http://llvm.org/bugs/show_bug.cgi?id=21594
Bug ID: 21594
Summary: [AArch64][FastISel] Generates invalid shift immediate
greater than 31 (lsr w10, w8, #32)
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: ASSIGNED
Severity: normal
Priority: P
Component: Backend: AArch64
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected],
[email protected], [email protected]
Classification: Unclassified
When running with fast-isel the assembler is complaining about an invalid
immediate value on a shift instruction:
Error: immediate value out of range 0 to 31 at operand 3 -- `lsr w10,w10,#32'
Reduced test case:
--------------------------------------------------
$> more test.ll
; ModuleID = 'test.ll'
target datalayout = "e-m:e-i64:64-i128:128-n32:64-S128"
target triple = "aarch64--linux-gnu"
%struct.element_t = type { i32 }
@list = internal constant [0 x %struct.element_t] zeroinitializer, align 4
define internal i32* @tink() {
entry:
%call = call i32 bitcast (i32 (...)* @foo to i32 ()*)()
%tobool = icmp ne i32 %call, 0
br i1 %tobool, label %lor.lhs.false, label %if.then
lor.lhs.false: ; preds = %entry
%mul = mul nsw i32 1, undef
%idx.ext = sext i32 %mul to i64
%add.ptr = getelementptr inbounds i8* undef, i64 %idx.ext
%call1 = call i32 bitcast (i32 (...)* @foo to i32 (i8*, i32)*)(i8* %add.ptr,
i32 undef)
%tobool2 = icmp ne i32 %call1, 0
br i1 %tobool2, label %lor.lhs.false3, label %if.then
lor.lhs.false3: ; preds = %lor.lhs.false
%mul4 = mul nsw i32 2, undef
%idx.ext5 = sext i32 %mul4 to i64
%add.ptr6 = getelementptr inbounds i8* undef, i64 %idx.ext5
%call7 = call i32 bitcast (i32 (...)* @foo to i32 (i8*, i32)*)(i8* %add.ptr6,
i32 undef)
%tobool8 = icmp ne i32 %call7, 0
br i1 %tobool8, label %if.end, label %if.then
if.then: ; preds = %lor.lhs.false3,
%lor.lhs.false, %entry
br label %if.end
if.end: ; preds = %if.then,
%lor.lhs.false3
ret i32* undef
}
declare i32 @foo(...)
--------------------------------------------------
Reproduce with:
$> llc -O0 test.ll -o - | grep lsr
lsr w10, w8, #32
The regression looks to have been introduced around 08/27-08/28.
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