_m1_neg_leu<SWI:mode>):
	New define_insn_and_split.

	* gcc.target/i386/pr88425.c: New test.

From-SVN: r267023
This commit is contained in:
Jakub Jelinek 2018-12-11 15:50:22 +01:00 committed by Jakub Jelinek
parent 6d9391732b
commit 61d1d9a664
4 changed files with 80 additions and 0 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2018-12-11 Jakub Jelinek <jakub@redhat.com>
PR target/88425
* config/i386/i386.md (*x86_mov<SWI48:mode>cc_0_m1_neg_leu<SWI:mode>):
New define_insn_and_split.
2018-12-11 Richard Biener <rguenther@suse.de>
PR middle-end/88448

18
gcc/config/i386/i386.md
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@ -17195,6 +17195,24 @@
(set_attr "mode" "<MODE>")
(set_attr "length_immediate" "0")])
(define_insn_and_split "*x86_mov<SWI48:mode>cc_0_m1_neg_leu<SWI:mode>"
[(set (match_operand:SWI48 0 "register_operand" "=r")
(neg:SWI48
(leu:SWI48
(match_operand:SWI 1 "nonimmediate_operand" "<SWI:r>m")
(match_operand:SWI 2 "<SWI:immediate_operand>" "<SWI:i>"))))
(clobber (reg:CC FLAGS_REG))]
"CONST_INT_P (operands[2])
&& INTVAL (operands[2]) != -1
&& INTVAL (operands[2]) != 2147483647"
"#"
""
[(set (reg:CC FLAGS_REG) (compare:CC (match_dup 1) (match_dup 2)))
(parallel [(set (match_dup 0)
(neg:SWI48 (ltu:SWI48 (reg:CC FLAGS_REG) (const_int 0))))
(clobber (reg:CC FLAGS_REG))])]
"operands[2] = GEN_INT (INTVAL (operands[2]) + 1);")
(define_insn "*mov<mode>cc_noc"
[(set (match_operand:SWI248 0 "register_operand" "=r,r")
(if_then_else:SWI248 (match_operator 1 "ix86_comparison_operator"

3
gcc/testsuite/ChangeLog
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@ -1,5 +1,8 @@
2018-12-11 Jakub Jelinek <jakub@redhat.com>
PR target/88425
* gcc.target/i386/pr88425.c: New test.
PR sanitizer/88426
* c-c++-common/ubsan/float-cast-overflow-11.c: New test.

53
gcc/testsuite/gcc.target/i386/pr88425.c Normal file
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@ -0,0 +1,53 @@
/* PR target/88425 */
/* { dg-do compile } */
/* { dg-options "-O2 -masm=att" } */
/* { dg-final { scan-assembler-times "sbb\[lq]\[ \t]" 8 } } */
/* { dg-final { scan-assembler-not "setbe\[ \t]" } } */
unsigned long
f1 (unsigned long x)
{
return x < 123UL ? -1UL : 0;
}
unsigned long
f2 (unsigned int x)
{
return x < 12345U ? -1UL : 0;
}
unsigned long
f3 (unsigned short *x)
{
return x[0] < 1234U ? -1UL : 0;
}
unsigned long
f4 (unsigned char *x)
{
return x[0] < 123U ? -1UL : 0;
}
unsigned int
f5 (unsigned long x)
{
return x < 123UL ? -1U : 0;
}
unsigned int
f6 (unsigned int x)
{
return x < 12345U ? -1U : 0;
}
unsigned int
f7 (unsigned short *x)
{
return x[0] < 1234U ? -1U : 0;
}
unsigned int
f8 (unsigned char *x)
{
return x[0] < 123U ? -1U : 0;
}