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compiler,runtime: translate memzero calls to LLVM memset intrinsics

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This gives the optimizer a bit more information about what the calls do.
This should result in slightly better generated code.

Code size sometimes goes up and sometimes goes down. I blame the code
size going up on the inliner which inlines more functions, because
compiling the smoke tests in the drivers repository with -opt=1 results
in a slight code size reduction in all cases.
This commit is contained in:
Ayke van Laethem
2020-03-26 16:09:48 +01:00
committed by Ron Evans
parent eaa54bc7e3
commit 91d1a23b14
3 changed files with 25 additions and 5 deletions
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compiler/compiler.go
+2
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@@ -1343,6 +1343,8 @@ func (b *builder) createFunctionCall(instr *ssa.CallCommon) (llvm.Value, error)
switch {
case name == "runtime.memcpy" || name == "runtime.memmove" || name == "reflect.memcpy":
return b.createMemoryCopyCall(fn, instr.Args)
case name == "runtime.memzero":
return b.createMemoryZeroCall(instr.Args)
case name == "device/arm.ReadRegister" || name == "device/riscv.ReadRegister":
return b.createReadRegister(name, instr.Args)
case name == "device/arm.Asm" || name == "device/avr.Asm" || name == "device/riscv.Asm":