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tint/reader/wgsl: Restructure Lexer::try_hex_float() constants 

No-op change. Just makes it easier to migrate to float64.

Bug: tint:1504
Change-Id: Ice5bf40514bc7f7faf30e51e4b1e22e6cf2375ad
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/91424
Reviewed-by: David Neto <dneto@google.com>
Commit-Queue: Ben Clayton <bclayton@google.com>
Kokoro: Kokoro <noreply+kokoro@google.com>
This commit is contained in:
Ben Clayton 2022-05-25 23:42:04 +00:00 committed by Dawn LUCI CQ
parent 3ad927cc73
commit 8ae9e94344
1 changed files with 5 additions and 5 deletions
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10
src/tint/reader/wgsl/lexer.cc
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@ -387,17 +387,17 @@ Token Lexer::try_float() {
}
Token Lexer::try_hex_float() {
constexpr uint32_t kTotalBits = 32;
constexpr uint32_t kTotalMsb = kTotalBits - 1;
constexpr uint32_t kExponentBits = 8;
constexpr uint32_t kMantissaBits = 23;
constexpr uint32_t kTotalBits = 1 + kExponentBits + kMantissaBits;
constexpr uint32_t kTotalMsb = kTotalBits - 1;
constexpr uint32_t kMantissaMsb = kMantissaBits - 1;
constexpr uint32_t kMantissaShiftRight = kTotalBits - kMantissaBits;
constexpr int32_t kExponentBias = 127;
constexpr int32_t kExponentMax = 255;
constexpr uint32_t kExponentBits = 8;
constexpr uint32_t kExponentMask = (1 << kExponentBits) - 1;
constexpr int32_t kExponentMax = kExponentMask; // Including NaN / inf
constexpr uint32_t kExponentLeftShift = kMantissaBits;
constexpr uint32_t kSignBit = 31;
constexpr uint32_t kSignBit = kTotalBits - 1;
auto start = pos();
auto end = pos();