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| author | Agniva De Sarker <agnivade@yahoo.co.in> | 2020-05-04 12:21:18 +0530 |
|---|---|---|
| committer | Agniva De Sarker <agniva.quicksilver@gmail.com> | 2020-05-06 13:55:00 +0000 |
| commit | 4daf8719e7f4c71a620f650d73caab2a9d7ea499 (patch) | |
| tree | abcfd92941eae651799b1632a9679b3a4603ffe9 /src/runtime/sys_wasm.s | |
| parent | 0f47c12a29e6277c8139e8d4f5a45272e437fe6e (diff) | |
| download | go-4daf8719e7f4c71a620f650d73caab2a9d7ea499.tar.xz | |
runtime: use correct truncated constants for float conversion
There is a range of numbers lower than 0x7fff_ffff_ffff_ffff which
cannot be represented by a 64 bit float. We set that to the correct
limit beyond which conversions can happen properly.
It appears that the negative bound check can indeed by correctly handled
by I64TruncF64S. But we use the same limit for consistency.
Fixes #38839
Change-Id: Ib783a22cb331fba7e6955459f41c67f9ceb53461
Reviewed-on: https://go-review.googlesource.com/c/go/+/231837
Reviewed-by: Keith Randall <khr@golang.org>
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Diffstat (limited to 'src/runtime/sys_wasm.s')
| -rw-r--r-- | src/runtime/sys_wasm.s | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/src/runtime/sys_wasm.s b/src/runtime/sys_wasm.s index 41260bdf23..e7a6570095 100644 --- a/src/runtime/sys_wasm.s +++ b/src/runtime/sys_wasm.s @@ -99,7 +99,7 @@ TEXT runtime·wasmTruncS(SB), NOSPLIT, $0-0 End Get R0 - F64Const $9223372036854775807. + F64Const $0x7ffffffffffffc00p0 // Maximum truncated representation of 0x7fffffffffffffff F64Gt If I64Const $0x8000000000000000 @@ -107,7 +107,7 @@ TEXT runtime·wasmTruncS(SB), NOSPLIT, $0-0 End Get R0 - F64Const $-9223372036854775808. + F64Const $-0x7ffffffffffffc00p0 // Minimum truncated representation of -0x8000000000000000 F64Lt If I64Const $0x8000000000000000 @@ -128,7 +128,7 @@ TEXT runtime·wasmTruncU(SB), NOSPLIT, $0-0 End Get R0 - F64Const $18446744073709551615. + F64Const $0xfffffffffffff800p0 // Maximum truncated representation of 0xffffffffffffffff F64Gt If I64Const $0x8000000000000000 |