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LoongArch: Add constraints for bit string operation define_insn_and_split's [PR114861]

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Without the constrants, the compiler attempts to use a stack slot as the
target, causing an ICE building the kernel with -Os:

    drivers/gpu/drm/amd/amdgpu/gfx_v6_0.c:3144:1:
    error: could not split insn
    (insn:TI 1764 67 1745
      (set (mem/c:DI (reg/f:DI 3 $r3) [707 %sfp+-80 S8 A64])
           (and:DI (reg/v:DI 28 $r28 [orig:422 raster_config ] [422])
                   (const_int -50331649 [0xfffffffffcffffff])))
      "drivers/gpu/drm/amd/amdgpu/gfx_v6_0.c":1386:21 111
      {*bstrins_di_for_mask}
      (nil))

Add these constrants to fix the issue.

gcc/ChangeLog:

	PR target/114861
	* config/loongarch/loongarch.md (bstrins_<mode>_for_mask): Add
	constraints for operands.
	(bstrins_<mode>_for_ior_mask): Likewise.

gcc/testsuite/ChangeLog:

	PR target/114861
	* gcc.target/loongarch/pr114861.c: New test.
This commit is contained in:
Xi Ruoyao
2024-04-26 15:59:11 +08:00
parent 50c218e3ff
commit 140124ad54
2 changed files with 47 additions and 8 deletions
Download Patch File Download Diff File Expand all files Collapse all files

16
gcc/config/loongarch/loongarch.md
View File

@@ -1543,9 +1543,9 @@
(set_attr "mode" "<MODE>")])
(define_insn_and_split "*bstrins_<mode>_for_mask"
[(set (match_operand:GPR 0 "register_operand")
(and:GPR (match_operand:GPR 1 "register_operand")
(match_operand:GPR 2 "ins_zero_bitmask_operand")))]
[(set (match_operand:GPR 0 "register_operand" "=r")
(and:GPR (match_operand:GPR 1 "register_operand" "r")
(match_operand:GPR 2 "ins_zero_bitmask_operand" "i")))]
""
"#"
""
@@ -1563,11 +1563,11 @@
})
(define_insn_and_split "*bstrins_<mode>_for_ior_mask"
[(set (match_operand:GPR 0 "register_operand")
(ior:GPR (and:GPR (match_operand:GPR 1 "register_operand")
(match_operand:GPR 2 "const_int_operand"))
(and:GPR (match_operand:GPR 3 "register_operand")
(match_operand:GPR 4 "const_int_operand"))))]
[(set (match_operand:GPR 0 "register_operand" "=r")
(ior:GPR (and:GPR (match_operand:GPR 1 "register_operand" "r")
(match_operand:GPR 2 "const_int_operand" "i"))
(and:GPR (match_operand:GPR 3 "register_operand" "r")
(match_operand:GPR 4 "const_int_operand" "i"))))]
"loongarch_pre_reload_split ()
&& loongarch_use_bstrins_for_ior_with_mask (<MODE>mode, operands)"
"#"

39
gcc/testsuite/gcc.target/loongarch/pr114861.c Normal file
View File

@@ -0,0 +1,39 @@
/* PR114861: ICE building the kernel with -Os
Reduced from linux/fs/ntfs3/attrib.c at revision c942a0cd3603. */
/* { dg-do compile } */
/* { dg-options "-Os -march=loongarch64 -msoft-float -mabi=lp64s" } */
long evcn, attr_collapse_range_vbo, attr_collapse_range_bytes;
unsigned short flags;
int attr_collapse_range_ni_0_0;
int *attr_collapse_range_mi;
unsigned attr_collapse_range_svcn, attr_collapse_range_vcn1;
void ni_insert_nonresident (unsigned, unsigned short, int **);
int mi_pack_runs (int);
int
attr_collapse_range (void)
{
_Bool __trans_tmp_1;
int run = attr_collapse_range_ni_0_0;
unsigned evcn1, vcn, end;
short a_flags = flags;
__trans_tmp_1 = flags & (32768 | 1);
if (__trans_tmp_1)
return 2;
vcn = attr_collapse_range_vbo;
end = attr_collapse_range_bytes;
evcn1 = evcn;
for (;;)
if (attr_collapse_range_svcn >= end)
{
unsigned eat, next_svcn = mi_pack_runs (42);
attr_collapse_range_vcn1 = (vcn ? vcn : attr_collapse_range_svcn);
eat = (0 < end) - attr_collapse_range_vcn1;
mi_pack_runs (run - eat);
if (next_svcn + eat)
ni_insert_nonresident (evcn1 - eat - next_svcn, a_flags,
&attr_collapse_range_mi);
}
else
return 42;
}