f9865a08bc
This optimizes a common pattern like:
if s != "" {
...
}
to:
if len(s) != 0 {
...
}
This avoids a runtime call and thus produces slightly better code.
19 строки
838 Б
LLVM
19 строки
838 Б
LLVM
target datalayout = "e-m:e-p:32:32-i64:64-v128:64:128-a:0:32-n32-S64"
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target triple = "armv7m-none-eabi"
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@zeroString = constant [0 x i8] zeroinitializer
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declare i1 @runtime.stringEqual(i8*, i32, i8*, i32, i8*, i8*)
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define i1 @main.stringCompareEqualConstantZero(i8* %s1.data, i32 %s1.len, i8* %context, i8* %parentHandle) {
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entry:
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%0 = call i1 @runtime.stringEqual(i8* %s1.data, i32 %s1.len, i8* getelementptr inbounds ([0 x i8], [0 x i8]* @zeroString, i32 0, i32 0), i32 0, i8* undef, i8* null)
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ret i1 %0
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}
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define i1 @main.stringCompareUnequalConstantZero(i8* %s1.data, i32 %s1.len, i8* %context, i8* %parentHandle) {
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entry:
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%0 = call i1 @runtime.stringEqual(i8* %s1.data, i32 %s1.len, i8* getelementptr inbounds ([0 x i8], [0 x i8]* @zeroString, i32 0, i32 0), i32 0, i8* undef, i8* null)
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%1 = xor i1 %0, true
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ret i1 %1
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}
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