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stage1: lower const f80 a different way

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this way passes the behavior tests
This commit is contained in:
Andrew Kelley 2022-01-28 11:40:19 -07:00
parent 3c827be876
commit a0a71709bc
1 changed files with 21 additions and 22 deletions
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43
src/stage1/codegen.cpp
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@ -8094,33 +8094,32 @@ static LLVMValueRef gen_const_val(CodeGen *g, ZigValue *const_val, const char *n
case 64:
return LLVMConstReal(get_llvm_type(g, type_entry), const_val->data.x_f64);
case 80: {
LLVMTypeRef llvm_i80 = LLVMIntType(80);
LLVMValueRef x;
if (g->is_big_endian) {
x = LLVMConstInt(llvm_i80, const_val->data.x_f80.signExp, false);
x = LLVMConstShl(x, LLVMConstInt(llvm_i80, 64, false));
x = LLVMConstOr(x, LLVMConstInt(llvm_i80, const_val->data.x_f80.signif, false));
} else {
x = LLVMConstInt(llvm_i80, const_val->data.x_f80.signif, false);
x = LLVMConstShl(x, LLVMConstInt(llvm_i80, 16, false));
x = LLVMConstOr(x, LLVMConstInt(llvm_i80, const_val->data.x_f80.signExp, false));
}
return LLVMConstBitCast(x, get_llvm_type(g, type_entry));
uint64_t buf[2];
memcpy(&buf, &const_val->data.x_f80, 16);
#if ZIG_BYTE_ORDER == ZIG_BIG_ENDIAN
uint64_t tmp = buf[0];
buf[0] = buf[1];
buf[1] = tmp;
#endif
LLVMValueRef as_i128 = LLVMConstIntOfArbitraryPrecision(LLVMInt128Type(), 2, buf);
LLVMValueRef as_int = LLVMConstTrunc(as_i128, LLVMIntType(80));
return LLVMConstBitCast(as_int, get_llvm_type(g, type_entry));
}
case 128:
{
uint64_t buf[2];
// LLVM seems to require that the lower half of the f128 be placed first in the buffer.
#if defined(ZIG_BYTE_ORDER) && ZIG_BYTE_ORDER == ZIG_LITTLE_ENDIAN
buf[0] = const_val->data.x_f128.v[0];
buf[1] = const_val->data.x_f128.v[1];
#elif defined(ZIG_BYTE_ORDER) && ZIG_BYTE_ORDER == ZIG_BIG_ENDIAN
buf[0] = const_val->data.x_f128.v[1];
buf[1] = const_val->data.x_f128.v[0];
#else
#error Unsupported endian
#endif
// LLVM seems to require that the lower half of the f128 be
// placed first in the buffer.
#if ZIG_BYTE_ORDER == ZIG_LITTLE_ENDIAN
buf[0] = const_val->data.x_f128.v[0];
buf[1] = const_val->data.x_f128.v[1];
#elif ZIG_BYTE_ORDER == ZIG_BIG_ENDIAN
buf[0] = const_val->data.x_f128.v[1];
buf[1] = const_val->data.x_f128.v[0];
#else
#error Unsupported endian
#endif
LLVMValueRef as_int = LLVMConstIntOfArbitraryPrecision(LLVMInt128Type(), 2, buf);
return LLVMConstBitCast(as_int, get_llvm_type(g, type_entry));