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re PR target/20196 (Miscompilation of mem_init in 32-bit ppc linux kernel) 

PR target/20196
	* config/rs6000/rs6000.md (LTU, GTU sCC splitters): Add earlyclobber,
	allow splitting only if operands 0 and 3 don't overlap.

	* gcc.c-torture/execute/20050224-1.c: New test.

From-SVN: r95513
This commit is contained in:
Jakub Jelinek 2005-02-24 22:23:14 +01:00 committed by Jakub Jelinek
parent 6ecfe13b3e
commit 04fa46cf67
4 changed files with 50 additions and 8 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2005-02-24 Jakub Jelinek <jakub@redhat.com>
PR target/20196
* config/rs6000/rs6000.md (LTU, GTU sCC splitters): Add earlyclobber,
allow splitting only if operands 0 and 3 don't overlap.
2005-02-24 Richard Henderson <rth@redhat.com>
PR middle-end/19953

16
gcc/config/rs6000/rs6000.md
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@ -12670,25 +12670,25 @@
"")
(define_insn_and_split ""
[(set (match_operand:SI 0 "gpc_reg_operand" "=r,r")
[(set (match_operand:SI 0 "gpc_reg_operand" "=&r,r")
(plus:SI (ltu:SI (match_operand:SI 1 "gpc_reg_operand" "r,r")
(match_operand:SI 2 "reg_or_neg_short_operand" "r,P"))
(match_operand:SI 3 "reg_or_short_operand" "rI,rI")))]
"TARGET_32BIT"
"#"
"TARGET_32BIT"
"&& !reg_overlap_mentioned_p (operands[0], operands[3])"
[(set (match_dup 0) (neg:SI (ltu:SI (match_dup 1) (match_dup 2))))
(set (match_dup 0) (minus:SI (match_dup 3) (match_dup 0)))]
"")
(define_insn_and_split ""
[(set (match_operand:DI 0 "gpc_reg_operand" "=r,r")
[(set (match_operand:DI 0 "gpc_reg_operand" "=&r,r")
(plus:DI (ltu:DI (match_operand:DI 1 "gpc_reg_operand" "r,r")
(match_operand:DI 2 "reg_or_neg_short_operand" "r,P"))
(match_operand:DI 3 "reg_or_short_operand" "rI,rI")))]
"TARGET_64BIT"
"#"
"TARGET_64BIT"
"&& !reg_overlap_mentioned_p (operands[0], operands[3])"
[(set (match_dup 0) (neg:DI (ltu:DI (match_dup 1) (match_dup 2))))
(set (match_dup 0) (minus:DI (match_dup 3) (match_dup 0)))]
"")
@ -13628,25 +13628,25 @@
"")
(define_insn_and_split ""
[(set (match_operand:SI 0 "gpc_reg_operand" "=r")
[(set (match_operand:SI 0 "gpc_reg_operand" "=&r")
(plus:SI (gtu:SI (match_operand:SI 1 "gpc_reg_operand" "r")
(match_operand:SI 2 "reg_or_short_operand" "rI"))
(match_operand:SI 3 "reg_or_short_operand" "rI")))]
"TARGET_32BIT"
"#"
"TARGET_32BIT"
"&& !reg_overlap_mentioned_p (operands[0], operands[3])"
[(set (match_dup 0) (neg:SI (gtu:SI (match_dup 1) (match_dup 2))))
(set (match_dup 0) (minus:SI (match_dup 3) (match_dup 0)))]
"")
(define_insn_and_split ""
[(set (match_operand:DI 0 "gpc_reg_operand" "=r")
[(set (match_operand:DI 0 "gpc_reg_operand" "=&r")
(plus:DI (gtu:DI (match_operand:DI 1 "gpc_reg_operand" "r")
(match_operand:DI 2 "reg_or_short_operand" "rI"))
(match_operand:DI 3 "reg_or_short_operand" "rI")))]
"TARGET_64BIT"
"#"
"TARGET_64BIT"
"&& !reg_overlap_mentioned_p (operands[0], operands[3])"
[(set (match_dup 0) (neg:DI (gtu:DI (match_dup 1) (match_dup 2))))
(set (match_dup 0) (minus:DI (match_dup 3) (match_dup 0)))]
"")

3
gcc/testsuite/ChangeLog
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@ -1,5 +1,8 @@
2005-02-24 Jakub Jelinek <jakub@redhat.com>
PR target/20196
* gcc.c-torture/execute/20050224-1.c: New test.
PR c++/20175
* g++.dg/warn/Wbraces2.C: New test.

33
gcc/testsuite/gcc.c-torture/execute/20050224-1.c Normal file
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@ -0,0 +1,33 @@
/* Origin: Mikael Pettersson <mikpe@csd.uu.se> and the Linux kernel. */
extern void abort (void);
unsigned long a = 0xc0000000, b = 0xd0000000;
unsigned long c = 0xc01bb958, d = 0xc0264000;
unsigned long e = 0xc0288000, f = 0xc02d4378;
void
foo (int x, int y, int z)
{
if (x != 245 || y != 36 || z != 444)
abort ();
}
int
main (void)
{
unsigned long g;
int h = 0, i = 0, j = 0;
if (sizeof (unsigned long) < 4)
return 0;
for (g = a; g < b; g += 0x1000)
if (g < c)
h++;
else if (g >= d && g < e)
j++;
else if (g < f)
i++;
foo (i, j, h);
return 0;
}