diff options
Diffstat (limited to 'src/runtime/asm_wasm.s')
| -rw-r--r-- | src/runtime/asm_wasm.s | 66 |
1 files changed, 41 insertions, 25 deletions
diff --git a/src/runtime/asm_wasm.s b/src/runtime/asm_wasm.s index e075c72598..6666b554d6 100644 --- a/src/runtime/asm_wasm.s +++ b/src/runtime/asm_wasm.s @@ -410,36 +410,52 @@ TEXT runtime·cgocallback(SB), NOSPLIT, $0-24 // R0: the destination of the write (i64) // R1: the value being written (i64) TEXT runtime·gcWriteBarrier(SB), NOSPLIT, $16 - // R3 = g.m - MOVD g_m(g), R3 - // R4 = p - MOVD m_p(R3), R4 - // R5 = wbBuf.next - MOVD p_wbBuf+wbBuf_next(R4), R5 + Loop + // R3 = g.m + MOVD g_m(g), R3 + // R4 = p + MOVD m_p(R3), R4 + // R5 = wbBuf.next + MOVD p_wbBuf+wbBuf_next(R4), R5 - // Record value - MOVD R1, 0(R5) - // Record *slot - MOVD (R0), 8(R5) + // Increment wbBuf.next + Get R5 + I64Const $16 + I64Add + Set R5 - // Increment wbBuf.next - Get R5 - I64Const $16 - I64Add - Set R5 - MOVD R5, p_wbBuf+wbBuf_next(R4) + // Is the buffer full? + Get R5 + I64Load (p_wbBuf+wbBuf_end)(R4) + I64LeU + If + // Commit to the larger buffer. + MOVD R5, p_wbBuf+wbBuf_next(R4) + + // Back up to write position (wasm stores can't use negative offsets) + Get R5 + I64Const $16 + I64Sub + Set R5 + + // Record value + MOVD R1, 0(R5) + // Record *slot + MOVD (R0), 8(R5) + + // Do the write + MOVD R1, (R0) + + RET + End - Get R5 - I64Load (p_wbBuf+wbBuf_end)(R4) - I64Eq - If // Flush MOVD R0, 0(SP) MOVD R1, 8(SP) CALLNORESUME runtime·wbBufFlush(SB) - End - - // Do the write - MOVD R1, (R0) + MOVD 0(SP), R0 + MOVD 8(SP), R1 - RET + // Retry + Br $0 + End |