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[nvptx] Fix printing of 128-bit constant (negative case)

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For this code:
...
__int128 min_one = -1;
...
we currently generate:
...
.visible .global .align 8 .u64 min_one[2] = { -1, 0 };
...

Fix this in nvptx_assemble_value, such that we have instead:
...
.visible .global .align 8 .u64 min_one[2] = { -1, -1 };
...

gcc/ChangeLog:

	* config/nvptx/nvptx.c (nvptx_assemble_value): Handle negative
	__int128.

gcc/testsuite/ChangeLog:

	* gcc.target/nvptx/int128.c: New test.
This commit is contained in:
Tom de Vries 2020-09-11 05:40:36 +02:00
parent 848e74bea1
commit 60e537a026
2 changed files with 19 additions and 1 deletions
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5
gcc/config/nvptx/nvptx.c
View File

@ -2050,13 +2050,16 @@ output_init_frag (rtx sym)
static void
nvptx_assemble_value (unsigned HOST_WIDE_INT val, unsigned size)
{
bool negative_p
= val & (HOST_WIDE_INT_1U << (HOST_BITS_PER_WIDE_INT - 1));
val &= ((unsigned HOST_WIDE_INT)2 << (size * BITS_PER_UNIT - 1)) - 1;
for (unsigned part = 0; size; size -= part)
{
if (part * BITS_PER_UNIT == HOST_BITS_PER_WIDE_INT)
/* Avoid undefined behaviour. */
val = 0;
val = negative_p ? -1 : 0;
else
val >>= (part * BITS_PER_UNIT);
part = init_frag.size - init_frag.offset;

15
gcc/testsuite/gcc.target/nvptx/int128.c Normal file
View File

@ -0,0 +1,15 @@
/* { dg-do run } */
/* { dg-additional-options "-Wno-pedantic" } */
__int128 one = 1;
__int128 min_one = -1;
__int128 zero = 0;
int
main (void)
{
if (zero - one != min_one)
__builtin_abort ();
return 0;
}