https://llvm.org/bugs/show_bug.cgi?id=23405
Bug ID: 23405
Summary: CodeGen crash with "Physical register dependency
violated?"
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: Backend: X86
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
The CodeGen crashes during instruction scheduling / backtracking. It is quite
similar to https://llvm.org/bugs/show_bug.cgi?id=22304 (already fixed).
Test case:
define i64 @test(i64 %a, i256 %b, i1 %c) {
%u = zext i64 %a to i256
%s = add i256 %u, 1
%o = trunc i256 %s to i1
%j = add i256 %s, 1
%i = icmp ule i64 %a, 1
%f = select i1 %o, i256 undef, i256 %j
%d = select i1 %i, i256 %f, i256 1
%e = add i256 %b, 1
%n = select i1 %c, i256 %e, i256 %b
%m = trunc i256 %n to i64
%h = add i64 %m, 1
%r = zext i64 %h to i256
%v = lshr i256 %d, %r
%t = trunc i256 %v to i1
%q = shl i256 1, %r
%p = and i256 %d, %q
%w = icmp ule i256 %n, 1
%y = select i1 %t, i256 undef, i256 %p
%x = select i1 %w, i256 %y, i256 %d
%z = trunc i256 %x to i64
ret i64 %z
}
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