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re PR rtl-optimization/32293 (internal compiler error: in do_SUBST, at combine.c:502)

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PR rtl-optimization/32293
	* combine.c (simplify_if_then_else): Truncate return from
	nonzero_bits() to correct mode.

testsuite/ChangeLog:
	
	PR rtl-optimization/32293
	* gcc.dg/pr32293.c: New test.

From-SVN: r125643
This commit is contained in:
Uros Bizjak 2007-06-12 12:31:04 +02:00 committed by Uros Bizjak
parent 9883e373fc
commit 7f482dfebf
4 changed files with 80 additions and 2 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2007-06-12 Uros Bizjak <ubizjak@gmail.com>
PR rtl-optimization/32293
* combine.c (simplify_if_then_else): Truncate return from
nonzero_bits() to correct mode.
2007-06-12 Uros Bizjak <ubizjak@gmail.com>
* fold-const (fold_binary) [RDIV_EXPR]: Also optimize a/cbrt(b/c)

10
gcc/combine.c
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@ -5210,11 +5210,17 @@ simplify_if_then_else (rtx x)
if (true_code == EQ && true_val == const0_rtx
&& exact_log2 (nzb = nonzero_bits (from, GET_MODE (from))) >= 0)
false_code = EQ, false_val = GEN_INT (nzb);
{
false_code = EQ;
false_val = GEN_INT (trunc_int_for_mode (nzb, GET_MODE (from)));
}
else if (true_code == EQ && true_val == const0_rtx
&& (num_sign_bit_copies (from, GET_MODE (from))
== GET_MODE_BITSIZE (GET_MODE (from))))
false_code = EQ, false_val = constm1_rtx;
{
false_code = EQ;
false_val = constm1_rtx;
}
/* Now simplify an arm if we know the value of the register in the
branch and it is used in the arm. Be careful due to the potential

5
gcc/testsuite/ChangeLog
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@ -1,3 +1,8 @@
2007-06-12 Uros Bizjak <ubizjak@gmail.com>
PR rtl-optimization/32293
* gcc.dg/pr32293.c: New test.
2007-06-12 Uros Bizjak <ubizjak@gmail.com>
* gcc.dg/builtins-11.c: Also check folding of a/cbrt(b/c).

61
gcc/testsuite/gcc.dg/pr32293.c Normal file
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@ -0,0 +1,61 @@
/* { dg-do compile } */
/* { dg-options "-O2" } */
unsigned int _IDEC_glbround;
unsigned int _IDEC_glbflags;
typedef unsigned UINT32;
typedef signed SINT32;
typedef unsigned long long UINT64;
typedef signed long long SINT64;
typedef
__attribute__ ((aligned(16)))
struct {
UINT64 w[2];
} UINT128;
static __inline UINT64
unpack_BID128 (UINT64 * psign_x, int *pexponent_x,
UINT128 * pcoefficient_x, UINT128 * px) {
UINT128 coeff;
UINT64 ex;
*psign_x = (px->w[1]) & 0x8000000000000000ull;
ex = (px->w[1]) >> 49;
*pexponent_x = ((int) ex) & 0x3fff;
return coeff.w[0] | coeff.w[1];
}
static __inline UINT32
get_BID32 (UINT32 sgn, int expon, UINT64 coeff, int rmode,
unsigned *fpsc) {
UINT32 r;
if (((unsigned) expon) > 191) {
r = sgn | 0x78000000ul;
switch (rmode) {
case 0x00002:
if (sgn)
r = sgn | 0x77f8967f;
}
return r;
}
r = expon;
return r;
}
UINT32
bid128_to_bid32 (UINT128 x)
{
UINT128 *px;
UINT128 CX;
UINT64 sign_x;
UINT32 res;
int exponent_x = 0;
px = &x;
if (!unpack_BID128 (&sign_x, &exponent_x, &CX, px)) {
return(res);
}
res = get_BID32 ((UINT32) (sign_x >> 32),
exponent_x, CX.w[0], _IDEC_glbround, &_IDEC_glbflags);
return(res);;
}