https://llvm.org/bugs/show_bug.cgi?id=26356
Bug ID: 26356
Summary: PowerPC64: fast isel creates bad constant
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: Backend: PowerPC
Assignee: unassignedb...@nondot.org
Reporter: an...@samba.org
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
The following testcase:
target datalayout = "e-m:e-i64:64-n32:64"
target triple = "powerpc64le-unknown-linux-gnu"
; Function Attrs: nounwind
define internal zeroext i16 @zot() #0 {
ret i16 32768
}
Creates an incorrect negative constant when built with -fast-isel:
# llc -O1 -fast-isel x.ll
...
zot:
li 3, -32768
blr
Without -fast-isel, we get the correct unsigned constant:
# llc -O1 x.ll
...
zot:
li 3, 0
ori 3, 3, 32768
blr
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