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Thanks to sabre for pointing out that we were incorrectly codegen'ing

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int test(int x) { return 32768 - x; }

Fixed by teaching the function that checks a constant's validity to be used
as an immediate argument about subtract-from instructions.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@17476 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nate Begeman 2004-11-04 19:43:18 +00:00
parent 3c7d7ee761
commit 28dd2fc240
1 changed files with 4 additions and 1 deletions
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5
lib/Target/PowerPC/PPC32ISelSimple.cpp
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@ -536,8 +536,11 @@ bool PPC32ISel::canUseAsImmediateForOpcode(ConstantInt *CI, unsigned Opcode,
else
return false;
}
// Treat subfic like addi for the purposes of constant validation
if (Opcode == 5) Opcode = 0;
// ADDI, Compare, and non-indexed Load take SIMM
// addi, subfic, compare, and non-indexed load take SIMM
bool cond1 = (Opcode < 2)
&& ((int32_t)CI->getRawValue() <= 32767)
&& ((int32_t)CI->getRawValue() >= -32768);