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[ARM64] Fix immediate cost calculation for types larger than i64.

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The immediate cost calculation code was hitting an assertion in the included
test case, because APInt was still internally 128-bits. Truncating it to 64-bits
fixed the issue.

Fixes <rdar://problem/16572521>.

llvm-svn: 205947
This commit is contained in:
Juergen Ributzka 2014-04-10 01:36:59 +00:00
parent 52c8f727f3
commit c19a8638e5
2 changed files with 11 additions and 1 deletions
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2
lib/Target/ARM64/ARM64TargetTransformInfo.cpp
View File

@ -166,7 +166,7 @@ unsigned ARM64TTI::getIntImmCost(const APInt &Imm, Type *Ty) const {
// chunk.
unsigned Cost = 0;
for (unsigned ShiftVal = 0; ShiftVal < BitSize; ShiftVal += 64) {
APInt Tmp = ImmVal.ashr(ShiftVal).getLoBits(64);
APInt Tmp = ImmVal.ashr(ShiftVal).sextOrTrunc(64);
int64_t Val = Tmp.getSExtValue();
Cost += getIntImmCost(Val);
}

10
test/Transforms/ConstantHoisting/ARM64/large-immediate.ll Normal file
View File

@ -0,0 +1,10 @@
; RUN: opt -mtriple=arm64-darwin-unknown -S -consthoist < %s | FileCheck %s
define i128 @test1(i128 %a) nounwind {
; CHECK-LABEL: test1
; CHECK: %const = bitcast i128 12297829382473034410122878 to i128
%1 = add i128 %a, 12297829382473034410122878
%2 = add i128 %1, 12297829382473034410122878
ret i128 %2
}