diff options
Diffstat (limited to 'src/cmd/compile/internal/gc/subr.go')
| -rw-r--r-- | src/cmd/compile/internal/gc/subr.go | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/src/cmd/compile/internal/gc/subr.go b/src/cmd/compile/internal/gc/subr.go index 0a2a11663e..7c1ab89b78 100644 --- a/src/cmd/compile/internal/gc/subr.go +++ b/src/cmd/compile/internal/gc/subr.go @@ -542,7 +542,7 @@ func methtype(t *types.Type) *types.Type { // Is type src assignment compatible to type dst? // If so, return op code to use in conversion. // If not, return OXXX. -func assignop(src *types.Type, dst *types.Type, why *string) Op { +func assignop(src, dst *types.Type, why *string) Op { if why != nil { *why = "" } @@ -665,7 +665,8 @@ func assignop(src *types.Type, dst *types.Type, why *string) Op { // Can we convert a value of type src to a value of type dst? // If so, return op code to use in conversion (maybe OCONVNOP). // If not, return OXXX. -func convertop(src *types.Type, dst *types.Type, why *string) Op { +// srcConstant indicates whether the value of type src is a constant. +func convertop(srcConstant bool, src, dst *types.Type, why *string) Op { if why != nil { *why = "" } @@ -741,6 +742,13 @@ func convertop(src *types.Type, dst *types.Type, why *string) Op { return OCONV } + // Special case for constant conversions: any numeric + // conversion is potentially okay. We'll validate further + // within evconst. See #38117. + if srcConstant && (src.IsInteger() || src.IsFloat() || src.IsComplex()) && (dst.IsInteger() || dst.IsFloat() || dst.IsComplex()) { + return OCONV + } + // 6. src is an integer or has type []byte or []rune // and dst is a string type. if src.IsInteger() && dst.IsString() { |