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i386: Fix unsigned int -> double conversion on i386 w/ -mfpmath=sse [PR100119]

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2021-04-22  Uroš Bizjak  <ubizjak@gmail.com>

gcc/
	PR target/100119
	* config/i386/i386-expand.c (ix86_expand_convert_uns_sidf_sse):
	Remove the sign with FE_DOWNWARD, where x - x = -0.0.

gcc/testsuite/

	PR target/100119
	* gcc.target/i386/pr100119.c: New test.
This commit is contained in:
Uros Bizjak 2021-04-22 16:30:38 +02:00
parent 0f4588141f
commit 0cda606d08
2 changed files with 35 additions and 0 deletions
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7
gcc/config/i386/i386-expand.c
View File

@ -1550,6 +1550,8 @@ ix86_expand_convert_uns_sixf_sse (rtx, rtx)
gcc_unreachable ();
}
static rtx ix86_expand_sse_fabs (rtx op0, rtx *smask);
/* Convert an unsigned SImode value into a DFmode. Only currently used
for SSE, but applicable anywhere. */
@ -1569,6 +1571,11 @@ ix86_expand_convert_uns_sidf_sse (rtx target, rtx input)
x = const_double_from_real_value (TWO31r, DFmode);
x = expand_simple_binop (DFmode, PLUS, fp, x, target, 0, OPTAB_DIRECT);
/* Remove the sign with FE_DOWNWARD, where x - x = -0.0. */
if (HONOR_SIGNED_ZEROS (DFmode) && flag_rounding_math)
x = ix86_expand_sse_fabs (x, NULL);
if (x != target)
emit_move_insn (target, x);
}

28
gcc/testsuite/gcc.target/i386/pr100119.c Normal file
View File

@ -0,0 +1,28 @@
/* PR target/100119 */
/* { dg-do run { target sse2_runtime } } */
/* { dg-require-effective-target fenv } */
/* { dg-options "-O2 -frounding-math -msse2 -mno-avx512f -mfpmath=sse" } */
#include <fenv.h>
double
__attribute__((noinline))
test (unsigned int x)
{
return x;
}
int
main ()
{
double result;
fesetround (FE_DOWNWARD);
result = test (0);
if (__builtin_signbit (result) != 0)
__builtin_abort ();
return 0;
}