Zack Buhman
ea3c389944
Previously, ast transformations were performed informally as ad-hoc modifications to the generated C source code. In this commit, the same transformations are performed by rewriting the ast prior to code generation time. The most significant new transformer is transform_assignment_list. This transforms assignments such as: a, b, c = f(b, c, d) To: a = f(&b, &c, d) The former syntax is used frequently in the manual's description of FPU-related instructions.
137 lines
2.1 KiB
C
137 lines
2.1 KiB
C
#pragma once
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#include <stdint.h>
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#include <assert.h>
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//
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// sign_extend
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//
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static inline int32_t sign_extend(uint32_t x, uint32_t b)
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{
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const uint32_t m = 1UL << (b - 1);
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x = x & ((1UL << b) - 1);
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const int32_t r = (x ^ m) - m;
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return r;
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}
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static inline int64_t sign_extend64(uint64_t x)
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{
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return (int64_t)x;
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}
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static inline int32_t sign_extend32(uint32_t x)
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{
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return (int32_t)x;
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}
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static inline int32_t sign_extend16(uint32_t x)
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{
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return sign_extend(x, 16);
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}
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static inline int32_t sign_extend12(uint32_t x)
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{
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return sign_extend(x, 12);
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}
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static inline int32_t sign_extend8(uint32_t x)
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{
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return sign_extend(x, 8);
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}
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//
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// zero_extend
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//
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static inline uint32_t zero_extend(uint32_t x, uint32_t b)
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{
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x = x & ((1ULL << b) - 1);
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return x;
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}
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static inline uint32_t zero_extend32(uint32_t x)
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{
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return (uint32_t)x;
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}
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static inline uint32_t zero_extend16(uint32_t x)
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{
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return zero_extend(x, 16);
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}
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static inline uint32_t zero_extend8(uint32_t x)
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{
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return zero_extend(x, 8);
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}
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static inline uint32_t zero_extend5(uint32_t x)
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{
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return zero_extend(x, 5);
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}
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static inline uint32_t zero_extend4(uint32_t x)
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{
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return zero_extend(x, 4);
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}
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static inline uint32_t zero_extend1(uint32_t x)
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{
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return zero_extend(x, 1);
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}
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//
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// signed_saturate
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//
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static inline uint64_t signed_saturate(uint64_t x, uint32_t b)
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{
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const int64_t upper = (1LL << (b - 1)) - 1;
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const int64_t lower = -(1LL << (b - 1));
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static_assert(-(1LL << (48 - 1)) < 0);
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if (x > upper)
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return upper;
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else if (x < lower)
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return lower;
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else
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return x;
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}
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static inline uint64_t signed_saturate48(uint64_t x)
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{
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return signed_saturate(x, 48);
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}
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static inline uint32_t signed_saturate32(uint32_t x)
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{
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return signed_saturate(x, 32);
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}
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//
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// "convenience" functions
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//
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static inline uint32_t _register(uint32_t x)
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{
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return zero_extend(x, 32);
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}
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static inline uint32_t bit(uint32_t x)
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{
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return zero_extend(x, 1);
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}
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//
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// "operations"
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//
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static inline int32_t unary_int(int64_t x)
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{
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return x != 0;
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}
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static inline int64_t bit_extract(int64_t n, int64_t b, int64_t m)
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{
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return (n >> b) & ((1 << m) - 1);
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}
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