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11820d639d
It should be emitted when any floating-point operations (including
calls) are present in the object, not just when calls to printf/scanf
with floating point args are made.
The difference caused by this is very subtle: in static (/MT) builds,
on x86-32, in a program that uses floating point but doesn't print it,
the default x87 rounding mode may not be set properly upon
initialization.
This commit also removes the walk of the types pointed to by pointer
arguments in calls. (To assist in opaque pointer types migration --
eventually the pointee type won't be available.)
That latter implies that it will no longer consider a call like
`scanf("%f", &floatvar)` as sufficient to emit _fltused on its
own. And without _fltused, `scanf("%f")` will abort with error R6002. This
new behavior is unlikely to bite anyone in practice (you'd have to
read a float, and do nothing with it!), and also, is consistent with
MSVC.
Differential Revision: https://reviews.llvm.org/D56548
llvm-svn: 352076
21 lines
779 B
LLVM
21 lines
779 B
LLVM
; The purpose of this test to verify that the fltused symbol is
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; emitted when a floating point call is made on Windows.
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; RUN: llc < %s -mtriple i686-pc-win32 | FileCheck %s --check-prefix WIN32
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; RUN: llc < %s -mtriple x86_64-pc-win32 | FileCheck %s --check-prefix WIN64
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; RUN: llc < %s -O0 -mtriple i686-pc-win32 | FileCheck %s --check-prefix WIN32
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; RUN: llc < %s -O0 -mtriple x86_64-pc-win32 | FileCheck %s --check-prefix WIN64
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@.str = private constant [4 x i8] c"%f\0A\00"
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define i32 @main() nounwind {
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entry:
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%call = tail call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i32 0, i32 0), double 1.000000e+000) nounwind
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ret i32 0
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}
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declare i32 @printf(i8* nocapture, ...) nounwind
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; WIN32: .globl __fltused
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; WIN64: .globl _fltused
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