86f1e6aec4
The division and remainder operations were lowered directly to LLVM IR. This is wrong however because the Go specification defines exactly what happens on a divide by zero or signed integer overflow and LLVM IR itself treats those cases as undefined behavior. Therefore, this commit implements divide by zero and signed integer overflow according to the Go specification. This does have an impact on the generated code, but it is surprisingly small. I've used the drivers repo to test the code before and after, and to my surprise most driver smoke tests are not changed at all. Those that are, have only a small increase in code size. At the same time, this change makes TinyGo more compliant to the Go specification.
202 строки
5,9 КиБ
LLVM
202 строки
5,9 КиБ
LLVM
; ModuleID = 'basic.go'
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source_filename = "basic.go"
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target datalayout = "e-m:e-p:32:32-i64:64-n32:64-S128"
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target triple = "wasm32-unknown-wasi"
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%main.kv = type { float }
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%main.kv.0 = type { i8 }
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declare noalias nonnull i8* @runtime.alloc(i32, i8*, i8*)
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; Function Attrs: nounwind
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define hidden void @main.init(i8* %context, i8* %parentHandle) unnamed_addr #0 {
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entry:
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ret void
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}
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; Function Attrs: nounwind
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define hidden i32 @main.addInt(i32 %x, i32 %y, i8* %context, i8* %parentHandle) unnamed_addr #0 {
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entry:
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%0 = add i32 %x, %y
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ret i32 %0
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}
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; Function Attrs: nounwind
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define hidden i1 @main.equalInt(i32 %x, i32 %y, i8* %context, i8* %parentHandle) unnamed_addr #0 {
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entry:
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%0 = icmp eq i32 %x, %y
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ret i1 %0
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}
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; Function Attrs: nounwind
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define hidden i32 @main.divInt(i32 %x, i32 %y, i8* %context, i8* %parentHandle) unnamed_addr #0 {
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entry:
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%0 = icmp eq i32 %y, 0
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br i1 %0, label %divbyzero.throw, label %divbyzero.next
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divbyzero.throw: ; preds = %entry
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call void @runtime.divideByZeroPanic(i8* undef, i8* null) #0
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unreachable
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divbyzero.next: ; preds = %entry
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%1 = icmp eq i32 %y, -1
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%2 = icmp eq i32 %x, -2147483648
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%3 = and i1 %1, %2
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%4 = select i1 %3, i32 1, i32 %y
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%5 = sdiv i32 %x, %4
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ret i32 %5
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}
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declare void @runtime.divideByZeroPanic(i8*, i8*)
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; Function Attrs: nounwind
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define hidden i32 @main.divUint(i32 %x, i32 %y, i8* %context, i8* %parentHandle) unnamed_addr #0 {
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entry:
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%0 = icmp eq i32 %y, 0
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br i1 %0, label %divbyzero.throw, label %divbyzero.next
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divbyzero.throw: ; preds = %entry
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call void @runtime.divideByZeroPanic(i8* undef, i8* null) #0
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unreachable
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divbyzero.next: ; preds = %entry
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%1 = udiv i32 %x, %y
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ret i32 %1
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}
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; Function Attrs: nounwind
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define hidden i32 @main.remInt(i32 %x, i32 %y, i8* %context, i8* %parentHandle) unnamed_addr #0 {
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entry:
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%0 = icmp eq i32 %y, 0
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br i1 %0, label %divbyzero.throw, label %divbyzero.next
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divbyzero.throw: ; preds = %entry
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call void @runtime.divideByZeroPanic(i8* undef, i8* null) #0
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unreachable
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divbyzero.next: ; preds = %entry
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%1 = icmp eq i32 %y, -1
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%2 = icmp eq i32 %x, -2147483648
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%3 = and i1 %1, %2
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%4 = select i1 %3, i32 1, i32 %y
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%5 = srem i32 %x, %4
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ret i32 %5
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}
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; Function Attrs: nounwind
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define hidden i32 @main.remUint(i32 %x, i32 %y, i8* %context, i8* %parentHandle) unnamed_addr #0 {
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entry:
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%0 = icmp eq i32 %y, 0
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br i1 %0, label %divbyzero.throw, label %divbyzero.next
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divbyzero.throw: ; preds = %entry
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call void @runtime.divideByZeroPanic(i8* undef, i8* null) #0
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unreachable
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divbyzero.next: ; preds = %entry
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%1 = urem i32 %x, %y
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ret i32 %1
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}
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; Function Attrs: nounwind
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define hidden i1 @main.floatEQ(float %x, float %y, i8* %context, i8* %parentHandle) unnamed_addr #0 {
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entry:
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%0 = fcmp oeq float %x, %y
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ret i1 %0
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}
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; Function Attrs: nounwind
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define hidden i1 @main.floatNE(float %x, float %y, i8* %context, i8* %parentHandle) unnamed_addr #0 {
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entry:
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%0 = fcmp une float %x, %y
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ret i1 %0
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}
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; Function Attrs: nounwind
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define hidden i1 @main.floatLower(float %x, float %y, i8* %context, i8* %parentHandle) unnamed_addr #0 {
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entry:
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%0 = fcmp olt float %x, %y
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ret i1 %0
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}
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; Function Attrs: nounwind
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define hidden i1 @main.floatLowerEqual(float %x, float %y, i8* %context, i8* %parentHandle) unnamed_addr #0 {
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entry:
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%0 = fcmp ole float %x, %y
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ret i1 %0
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}
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; Function Attrs: nounwind
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define hidden i1 @main.floatGreater(float %x, float %y, i8* %context, i8* %parentHandle) unnamed_addr #0 {
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entry:
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%0 = fcmp ogt float %x, %y
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ret i1 %0
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}
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; Function Attrs: nounwind
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define hidden i1 @main.floatGreaterEqual(float %x, float %y, i8* %context, i8* %parentHandle) unnamed_addr #0 {
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entry:
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%0 = fcmp oge float %x, %y
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ret i1 %0
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}
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; Function Attrs: nounwind
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define hidden float @main.complexReal(float %x.r, float %x.i, i8* %context, i8* %parentHandle) unnamed_addr #0 {
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entry:
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ret float %x.r
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}
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; Function Attrs: nounwind
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define hidden float @main.complexImag(float %x.r, float %x.i, i8* %context, i8* %parentHandle) unnamed_addr #0 {
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entry:
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ret float %x.i
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}
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; Function Attrs: nounwind
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define hidden { float, float } @main.complexAdd(float %x.r, float %x.i, float %y.r, float %y.i, i8* %context, i8* %parentHandle) unnamed_addr #0 {
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entry:
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%0 = fadd float %x.r, %y.r
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%1 = fadd float %x.i, %y.i
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%2 = insertvalue { float, float } undef, float %0, 0
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%3 = insertvalue { float, float } %2, float %1, 1
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ret { float, float } %3
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}
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; Function Attrs: nounwind
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define hidden { float, float } @main.complexSub(float %x.r, float %x.i, float %y.r, float %y.i, i8* %context, i8* %parentHandle) unnamed_addr #0 {
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entry:
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%0 = fsub float %x.r, %y.r
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%1 = fsub float %x.i, %y.i
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%2 = insertvalue { float, float } undef, float %0, 0
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%3 = insertvalue { float, float } %2, float %1, 1
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ret { float, float } %3
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}
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; Function Attrs: nounwind
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define hidden { float, float } @main.complexMul(float %x.r, float %x.i, float %y.r, float %y.i, i8* %context, i8* %parentHandle) unnamed_addr #0 {
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entry:
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%0 = fmul float %x.r, %y.r
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%1 = fmul float %x.i, %y.i
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%2 = fsub float %0, %1
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%3 = fmul float %x.r, %y.i
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%4 = fmul float %x.i, %y.r
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%5 = fadd float %3, %4
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%6 = insertvalue { float, float } undef, float %2, 0
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%7 = insertvalue { float, float } %6, float %5, 1
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ret { float, float } %7
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}
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; Function Attrs: nounwind
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define hidden void @main.foo(%main.kv* dereferenceable_or_null(4) %a, i8* %context, i8* %parentHandle) unnamed_addr #0 {
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entry:
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call void @"main.foo$1"(%main.kv.0* null, i8* undef, i8* undef)
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ret void
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}
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; Function Attrs: nounwind
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define hidden void @"main.foo$1"(%main.kv.0* dereferenceable_or_null(1) %b, i8* %context, i8* %parentHandle) unnamed_addr #0 {
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entry:
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ret void
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}
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attributes #0 = { nounwind }
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