From 28dd2fc240749d77d4251b4a29b8cace2a65460c Mon Sep 17 00:00:00 2001 From: Nate Begeman Date: Thu, 4 Nov 2004 19:43:18 +0000 Subject: [PATCH] Thanks to sabre for pointing out that we were incorrectly codegen'ing 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 --- lib/Target/PowerPC/PPC32ISelSimple.cpp | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/lib/Target/PowerPC/PPC32ISelSimple.cpp b/lib/Target/PowerPC/PPC32ISelSimple.cpp index d0406c7e402..5314dada04a 100644 --- a/lib/Target/PowerPC/PPC32ISelSimple.cpp +++ b/lib/Target/PowerPC/PPC32ISelSimple.cpp @@ -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);