It is incorrect to use vld/vori to implement the vec_concatz<mode> because when
the LSX
instruction is used to update the value of the vector register, the upper 128
bits of
the vector register will not be zeroed.
gcc/ChangeLog:
* config/loongarch/lasx.md (@vec_concatz<mode>): Remove this
define_insn pattern.
* config/loongarch/loongarch.cc (loongarch_expand_vector_group_init):
Use vec_concat<mode>.
diff --git a/gcc/config/loongarch/lasx.md b/gcc/config/loongarch/lasx.md
index 90f66ee4d24..e2115ffb884 100644
--- a/gcc/config/loongarch/lasx.md
+++ b/gcc/config/loongarch/lasx.md
@@ -582,21 +582,6 @@ (define_insn "lasx_xvinsgr2vr_<lasxfmt_f_wd>"
[(set_attr "type" "simd_insert")
(set_attr "mode" "<MODE>")])
-(define_insn "@vec_concatz<mode>"
- [(set (match_operand:LASX 0 "register_operand" "=f")
- (vec_concat:LASX
- (match_operand:<VHMODE256_ALL> 1 "nonimmediate_operand")
- (match_operand:<VHMODE256_ALL> 2 "const_0_operand")))]
- "ISA_HAS_LASX"
-{
- if (MEM_P (operands[1]))
- return "vld\t%w0,%1";
- else
- return "vori.b\t%w0,%w1,0";
-}
- [(set_attr "type" "simd_splat")
- (set_attr "mode" "<MODE>")])
-
(define_insn "vec_concat<mode>"
[(set (match_operand:LASX 0 "register_operand" "=f")
(vec_concat:LASX
diff --git a/gcc/config/loongarch/loongarch.cc
b/gcc/config/loongarch/loongarch.cc
index 072c68d97e3..cd335827570 100644
--- a/gcc/config/loongarch/loongarch.cc
+++ b/gcc/config/loongarch/loongarch.cc
@@ -9917,17 +9917,12 @@ loongarch_expand_vector_group_init (rtx target, rtx
vals)
gcc_unreachable ();
}
- if (high == CONST0_RTX (half_mode))
- emit_insn (gen_vec_concatz (vmode, target, low, high));
- else
- {
- if (!register_operand (low, half_mode))
- low = force_reg (half_mode, low);
- if (!register_operand (high, half_mode))
- high = force_reg (half_mode, high);
- emit_insn (gen_rtx_SET (target,
- gen_rtx_VEC_CONCAT (vmode, low, high)));
- }
+ if (!register_operand (low, half_mode))
+ low = force_reg (half_mode, low);
+ if (!register_operand (high, half_mode))
+ high = force_reg (half_mode, high);
+ emit_insn (gen_rtx_SET (target,
+ gen_rtx_VEC_CONCAT (vmode, low, high)));
}
/* Expand initialization of a vector which has all same elements. */
--
2.20.1
