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riscv-cc: Reference FP standards for FP types
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As reported in riscv-non-isa#430, we define the sizes and alignments of all
floating-point types, but we don't reference the underlying
standards. This change fills this gap.

Fixes: riscv-non-isa#430.

Signed-off-by: Christoph Müllner <christoph.muellner@vrull.eu>
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cmuellner committed Jun 25, 2024
1 parent 2092568 commit 8ac162d
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74 changes: 37 additions & 37 deletions riscv-cc.adoc
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Expand Up @@ -536,53 +536,53 @@ ILP32, ILP32F, ILP32D, and ILP32E:: Use the following type sizes and
alignments (based on the ILP32 convention):
+
.C/{Cpp} type sizes and alignments for RV32
[cols="4,>2,>3"]
[cols="4,>2,>3,4"]
[width=60%]
|===
| Type | Size (Bytes) | Alignment (Bytes)

| bool/_Bool | 1 | 1
| char | 1 | 1
| short | 2 | 2
| int | 4 | 4
| long | 4 | 4
| long long | 8 | 8
| void * | 4 | 4
| +++__bf16+++ | 2 | 2
| _Float16 | 2 | 2
| float | 4 | 4
| double | 8 | 8
| long double | 16 | 16
| float _Complex | 8 | 4
| double _Complex | 16 | 8
| long double _Complex | 32 | 16
| Type | Size (Bytes) | Alignment (Bytes) | Note

| bool/_Bool | 1 | 1 |
| char | 1 | 1 |
| short | 2 | 2 |
| int | 4 | 4 |
| long | 4 | 4 |
| long long | 8 | 8 |
| void * | 4 | 4 |
| +++__bf16+++ | 2 | 2 | Half precision floating point (bfloat16)
| _Float16 | 2 | 2 | Half precision floating point (binary16 in IEEE 754-2008)
| float | 4 | 4 | Single precision floating point (binary32 in IEEE 754-2008)
| double | 8 | 8 | Double precision floating point (binary64 in IEEE 754-2008)
| long double | 16 | 16 | Quadruple precision floating point (binary128 in IEEE 754-2008)
| float _Complex | 8 | 4 |
| double _Complex | 16 | 8 |
| long double _Complex | 32 | 16 |
|===

LP64, LP64F, LP64D, and LP64Q:: Use the following type sizes and
alignments (based on the LP64 convention):
+
.C/{Cpp} type sizes and alignments for RV64
[cols="4,>2,>3"]
[cols="4,>2,>3,4"]
[width=60%]
|===
| Type | Size (Bytes) | Alignment (Bytes)

| bool/_Bool | 1 | 1
| char | 1 | 1
| short | 2 | 2
| int | 4 | 4
| long | 8 | 8
| long long | 8 | 8
| +++__int128+++ | 16 | 16
| void * | 8 | 8
| +++__bf16+++ | 2 | 2
| _Float16 | 2 | 2
| float | 4 | 4
| double | 8 | 8
| long double | 16 | 16
| float _Complex | 8 | 4
| double _Complex | 16 | 8
| long double _Complex | 32 | 16
| Type | Size (Bytes) | Alignment (Bytes) | Note

| bool/_Bool | 1 | 1 |
| char | 1 | 1 |
| short | 2 | 2 |
| int | 4 | 4 |
| long | 8 | 8 |
| long long | 8 | 8 |
| +++__int128+++ | 16 | 16 |
| void * | 8 | 8 |
| +++__bf16+++ | 2 | 2 | Half precision floating point (bfloat16)
| _Float16 | 2 | 2 | Half precision floating point (binary16 in IEEE 754-2008)
| float | 4 | 4 | Single precision floating point (binary32 in IEEE 754-2008)
| double | 8 | 8 | Double precision floating point (binary64 in IEEE 754-2008)
| long double | 16 | 16 | Quadruple precision floating point (binary128 in IEEE 754-2008)
| float _Complex | 8 | 4 |
| double _Complex | 16 | 8 |
| long double _Complex | 32 | 16 |
|===

The alignment of `max_align_t` is 16.
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