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e777fb4725
Summary: They behave in accordance with the Has2008 and ABS2008 configuration bits of the processor which are used to select between the 1985 and 2008 versions of IEEE 754. In 1985 mode, these instructions are arithmetic (i.e. they raise invalid operation exceptions when given NaN), in 2008 mode they are non-arithmetic (i.e. they are copies). nmadd.[ds], and nmsub.[ds] are still subject to -enable-no-nans-fp-math because the ISA spec does not explicitly state that they obey Has2008 and ABS2008. Fixed the issue with the previous version of this patch (r205628). A pre-existing 'let Predicate =' statement was removing some predicates that were necessary for FP64 to behave correctly. Reviewers: matheusalmeida Reviewed By: matheusalmeida Differential Revision: http://llvm-reviews.chandlerc.com/D3274 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@205844 91177308-0d34-0410-b5e6-96231b3b80d8
39 lines
1.3 KiB
LLVM
39 lines
1.3 KiB
LLVM
; Check that abs.[ds] is selected and does not depend on -enable-no-nans-fp-math
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; They obey the Has2008 and ABS2008 configuration bits which govern the
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; conformance to IEEE 754 (1985) and IEEE 754 (2008). When these bits are not
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; present, they confirm to 1985.
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; In 1985 mode, abs.[ds] are arithmetic (i.e. they raise invalid operation
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; exceptions when given NaN's). In 2008 mode, they are non-arithmetic (i.e.
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; they are copies and don't raise any exceptions).
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; RUN: llc < %s -mtriple=mipsel-linux-gnu -mcpu=mips32 | FileCheck %s
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; RUN: llc < %s -mtriple=mipsel-linux-gnu -mcpu=mips32r2 | FileCheck %s
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; RUN: llc < %s -mtriple=mipsel-linux-gnu -mcpu=mips32 -enable-no-nans-fp-math | FileCheck %s
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; RUN: llc < %s -mtriple=mips64el-linux-gnu -mcpu=mips64 | FileCheck %s
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; RUN: llc < %s -mtriple=mips64el-linux-gnu -mcpu=mips64 -enable-no-nans-fp-math | FileCheck %s
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define float @foo0(float %a) nounwind readnone {
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entry:
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; CHECK-LABEL: foo0
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; CHECK: abs.s
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%call = tail call float @fabsf(float %a) nounwind readnone
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ret float %call
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}
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declare float @fabsf(float) nounwind readnone
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define double @foo1(double %a) nounwind readnone {
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entry:
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; CHECK-LABEL: foo1:
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; CHECK: abs.d
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%call = tail call double @fabs(double %a) nounwind readnone
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ret double %call
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}
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declare double @fabs(double) nounwind readnone
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