diff options
Diffstat (limited to 'src/cmd/compile/internal/ssa/_gen/generic.rules')
| -rw-r--r-- | src/cmd/compile/internal/ssa/_gen/generic.rules | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/src/cmd/compile/internal/ssa/_gen/generic.rules b/src/cmd/compile/internal/ssa/_gen/generic.rules index 398601e81b..70bac217fa 100644 --- a/src/cmd/compile/internal/ssa/_gen/generic.rules +++ b/src/cmd/compile/internal/ssa/_gen/generic.rules @@ -2799,7 +2799,11 @@ // same memory state can reuse the results of the first call. // See issue 61725. // Note that this could pretty easily generalize to any pure function. -(StaticLECall {f} x y m:(SelectN [1] c:(StaticLECall {g} x y mem))) +(SelectN [0] (StaticLECall {f} x y (SelectN [1] c:(StaticLECall {g} x y mem)))) && isSameCall(f, "runtime.cmpstring") && isSameCall(g, "runtime.cmpstring") -=> (MakeResult (SelectN [0] <typ.Int> c) m) +=> @c.Block (SelectN [0] <typ.Int> c) + +// If we don't use the result of cmpstring, might as well not call it. +// Note that this could pretty easily generalize to any pure function. +(SelectN [1] c:(StaticLECall {f} _ _ mem)) && c.Uses == 1 && isSameCall(f, "runtime.cmpstring") && clobber(c) => mem |