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9a8d6a6c92
This is a preparatory step for D34515. This change: - makes nodes ISD::ADDCARRY and ISD::SUBCARRY legal for i32 - lowering is done by first converting the boolean value into the carry flag using (_, C) ← (ARMISD::ADDC R, -1) and converted back to an integer value using (R, _) ← (ARMISD::ADDE 0, 0, C). An ARMISD::ADDE between the two operations does the actual addition. - for subtraction, given that ISD::SUBCARRY second result is actually a borrow, we need to invert the value of the second operand and result before and after using ARMISD::SUBE. We need to invert the carry result of ARMISD::SUBE to preserve the semantics. - given that the generic combiner may lower ISD::ADDCARRY and ISD::SUBCARRYinto ISD::UADDO and ISD::USUBO we need to update their lowering as well otherwise i64 operations now would require branches. This implies updating the corresponding test for unsigned. - add new combiner to remove the redundant conversions from/to carry flags to/from boolean values (ARMISD::ADDC (ARMISD::ADDE 0, 0, C), -1) → C - fixes PR34045 - fixes PR34564 - fixes PR35103 Differential Revision: https://reviews.llvm.org/D35192 llvm-svn: 320355
26 lines
934 B
LLVM
26 lines
934 B
LLVM
; RUN: llc < %s -mtriple thumbv7 | FileCheck %s
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define hidden void @foo(i32* %ptr, i1 zeroext %long_blocks) {
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entry:
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; This test is actually checking that no cycle is introduced but at least we
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; want to see one umull.
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; CHECK: umull
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%0 = load i32, i32* %ptr, align 4
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%conv.i.i13.i = zext i32 %0 to i64
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%mul.i.i14.i = mul nuw nsw i64 %conv.i.i13.i, 18782
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%1 = load i32, i32* undef, align 4
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%conv4.i.i16.i = zext i32 %1 to i64
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%add5.i.i17.i = add nuw nsw i64 %mul.i.i14.i, %conv4.i.i16.i
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%shr.i.i18.i = lshr i64 %add5.i.i17.i, 32
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%add10.i.i20.i = add nuw nsw i64 %shr.i.i18.i, %add5.i.i17.i
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%conv11.i.i21.i = trunc i64 %add10.i.i20.i to i32
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%x.0.neg.i.i26.i = sub i32 -2, %conv11.i.i21.i
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%sub.i.i27.i = add i32 %x.0.neg.i.i26.i, 0
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store i32 %sub.i.i27.i, i32* %ptr, align 4
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br label %while.body.i
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while.body.i: ; preds = %while.body.i, %entry
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br label %while.body.i
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}
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