116ab78694
The register R1 is defined to have the constant value 0 in the avr-gcc calling convention (which we follow). Unfortunately, we don't really make use of it. This patch replaces `LDI 0` instructions with a copy from R1. This reduces code size: my AVR build of compiler-rt goes from 50660 to 50240 bytes of code size, which is a 0.8% reduction. Presumably it will also improve execution speed, although I didn't measure this. Differential Revision: https://reviews.llvm.org/D117425
13 lines
251 B
LLVM
13 lines
251 B
LLVM
; RUN: llc < %s -march=avr | FileCheck %s
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; This test checks that we can successfully lower a store
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; to an undefined pointer.
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; CHECK-LABEL: foo
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define void @foo() {
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; CHECK: st [[PTRREG:X|Y|Z]], r1
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store i8 0, i8* undef, align 4
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ret void
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}
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