284472be6d
We don't have FP exception limits in the IR constant folder for the binops (apart from strict ops), so it does not make sense to have them here in the DAG either. Nothing else in the backend tries to preserve exceptions (again outside of strict ops), so I don't see how this could have ever worked for real code that cares about FP exceptions. There are still cases (examples: unary opcodes in SDAG, FMA in IR) where we are trying (at least partially) to preserve exceptions without even asking if the target supports FP exceptions. Those should be corrected in subsequent patches. Real support for FP exceptions requires several changes to handle the constrained/strict FP ops. Differential Revision: https://reviews.llvm.org/D61331 llvm-svn: 359791
77 lines
2.0 KiB
LLVM
77 lines
2.0 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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; RUN: llc < %s -mtriple=aarch64-- | FileCheck %s
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; https://bugs.llvm.org/show_bug.cgi?id=41668
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define double @constant_fold_fdiv_by_zero(double* %p) {
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; CHECK-LABEL: constant_fold_fdiv_by_zero:
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; CHECK: // %bb.0:
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; CHECK-NEXT: mov x8, #9218868437227405312
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; CHECK-NEXT: fmov d0, x8
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; CHECK-NEXT: ret
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%r = fdiv double 4.940660e-324, 0.0
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ret double %r
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}
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; frem by 0.0 --> NaN
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define double @constant_fold_frem_by_zero(double* %p) {
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; CHECK-LABEL: constant_fold_frem_by_zero:
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; CHECK: // %bb.0:
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; CHECK-NEXT: mov x8, #9221120237041090560
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; CHECK-NEXT: fmov d0, x8
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; CHECK-NEXT: ret
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%r = frem double 4.940660e-324, 0.0
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ret double %r
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}
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; Inf * 0.0 --> NaN
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define double @constant_fold_fmul_nan(double* %p) {
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; CHECK-LABEL: constant_fold_fmul_nan:
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; CHECK: // %bb.0:
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; CHECK-NEXT: mov x8, #9221120237041090560
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; CHECK-NEXT: fmov d0, x8
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; CHECK-NEXT: ret
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%r = fmul double 0x7ff0000000000000, 0.0
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ret double %r
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}
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; Inf + -Inf --> NaN
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define double @constant_fold_fadd_nan(double* %p) {
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; CHECK-LABEL: constant_fold_fadd_nan:
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; CHECK: // %bb.0:
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; CHECK-NEXT: mov x8, #9221120237041090560
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; CHECK-NEXT: fmov d0, x8
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; CHECK-NEXT: ret
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%r = fadd double 0x7ff0000000000000, 0xfff0000000000000
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ret double %r
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}
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; Inf - Inf --> NaN
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define double @constant_fold_fsub_nan(double* %p) {
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; CHECK-LABEL: constant_fold_fsub_nan:
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; CHECK: // %bb.0:
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; CHECK-NEXT: mov x8, #9221120237041090560
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; CHECK-NEXT: fmov d0, x8
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; CHECK-NEXT: ret
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%r = fsub double 0x7ff0000000000000, 0x7ff0000000000000
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ret double %r
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}
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; Inf * 0.0 + ? --> NaN
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define double @constant_fold_fma_nan(double* %p) {
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; CHECK-LABEL: constant_fold_fma_nan:
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; CHECK: // %bb.0:
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; CHECK-NEXT: mov x8, #9221120237041090560
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; CHECK-NEXT: fmov d0, x8
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; CHECK-NEXT: ret
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%r = call double @llvm.fma.f64(double 0x7ff0000000000000, double 0.0, double 42.0)
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ret double %r
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}
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declare double @llvm.fma.f64(double, double, double)
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