| Issue |
56461
|
| Summary |
LLVM 14 Regression: Bad `fptoui` result when targeting `x86_64-windows-gnu`
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
topolarity
|
Bad float to int conversion when targeting `x86_64-windows-gnu`:
```llvm
; ModuleID = 'test'
source_filename = "test"
target datalayout = "e-m:w-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-windows-gnu"
; Function Attrs: nobuiltin nounwind uwtable
define external fastcc i16 @"wWinMainCRTStartup"() unnamed_addr #1 {
Entry:
%x = alloca double, align 8
store double 152314000000000000407048814592.0, double* %x, align 8
%0 = load double, double* %x, align 8
%1 = fptoui double %0 to i128
%2 = icmp ne i128 %1, 152314000000000000407048814592
%3 = zext i1 %2 to i32
call void @ExitProcess(i32 %3)
unreachable
}
; Function Attrs: nobuiltin noreturn nounwind uwtable
declare void @ExitProcess(i32 %0) #2
```
This exits with 0 in LLVM 13.0.1, but returns 1 with LLVM 14.0.5 and trunk.
(Note that `152314000000000000407048814592` is exactly representable in both `f64` and `u128`)
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