65 lines
1.8 KiB
LLVM
65 lines
1.8 KiB
LLVM
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt < %s -instsimplify -S | FileCheck %s
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; Overflow on a float to int or int to float conversion is undefined (PR21130).
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define i8 @overflow_fptosi() {
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; CHECK-LABEL: @overflow_fptosi(
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; CHECK-NEXT: ret i8 undef
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;
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%i = fptosi double 1.56e+02 to i8
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ret i8 %i
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}
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define i8 @overflow_fptoui() {
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; CHECK-LABEL: @overflow_fptoui(
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; CHECK-NEXT: ret i8 undef
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;
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%i = fptoui double 2.56e+02 to i8
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ret i8 %i
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}
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; The maximum float is approximately 2 ** 128 which is 3.4E38.
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; The constant below is 4E38. Use a 130 bit integer to hold that
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; number; 129-bits for the value + 1 bit for the sign.
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define float @overflow_uitofp() {
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; CHECK-LABEL: @overflow_uitofp(
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; CHECK-NEXT: ret float 0x7FF0000000000000
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;
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%i = uitofp i130 400000000000000000000000000000000000000 to float
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ret float %i
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}
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define float @overflow_sitofp() {
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; CHECK-LABEL: @overflow_sitofp(
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; CHECK-NEXT: ret float 0x7FF0000000000000
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;
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%i = sitofp i130 400000000000000000000000000000000000000 to float
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ret float %i
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}
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; https://llvm.org/PR43907 - make sure that NaN doesn't morph into Inf.
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; SNaN becomes QNaN.
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define float @nan_f64_trunc() {
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; CHECK-LABEL: @nan_f64_trunc(
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; CHECK-NEXT: ret float 0x7FF8000000000000
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;
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%f = fptrunc double 0x7FF0000000000001 to float
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ret float %f
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}
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; Verify again with a vector and different destination type.
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; SNaN becomes SNaN (first two elements).
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; QNaN remains QNaN (third element).
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; Lower 42 bits of NaN source payload are lost.
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define <3 x half> @nan_v3f64_trunc() {
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; CHECK-LABEL: @nan_v3f64_trunc(
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; CHECK-NEXT: ret <3 x half> <half 0xH7E00, half 0xH7E00, half 0xH7E00>
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;
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%f = fptrunc <3 x double> <double 0x7FF0020000000000, double 0x7FF003FFFFFFFFFF, double 0x7FF8000000000001> to <3 x half>
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ret <3 x half> %f
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}
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