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compiler: simplify code around getZeroValue

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The LLVM library we use does not (yet) provide a llvm.Zero (like it
provides a llvm.Undef) so we have implemented our own. However, in
theory it might return an error in some cases.

No real-world errors have been seen in a while and errors would likely
indicate a serious compiler bug anyway (not an external error), so make
it panic instead of returning an error.
This commit is contained in:
Ayke van Laethem
2019-04-21 14:04:22 +02:00
committed by Ron Evans
parent 024eceb476
commit 6d23809218
5 changed files with 24 additions and 62 deletions
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compiler/optimizer.go
+1 -1
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@@ -272,7 +272,7 @@ func (c *Compiler) OptimizeAllocs() {
sizeInWords := (size + uint64(alignment) - 1) / uint64(alignment)
allocaType := llvm.ArrayType(c.ctx.IntType(alignment*8), int(sizeInWords))
alloca := c.builder.CreateAlloca(allocaType, "stackalloc.alloca")
zero, _ := c.getZeroValue(alloca.Type().ElementType())
zero := c.getZeroValue(alloca.Type().ElementType())
c.builder.CreateStore(zero, alloca)
stackalloc := c.builder.CreateBitCast(alloca, bitcast.Type(), "stackalloc")
bitcast.ReplaceAllUsesWith(stackalloc)