diff options
Diffstat (limited to 'src/cmd/compile/internal/ssa/gen/386Ops.go')
| -rw-r--r-- | src/cmd/compile/internal/ssa/gen/386Ops.go | 14 |
1 files changed, 0 insertions, 14 deletions
diff --git a/src/cmd/compile/internal/ssa/gen/386Ops.go b/src/cmd/compile/internal/ssa/gen/386Ops.go index ddabde7d3d..737b99c371 100644 --- a/src/cmd/compile/internal/ssa/gen/386Ops.go +++ b/src/cmd/compile/internal/ssa/gen/386Ops.go @@ -51,17 +51,6 @@ var regNames386 = []string{ "SB", } -// Notes on 387 support. -// - The 387 has a weird stack-register setup for floating-point registers. -// We use these registers when SSE registers are not available (when GO386=387). -// - We use the same register names (X0-X7) but they refer to the 387 -// floating-point registers. That way, most of the SSA backend is unchanged. -// - The instruction generation pass maintains an SSE->387 register mapping. -// This mapping is updated whenever the FP stack is pushed or popped so that -// we can always find a given SSE register even when the TOS pointer has changed. -// - To facilitate the mapping from SSE to 387, we enforce that -// every basic block starts and ends with an empty floating-point stack. - func init() { // Make map from reg names to reg integers. if len(regNames386) > 64 { @@ -552,9 +541,6 @@ func init() { {name: "FlagGT_UGT"}, // signed > and unsigned < {name: "FlagGT_ULT"}, // signed > and unsigned > - // Special op for -x on 387 - {name: "FCHS", argLength: 1, reg: fp11}, - // Special ops for PIC floating-point constants. // MOVSXconst1 loads the address of the constant-pool entry into a register. // MOVSXconst2 loads the constant from that address. |