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7ed3f1b26c
IEEE 754 defines the expected result on overflow. As far as I know, hardware implementations (of f16), and compiler-rt (__floatuntisf) correctly return +-Inf on overflow. And I can't think of any useful transform that would take advantage of overflow being undefined here. Differential Revision: https://reviews.llvm.org/D47807 llvm-svn: 334777
41 lines
1007 B
LLVM
41 lines
1007 B
LLVM
; RUN: opt < %s -constprop -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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