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https://github.com/c64scene-ar/llvm-6502.git
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117bf240ef
The integer extend optimization tries to fold the extend into the load instruction. This requires us to identify if the extend has already been emitted or not and act accordingly on it. The check that was originally performed for this was not sufficient. Besides checking the ValueMap for a mapped register we also need to check if the virtual register has already an associated machine instruction that defines it. This fixes rdar://problem/20470788. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@234529 91177308-0d34-0410-b5e6-96231b3b80d8
20 lines
414 B
LLVM
20 lines
414 B
LLVM
; RUN: llc -mtriple=aarch64-apple-darwin -O0 -fast-isel -fast-isel-abort=1 -verify-machineinstrs < %s | FileCheck %s
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; CHECK-LABEL: int_ext_opt
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define i64 @int_ext_opt(i8* %addr, i1 %c1, i1 %c2) {
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entry:
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%0 = load i8, i8* %addr
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br i1 %c1, label %bb1, label %bb2
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bb1:
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%1 = zext i8 %0 to i64
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br i1 %c2, label %bb2, label %exit
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bb2:
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%2 = phi i64 [1, %entry], [%1, %bb1]
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ret i64 %2
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exit:
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ret i64 0
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}
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