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cmd/compile: add 32 bit float registers/variables on wasm

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Before this change, wasm only used float variables with a size of 64 bit
and applied rounding to 32 bit precision where necessary. This change
adds proper 32 bit float variables.

Reduces the size of pkg/js_wasm by 254 bytes.

Change-Id: Ieabe846a8cb283d66def3cdf11e2523b3b31f345
Reviewed-on: https://go-review.googlesource.com/c/go/+/195117
Reviewed-by: Cherry Zhang <cherryyz@google.com>
This commit is contained in:
Richard Musiol 2019-09-12 21:05:45 +02:00 • committed by Richard Musiol
parent d6c2f1e90e
commit 1c50fcf853
10 changed files with 802 additions and 375 deletions
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26
src/cmd/internal/obj/wasm/wasmobj.go
View file

@ -59,6 +59,23 @@ var Register = map[string]int16{
"F14": REG_F14,
"F15": REG_F15,
"F16": REG_F16,
"F17": REG_F17,
"F18": REG_F18,
"F19": REG_F19,
"F20": REG_F20,
"F21": REG_F21,
"F22": REG_F22,
"F23": REG_F23,
"F24": REG_F24,
"F25": REG_F25,
"F26": REG_F26,
"F27": REG_F27,
"F28": REG_F28,
"F29": REG_F29,
"F30": REG_F30,
"F31": REG_F31,
"PC_B": REG_PC_B,
}
@ -841,7 +858,7 @@ func assemble(ctxt *obj.Link, s *obj.LSym, newprog obj.ProgAlloc) {
}
regs := []int16{REG_SP}
for reg := int16(REG_R0); reg <= REG_F15; reg++ {
for reg := int16(REG_R0); reg <= REG_F31; reg++ {
if regUsed[reg-MINREG] {
regs = append(regs, reg)
}
@ -1022,6 +1039,11 @@ func assemble(ctxt *obj.Link, s *obj.LSym, newprog obj.ProgAlloc) {
}
writeSleb128(w, p.From.Offset)
case AF32Const:
b := make([]byte, 4)
binary.LittleEndian.PutUint32(b, math.Float32bits(float32(p.From.Val.(float64))))
w.Write(b)
case AF64Const:
b := make([]byte, 8)
binary.LittleEndian.PutUint64(b, math.Float64bits(p.From.Val.(float64)))
@ -1106,6 +1128,8 @@ func regType(reg int16) valueType {
case reg >= REG_R0 && reg <= REG_R15:
return i64
case reg >= REG_F0 && reg <= REG_F15:
return f32
case reg >= REG_F16 && reg <= REG_F31:
return f64
default:
panic("invalid register")