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RISC-V: Fix riscv_vector_chunks configuration according to TARGET_MIN_VLEN

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gcc/ChangeLog:

	* config/riscv/riscv.cc (riscv_convert_vector_bits): Change
	configuration according to TARGET_MIN_VLEN.
	* config/riscv/riscv.h (UNITS_PER_FP_REG): Fix comment.
This commit is contained in:
zhongjuzhe 2022-08-30 09:50:24 +08:00 • committed by Kito Cheng
parent 542c60c4fb
commit e9f827d791
2 changed files with 8 additions and 7 deletions
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13
gcc/config/riscv/riscv.cc
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@ -5219,22 +5219,23 @@ riscv_init_machine_status (void)
static poly_uint16
riscv_convert_vector_bits (void)
{
/* The runtime invariant is only meaningful when vector is enabled. */
/* The runtime invariant is only meaningful when TARGET_VECTOR is enabled. */
if (!TARGET_VECTOR)
return 0;
if (TARGET_VECTOR_ELEN_64 || TARGET_VECTOR_ELEN_FP_64)
if (TARGET_MIN_VLEN > 32)
{
/* When targetting Zve64* (ELEN = 64) extensions, we should use 64-bit
chunk size. Runtime invariant: The single indeterminate represent the
/* When targetting minimum VLEN > 32, we should use 64-bit chunk size.
Otherwise we can not include SEW = 64bits.
Runtime invariant: The single indeterminate represent the
number of 64-bit chunks in a vector beyond minimum length of 64 bits.
Thus the number of bytes in a vector is 8 + 8 * x1 which is
riscv_vector_chunks * 8 = poly_int (8, 8). */
riscv_vector_chunks * 8 = poly_int (8, 8). */
riscv_bytes_per_vector_chunk = 8;
}
else
{
/* When targetting Zve32* (ELEN = 32) extensions, we should use 32-bit
/* When targetting minimum VLEN = 32, we should use 32-bit
chunk size. Runtime invariant: The single indeterminate represent the
number of 32-bit chunks in a vector beyond minimum length of 32 bits.
Thus the number of bytes in a vector is 4 + 4 * x1 which is

2
gcc/config/riscv/riscv.h
View file

@ -160,7 +160,7 @@ ASM_MISA_SPEC
/* The `Q' extension is not yet supported. */
#define UNITS_PER_FP_REG (TARGET_DOUBLE_FLOAT ? 8 : 4)
/* Size per vector register. For zve32*, size = poly (4, 4). Otherwise, size = poly (8, 8). */
/* Size per vector register. For VLEN = 32, size = poly (4, 4). Otherwise, size = poly (8, 8). */
#define UNITS_PER_V_REG (riscv_vector_chunks * riscv_bytes_per_vector_chunk)
/* The largest type that can be passed in floating-point registers. */