[dev.ssa] cmd/compile: handle floating point on ARM
Machine supports (or the runtime simulates in soft float mode)
(u)int32<->float conversions. The frontend rewrites int64<->float
conversions to call to runtime function.
For int64->float32 conversion, the frontend generates
. . AS u(100) l(10) tc(1)
. . . NAME-main.~r1 u(1) a(true) g(1) l(9) x(8+0) class(PPARAMOUT) f(1) float32
. . . CALLFUNC u(100) l(10) tc(1) float32
. . . . NAME-runtime.int64tofloat64 u(1) a(true) x(0+0) class(PFUNC) tc(1) used(true) FUNC-func(int64) float64
The CALLFUNC node has type float32, whereas runtime.int64tofloat64
returns float64. The legacy backend implicitly makes a float64->float32
conversion. The SSA backend does not do implicit conversion, so we
insert an explicit CONV here.
All cmd/compile/internal/gc/testdata/*_ssa.go tests passed.
Progress on SSA for ARM. Still not complete.
Update #15365.
Change-Id: I30937c8ff977271246b068f48224693776804339
Reviewed-on: https://go-review.googlesource.com/23652
Reviewed-by: Keith Randall <khr@golang.org>
diff --git a/src/cmd/compile/internal/ssa/gen/genericOps.go b/src/cmd/compile/internal/ssa/gen/genericOps.go
index 72b7f6f..e35da2b 100644
--- a/src/cmd/compile/internal/ssa/gen/genericOps.go
+++ b/src/cmd/compile/internal/ssa/gen/genericOps.go
@@ -433,6 +433,11 @@
{name: "Signmask", argLength: 1, typ: "Int32"}, // 0 if arg0 >= 0, -1 if arg0 < 0
{name: "Zeromask", argLength: 1, typ: "UInt32"}, // 0 if arg0 == 0, 0xffffffff if arg0 != 0
+ {name: "Cvt32Uto32F", argLength: 1}, // uint32 -> float32, only used on 32-bit arch
+ {name: "Cvt32Uto64F", argLength: 1}, // uint32 -> float64, only used on 32-bit arch
+ {name: "Cvt32Fto32U", argLength: 1}, // float32 -> uint32, only used on 32-bit arch
+ {name: "Cvt64Fto32U", argLength: 1}, // float64 -> uint32, only used on 32-bit arch
+
// pseudo-ops for breaking Tuple
{name: "Select0", argLength: 1}, // the first component of a tuple
{name: "Select1", argLength: 1}, // the second component of a tuple
