diff options
Diffstat (limited to 'src/cmd/compile/internal/mips64/ssa.go')
| -rw-r--r-- | src/cmd/compile/internal/mips64/ssa.go | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/src/cmd/compile/internal/mips64/ssa.go b/src/cmd/compile/internal/mips64/ssa.go index 2727c4d8a83..b0e0165ad87 100644 --- a/src/cmd/compile/internal/mips64/ssa.go +++ b/src/cmd/compile/internal/mips64/ssa.go @@ -321,7 +321,10 @@ func ssaGenValue(s *gc.SSAGenState, v *ssa.Value) { for a.Op == ssa.OpCopy || a.Op == ssa.OpMIPS64MOVVreg { a = a.Args[0] } - if a.Op == ssa.OpLoadReg { + if a.Op == ssa.OpLoadReg && mips.REG_R0 <= a.Reg() && a.Reg() <= mips.REG_R31 { + // LoadReg from a narrower type does an extension, except loading + // to a floating point register. So only eliminate the extension + // if it is loaded to an integer register. t := a.Type switch { case v.Op == ssa.OpMIPS64MOVBreg && t.Size() == 1 && t.IsSigned(), |