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compiler: mark all GEPs as inbounds

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In Go, it is not possible to construct pointers that are out of bounds
(and not null), so let LLVM know about this fact.

This leads to a significant code size reduction, around 3% in many
cases.
This commit is contained in:
Ayke van Laethem
2019-04-25 11:21:14 +02:00
committed by Ron Evans
parent d155e31b64
commit 9a3d0683b3
3 changed files with 21 additions and 17 deletions
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compiler/goroutine-lowering.go
+3 -3
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@@ -485,7 +485,7 @@ func (c *Compiler) markAsyncFunctions() (needsScheduler bool, err error) {
llvm.ConstInt(c.ctx.Int1Type(), 0, false),
}, "task.promise.raw")
promise := c.builder.CreateBitCast(promiseRaw, llvm.PointerType(promiseType, 0), "task.promise")
dataPtr := c.builder.CreateGEP(promise, []llvm.Value{
dataPtr := c.builder.CreateInBoundsGEP(promise, []llvm.Value{
llvm.ConstInt(c.ctx.Int32Type(), 0, false),
llvm.ConstInt(c.ctx.Int32Type(), 2, false),
}, "task.promise.data")
@@ -546,13 +546,13 @@ func (c *Compiler) markAsyncFunctions() (needsScheduler bool, err error) {
llvm.ConstInt(c.ctx.Int1Type(), 0, false),
}, "task.promise.raw")
promise := c.builder.CreateBitCast(promiseRaw, llvm.PointerType(promiseType, 0), "task.promise")
dataPtr := c.builder.CreateGEP(promise, []llvm.Value{
dataPtr := c.builder.CreateInBoundsGEP(promise, []llvm.Value{
llvm.ConstInt(c.ctx.Int32Type(), 0, false),
llvm.ConstInt(c.ctx.Int32Type(), 2, false),
}, "task.promise.data")
valueAlloca.ReplaceAllUsesWith(c.builder.CreateBitCast(dataPtr, valueAlloca.Type(), ""))
valueAlloca.EraseFromParentAsInstruction()
commaOkPtr := c.builder.CreateGEP(promise, []llvm.Value{
commaOkPtr := c.builder.CreateInBoundsGEP(promise, []llvm.Value{
llvm.ConstInt(c.ctx.Int32Type(), 0, false),
llvm.ConstInt(c.ctx.Int32Type(), 1, false),
}, "task.promise.comma-ok")